135 results on '"efficiency optimization"'
Search Results
2. Control of a Wind Turbine Working in the Intermediate Velocity Zone: A Model Free Discrete Time Approach.
- Author
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Corradini, Maria Letizia, Ippoliti, Gianluca, and Orlando, Giuseppe
- Abstract
In this paper, a novel data-driven control algorithm based on model-free adaptive control is presented, addressing general discrete-time single-input single-output nonlinear systems, approximated by an equivalent dynamic linearization model using pseudo-partial derivatives. The closed loop stability is proved, showing that the tracking error asymptotically vanishes. Moreover, the proposed approach has been applied to a 5 MW wind turbine, considering as control target the efficiency optimization issue when the turbine operates under medium wind speed conditions. Validation of the technique has been performed, testing the overall control system by simulation using the tool FAST developed by the National Renewable Energy Laboratory (NREL). [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
3. Study on the Coil Position Adaptive Adjustment Control Scheme of Wireless Power Transfer System.
- Author
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Gao, Pengfei, Wang, Peiyi, Tian, Xiaoying, and Huang, Xiaoyan
- Subjects
- *
WIRELESS power transmission , *ADAPTIVE control systems , *STAIR climbing , *POWER resources , *ELECTRICAL engineers , *DYNAMICAL systems - Abstract
Wireless power transfer (WPT) technology can completely isolate the equipment from the power supply, and has been widely used. However, the transmission efficiency of WPT system is optimal only as the transmitting coil was completely aligned with the receiving coil. But in practical applications, the mobile devices are all dynamic system, and perfectly alignment of the coils is a very demanding condition. In order to solve this problem, the paper proposed a coil position adaptive adjustment control scheme of WPT system with lateral misalignment or angular misalignment. Firstly, the relationship between transmission efficiency and lateral misalignment and angular misalignment was analyzed. And the research results show that if there is a lateral misalignment between the coils, the transmission efficiency can be optimized by adjusting the angular misalignment. Secondly, based on the hill climbing algorithm, a coil position adaptive adjustment control method was proposed. Finally, a coil position adaptive adjustment WPT system experimental platform was built, and the experimental researches are carried on. The results of the experiment show that as the transfer distance is 0.10 m and the lateral misalignment is 0.12 m, the transfer efficiency can be increased from 38.38% to 55.61% through the proposed control scheme. And the results verify the feasibility and effectiveness of control scheme proposed in the paper. © 2024 Institute of Electrical Engineers of Japan and Wiley Periodicals LLC. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
4. 精细能谱的在线能群归并方法研究.
- Author
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周欣宇, 饶俊杰, 张宏博, 赵 晨, 赵文博, 王连杰, and 陈 长
- Subjects
NEUTRON flux ,ELASTIC scattering ,NUCLEAR reactor cores ,FAST neutrons ,NEUTRON temperature ,FAST reactors - Abstract
Copyright of Atomic Energy Science & Technology is the property of Editorial Board of Atomic Energy Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2024
- Full Text
- View/download PDF
5. Research on Online Energy Group Condensation Method for Fine Group Energy Spectrum
- Author
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ZHOU Xinyu, RAO Junjie, ZHANG Hongbo, ZHAO Chen, ZHAO Wenbo, WANG Lianjie, CHEN Zhang
- Subjects
fine group energy spectrum ,online energy group condensation ,deterministic one-step method ,efficiency optimization ,shark ,Nuclear engineering. Atomic power ,TK9001-9401 ,Nuclear and particle physics. Atomic energy. Radioactivity ,QC770-798 - Abstract
Because the elastic scattering cross sections of medium-mass nuclides have very strong elastic scattering resonance phenomenon in the fast neutron region, which will lead to the self-shielding effect of energy scale and make distortions of the neutron flux distribution to zigzagging. In order to accurately describe the distribution of neutron flux in the energy scale, the deterministic one-step method needs to divide a large number of energy intervals for description, and the number of energy groups is generally thousands. Deterministic one-step transport calculation has large memory and low computational efficiency with thousands of groups. In the traditional calculation of the whole-core non-uniform transport calculation for the thousands of groups, the section generation software was mainly used to prepare the self-shielding cross section by using the ultra-fine groups, and then the broad-group cross section was prepared offline by the transport calculation of the equivalent model of cells or components. Finally, the deterministic one-step program was used to calculate the whole-core non-uniform transport. The broad-group cross sections prepared off-line cannot reflect the characteristics of materials of different reactor locations and bring the approximations. In order to solve the problem that the thousand-group energy structure of fast reactors leads to the high computational cost of the deterministic one-step method, an online energy group condensation method with fine group energy spectrum based on SHARK was developed. For the fuel cells of fast reactors, it can keep the composition of fuel and other materials unchanged and search the radius of the fuel to make the escape cross section conserved. It has the capability of online equivalent model establishment, online calculation of fine group energy spectrum and broad group cross sections condensation. For non-fuel cells, the broad group cross section was condensed using the fine group energy spectrum calculated by the one-dimensionalal constant volume model of practical problems. Based on the MOX1000 material of the benchmark for neutronic analysis of sodium-cooled fast reactor cores, a two-dimensional 5×5 rectangular single-assembly problem and a two-dimensional 3×3 multi-assembly problem were constructed and calculated. The numerical results show that compared with the calculation results of the group in 1 968, the acceleration ratio of the online energy group condensation method in the two-dimensional 5×5 rectangular single-assembly problem is 8 to 18 and that in the two-dimensional 3×3 multi-assembly problem is 12 to 17, which can significantly improve the calculation efficiency. In terms of calculation accuracy, the relative deviation of pin power distribution is less than 1%, and the maximum deviation of eigenvalue is about 360 pcm. It is of great significance to deterministic one-step method for fast reactor transport calculation.
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- 2024
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6. Efficiency Optimization of the Gear Reducer of an Overhead Power Line Inspection Robot
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de Souza, Marina Baldissera, Fernandes, Gustavo Queiroz, Laus, Luís Paulo, Carboni, Andrea Piga, Martins, Daniel, Kacprzyk, Janusz, Series Editor, Gomide, Fernando, Advisory Editor, Kaynak, Okyay, Advisory Editor, Liu, Derong, Advisory Editor, Pedrycz, Witold, Advisory Editor, Polycarpou, Marios M., Advisory Editor, Rudas, Imre J., Advisory Editor, Wang, Jun, Advisory Editor, Youssef, Ebrahim Samer El, editor, Tokhi, Mohammad Osman, editor, Silva, Manuel F., editor, and Rincon, Leonardo Mejia, editor
- Published
- 2024
- Full Text
- View/download PDF
7. Investigation and Optimization of a Twin-Screw Compressor with Internal Cooling Channels
- Author
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Saravana, Abhignan, Liu, Haotian, Able, Nick, Collins, James, Groll, Eckhard A., Ziviani, Davide, Rashid, Muhammad H., Series Editor, Kolhe, Mohan Lal, Series Editor, Read, Matthew, editor, Rane, Sham, editor, Ivkovic-Kihic, Ivona, editor, and Kovacevic, Ahmed, editor
- Published
- 2024
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- View/download PDF
8. A Loss-Model-Based Efficiency Optimization Control Method for Induction Traction System of High-Speed Train Under Emergency Self-Propelled Mode
- Author
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Yutong Zhu and Yaohua Li
- Subjects
efficiency optimization ,induction motor ,loss model control ,motor drives ,traction system ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 - Abstract
Increasing attention has been paid to the efficiency improvement of the induction traction system of high-speed trains due to the high demand for energy saving. In emergency self-propelled mode, however, the dc-link voltage and the traction power of the motor are significantly reduced, resulting in decreased traction efficiency due to the low load and low speed operations. Aiming to tackle this problem, a novel efficiency improved control method is introduced to the emergency mode of high-speed train traction system in this paper. In the proposed method, a total loss model of induction motor considering the behaviors of both iron and copper loss is established. An improved iterative algorithm with decreased computational burden is then introduced, resulting in a fast solving of the optimal flux reference for loss minimization at each control period. In addition, considering the parameter variation problem due to the low load and low speed operations, a parameter estimation method is integrated to improve the controller's robustness. The effectiveness of the proposed method on efficiency improvement at low voltage and low load conditions is demonstrated by simulated and experimental results.
- Published
- 2024
- Full Text
- View/download PDF
9. Contactless Traction Power Supply System Design and Efficiency Optimization of Battery Energy Storage Rail Trains
- Author
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Peng YANG, Meizheng LI, Jingdong CHEN, Yupeng TIAN, and Dongyi LI
- Subjects
rail train ,contactless power supply ,traction power supply ,efficiency optimization ,Transportation engineering ,TA1001-1280 - Abstract
Objective Contactless power supply method, leveraging the advantages of no direct electrical contact between the primary and secondary side coils, is currently being explored in the rail transit industry. The high-power, high-frequency application scenarios pose challenges in the design of the contactless traction power supply system, component selection, and coupling mechanism design. It requires optimization of the design scheme and system efficiency. Method For rail transit application scenarios, the system structure of a contactless traction power supply system based on the LCC-S (inductance-capacitor-capacitor-series) compensation topology is introduced. A 250 kW contactless power supply system is designed, utilizing double D-shaped coils for the primary track coils and secondary receiving coils. The impact of factors such as mutual inductance of coupling coils and losses in magnetic materials on system efficiency is studied. System circuit model and coupling coil model are established. The system is simulated based on the model, and parameters for the magnetic core thickness in different regions of the secondary coils are optimized. An experimental platform for contactless traction power supply system is built, and tests are conducted at a power level of 250 kW to validate the effectiveness of the design optimization method. Result & Conclusion The simulation and experimental results confirm the effectiveness and feasibility of the design optimization method. Optimization of the core layout ensures coil mutual inductance and reduces core losses. The system demonstrates the capability of delivering a rated output power of 250 kW. Under air gap heights of 70 mm and 80 mm, the static and dynamic operating efficiencies of the system are both greater than 90%.
- Published
- 2024
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- View/download PDF
10. Efficiency optimization for phase‐shifted full‐bridge converter with variable frequency control.
- Author
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Tang, Yu, Liu, Baozhu, Ji, Danning, jia, Guanlong, and Yao, Fang
- Subjects
- *
DC-to-DC converters , *VOLTAGE control , *POWER density - Abstract
In this paper, a control method combined with variable frequency and phase shifting is proposed, the primary purpose of which is to optimize the operating efficiency of the phase‐shift full‐bridge (PSFB) DC‐DC converter. By modeling the losses of the PSFB converter, the optimal switching frequency related to the load conditions is found. A neural network aided variable frequency controller that can work linearly is built to achieve the proposed method. At the same time, the voltage control loop is retained to ensure the stability of the output voltage and the necessary dynamic response of the converter. This paper builds an experimental platform for a 2 kW PSFB DC‐DC converter to verify the effectiveness of the proposed control method. With the control method proposed in this paper, the PSFB converter can always work at the optimum efficiency point under different load conditions. In addition, this paper also analyzes the influence of variable frequency control on PSFB operating states, such as zero‐voltage‐switching (ZVS) constraints, continuous conduction mode (CCM) operating states, and power density, which have an impact on its operating conditions. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
11. 基于变载波频率的永磁同步电机 驱动系统效率优化控制.
- Author
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刘凯, 张阔, 花为, and 胡铭觐
- Abstract
Copyright of Journal of Southeast University / Dongnan Daxue Xuebao is the property of Journal of Southeast University Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2024
- Full Text
- View/download PDF
12. 储能式轨道列车非接触牵引供电系统设计与效率优化.
- Author
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YANG Peng, LI Meizheng, CHEN Jingdong, TIAN Yupeng, and LI Dongyi
- Abstract
Copyright of Urban Mass Transit is the property of Urban Mass Transit Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2024
- Full Text
- View/download PDF
13. Efficiency Enhancement in Synchronous Reluctance Motors by Active Flux Adjustment Based on Robust Model-Based Approaches
- Author
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Seyed Rasul Eftekhari, Ali Mosallanejad, Hamidreza Pairo, and Jose Rodriguez
- Subjects
Efficiency optimization ,synchronous reluctance motor ,core loss resistance ,loss minimization ,real-time implementation ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 - Abstract
In pursuit of improving energy efficiency in the industry, this paper proposes two model-based loss-minimization techniques for synchronous reluctance motors (SynRM): the model-based loss-minimization robust method (MLR) and the simplified model-based loss-minimization robust method (SMLR). Both techniques belong to the broader category of model-based methods, which are known for their fast dynamic convergence, low torque ripple, and reduced computational load compared to search-based and hybrid methods. Results reveal that both MLR and SMLR exhibit appropriate performance against motor parameter variations, particularly in the components of stator inductance ( $L_{dq}$ ), while maintaining high efficiency and minimal power loss. The study paves the way for the integration of these techniques into control strategies that use active flux to further enhance the efficiency of SynRM in industrial applications. The paper presents a comprehensive and thorough sensitivity analysis, along with detailed experimental results, that effectively verify the proper and consistent performance of the proposed methods across various operating points.
- Published
- 2024
- Full Text
- View/download PDF
14. Modulation Techniques and Coordinated Voltage Vector Distribution: Effects on Efficiency in Dual-Inverter Topology-Based Electric Drives.
- Author
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Kucera, Jakub, Zakopal, Petr, Baum, Filip, and Lipcak, Ondrej
- Subjects
- *
ELECTRIC drives , *POWER electronics , *VECTOR spaces , *VOLTAGE , *PULSE width modulation transformers , *VOLTAGE references , *ELECTRIC inverters - Abstract
The increasing popularity of electric drives employing an isolated dual-inverter (DI) topology is motivated by their superior DC-link voltage and power utilization, fault-tolerant operation, and potential for multilevel operation. These attributes are significant in battery-powered transportation, such as electric vehicles and aviation. Given the considerable freedom in modulation and control of the DI topology, this paper researches the impact of reference voltage vector distribution between the two individual inverters. The study also evaluates the influence of two well-established asynchronous modulation strategies—Space Vector PWM (SVPWM) and Depenbrock's Discontinuous Modulation (DPWM1). Since simulation tools nowadays play a crucial role in power electronics design and concept verification, the results are based on extensive and detailed models in Matlab/Simulink. Employing the basic field-oriented control of a 12 kW induction motor with precisely parameterized SiC switching devices for accurate loss calculation, this research reveals the possibility of significant energy savings at multiple operating points. Notably, optimal efficiency is achieved when one inverter operates up to half of the nominal speed while the other solely establishes a neutral point for the winding. Moreover, the results highlight DPWM1 as a superior strategy for the DI topology, showcasing reduced converter losses. Overall, it is shown that the system's losses can be significantly reduced just by the design of the voltage vector distribution in the drive's operating range and the modulation strategy selection. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
15. Designing Efficient Sugarcane Node Cutting Machines: A Novel Approach.
- Author
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Shrestha, Bibhum, S., Sreenivas, S., Shankar, Kulkarni, Anand, Ahmed, Fahad, Sadhotra, Amrish, S, Darshan Kumar J., Maseeh, Mohammed, Baig, Sardar, and S, Akash Vandhan V.
- Subjects
CUTTING machines ,SUGARCANE ,COMPUTER vision ,CUTTING force ,AGRICULTURE - Abstract
Efficient sugarcane production is crucial in today’s competitive agricultural landscape. Traditional planting methods are cost-intensive and time-consuming and often fail to achieve adequate compression of buds due to the stalk planting nature of sugarcane. To address these challenges, a novel approach using machine vision to identify and plant sugarcane nodes is proposed. Sugarcane holds significant economic importance in India and various other countries, making its cultivation a cornerstone of many economies. The development of a sugarcane node cutting machine aims to revolutionize the process of preparing sugarcane seedlings. This machine streamlines the time-consuming task of cutting nodes, thereby reducing waste and effort associated with traditional methods. The paper focuses on designing and testing a machine for efficiently cutting sugarcane buds, intending to mechanize the preparation stage of sugarcane seedlings. By cutting undamaged bud-containing sugarcane stalks, this machine eliminates the need for laborious manual cutting, providing a timesaving and cost-effective solution for farmers. Furthermore, by measuring cutting force and power requirements, the research aimed to optimize the efficiency of sugarcane cutting processes. [ABSTRACT FROM AUTHOR]
- Published
- 2024
16. A minimum reverse inductor current control for single-phase controlled-type soft-switching converters
- Author
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WU Chao, ZHANG Li, ZHENG Zhongshu, and WANG Yiming
- Subjects
soft-switching ,zero voltage switching (zvs) ,critical conduction mode (crm) ,inverter ,wide bandgap devices ,efficiency optimization ,Applications of electric power ,TK4001-4102 - Abstract
The controlled-type soft-switching technology based on critical conduction mode (CRM) is an effective way to achieve zero voltage switching (ZVS) of switches. However, the high reverse inductor current of the conventional constant boundary conduction mode (CBCM) method leads to high conduction losses. In this paper, the single-phase three-level neutral point clamped (3L-NPC) inverter is taken as an example for analysis, and a minimum reverse inductor current control is proposed. Firstly, the requirement for achieving ZVS of switches is quantitatively analyzed, and the model of the equivalent resonance circuit is built. Accordingly, the theoretical minimum reverse inductor current for achieving ZVS in the fundamental period is derived, which lowers the conduction losses of switches. Then, by establishing the power losses analysis model of the 3L-NPC inverter, the power losses of the proposed scheme and the conventional CBCM method are calculated and compared in detail. Finally, a 1 kW single-phase 3L-NPC inverter prototype is built, and experimental results verify that the proposed method features lower conduction losses than that of the CBCM method. The maximum efficiency of the 3L-NPC inverter is increased by 0.5 percentage point.
- Published
- 2023
- Full Text
- View/download PDF
17. Modeling and structural optimization design of switched reluctance motor based on fusing attention mechanism and CNN-BiLSTM
- Author
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Yanyuan Wang, Zhenzhong Zhang, Youyun Wang, Lichun You, and Guo Wei
- Subjects
SRM ,Efficiency optimization ,SSA ,CNN-BiLSTM-SENet ,MNGO ,Engineering (General). Civil engineering (General) ,TA1-2040 - Abstract
Six-degrees of freedom (6-DOF) parallel mechanisms driven by switched reluctance motors (SRMs) can realize flexible control with high precision. Efficiency is an important indicator to measure the speed control system of SRMs. There are many characteristic factors affecting efficiency and strong nonlinear relationships between different characteristic parameters, which makes it difficult for analytical models and traditional neural network models to express their spatial correlation. For this reason, a convolutional neural network (CNN)-bidirectional long short-term memory network (BiLSTM) efficiency regression prediction model (CNN-BiLSTM-SENet) that integrates the attention mechanism (SENet) is proposed. Firstly, customize a formula for sensitivity analysis to screen characteristic parameters of efficiency. Secondly, build the CNN-BiLSTM-SENet model and use sparrow search algorithm (SSA) for hyperparameter optimization, input data to CNN to extract high-dimensional feature vectors that reflect complex changing relationships between features and efficiency while establishing feature channels. Embed the SENet to adaptively perceive and assign different weights to the feature channels, enhancing the influence of key features. Input the feature vectors outputted by the front-end network to BiLSTM to bidirectionally learn coupling relationships between sequences and complete regression prediction. Finally, propose improved northern goshawk optimization (MNGO) to solve the regression model to obtain the maximum efficiency and corresponding characteristic parameters. The results proved that the SSA-optimized CNN-BiLSTM-SENet model has higher fitting exactness and better prediction effect for efficiency regression prediction, and the MNGO also has stronger search ability and faster convergence.
- Published
- 2023
- Full Text
- View/download PDF
18. Excitation Equations for Irregular Waveguides Taking into Account the Finite Wall Conductivity and Their Application for Ultrahigh-Power Microwave Problems. Part 2. Relativistic Klynotron.
- Author
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Kravchenko, V. F., Kurayev, A. A., Matveyenko, V. V., and Rak, A. O.
- Subjects
BACKWARD wave oscillators ,TRAVELING-wave tubes ,MAGNETIC fields ,CATHODES ,MICROWAVES ,ELECTRON beams ,WAVEGUIDES - Abstract
Based on the rigorous nonlinear theory of relativistic traveling wave tubes (TWTs) and backward wave oscillators BWOs on irregular hollow waveguides with cathode filter-modulators, taking into account both propagating and supercritical waves, taking into account losses in the walls of the waveguide and the inhomogeneity of the magnetostatic field guiding the electron flow, the influence of dynamic stratification of the electron flow on the efficiency of the generator is determined. The article shows a full compensation possibility on the influence of dynamic layering on efficiency by optimizing an electronic beam in inhomogeneous high frequency and magnetic fields and the corrugated irregular waveguide characteristics when electron beam layers depositing on it. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
19. OPTIMIZING SUPPLY CHAIN EFFICIENCY WITH FUZZY CRITIC-EDAS.
- Author
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Zhang, Y. M., Song, Y. F., Meng, X., and Liu, Z. G.
- Subjects
- *
SUPPLY chains , *SUPPLY chain management - Abstract
In today's dynamic and complex global business landscape, effective supply chain network (SCN) management is critical for achieving competitive advantage and sustainability. This study presents an innovative methodology that leverages the fuzzy CRITIC (CRiteria Importance Through Intercriteria Correlation) and EDAS (Evaluation based on Distance from Average Solution) techniques to enhance the efficiency of SCNs. By integrating both quantitative and qualitative factors, the approach effectively navigates uncertainties and imprecise data in supply chain operations. The fuzzy CRITIC-EDAS method's application in a case study showcases its utility in optimizing SCN configurations for improved efficiency, cost savings, and risk reduction. The results offer a valuable decision support tool for supply chain management, promising to boost competitiveness and sustainability in an unpredictable market. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
20. 基于制氢装置效率特性的风储制氢电厂优化控制策略.
- Author
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孙东阳, 于继轩, 阮俊霖, 郑闻远, and 祖光鑫
- Abstract
Copyright of Electric Power Automation Equipment / Dianli Zidonghua Shebei is the property of Electric Power Automation Equipment Press and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2023
- Full Text
- View/download PDF
21. Wireless Power Transfer System with Current-Doubler Rectifier on the Secondary Side—Analysis, Modeling, and Verification.
- Author
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Kindl, Vladimir, Zavrel, Martin, Tyrpekl, Miroslav, Frivaldsky, Michal, and Skorvaga, Jakub
- Subjects
WIRELESS power transmission ,SYSTEM analysis ,DIODES - Abstract
In this paper, the proposal for the performance optimization of the wireless power transfer (WPT) system is given. The solution is based on the alternative configuration of the secondary-side rectifier. It is represented by a diode rectifier with a current doubler. Compared to the bridge rectifier, two diodes are replaced by the inductors. Initially, a system analysis was performed to investigate the electrical behavior and find the most optimal conditions referred to as terms of efficiency performance at nominal power. Due to this requirement, the rectifier inductors must be designed accordingly to meet this condition. The experimental verification was realized as well, while the proposed solution was compared to other common alternatives of the secondary-side rectification. The load sensitivity analysis in terms of efficiency performance was realized as well to observe the system behavior for a wide operation range. From the results, it is seen that the proposed alternative of the secondary-side rectification of the WPT system gives promising results in terms of high operating efficiency. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
22. 单相控制型软开关逆变器的最小复位电流控制.
- Author
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吴超, 张犁, 郑仲舒, and 王一鸣
- Abstract
Copyright of Electric Power Engineering Technology is the property of Editorial Department of Electric Power Engineering Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2023
- Full Text
- View/download PDF
23. Aligning process quality and efficiency in agricultural soil tillage.
- Author
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Kazenwadel, Benjamin, Becker, Simon, Graf, Marina, and Geimer, Marcus
- Subjects
AGRICULTURE ,MACHINE learning ,AGRICULTURAL equipment ,OPTICAL sensors ,TILLAGE ,AUTOMATION - Abstract
Copyright of Automatisierungstechnik is the property of De Gruyter and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2023
- Full Text
- View/download PDF
24. Advanced Power Converters and Learning in Diverse Robotic Innovation: A Review.
- Author
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Singh, Rupam, Kurukuru, Varaha Satya Bharath, and Khan, Mohammed Ali
- Subjects
- *
OBJECT recognition (Computer vision) , *TECHNOLOGICAL innovations , *ROBOTICS , *REINFORCEMENT learning , *ENERGY consumption , *SURGICAL robots , *MEDICAL robotics , *VOLTAGE control - Abstract
This paper provides a comprehensive review of the integration of advanced power management systems and learning techniques in the field of robotics. It identifies the critical roles these areas play in reshaping the capabilities of robotic systems across diverse applications. To begin, it highlights the significance of efficient power usage in modern robotics. The paper explains how advanced power converters effectively control voltage, manage current and shape waveforms, thereby optimizing energy utilization. These converters ensure that robotic components receive the precise voltage levels they require, leading to improved motor performance and enabling precise control over motor behavior. Consequently, this results in extended operational times and increased design flexibility. Furthermore, the review explores the integration of learning approaches, emphasizing their substantial impact on robotic perception, decision-making and autonomy. It discusses the application of techniques such as reinforcement learning, supervised learning and unsupervised learning, showcasing their applications in areas like object recognition, semantic segmentation, sensor fusion and anomaly detection. By utilizing these learning methods, robots become more intelligent, adaptable and capable of autonomous operation across various domains. By examining the interaction between advanced power management and learning integration, this review anticipates a future where robots operate with increased efficiency, adapt to various tasks and drive technological innovation across a wide range of industries. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
25. Modeling and structural optimization design of switched reluctance motor based on fusing attention mechanism and CNN-BiLSTM.
- Author
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Wang, Yanyuan, Zhang, Zhenzhong, Wang, Youyun, You, Lichun, and Wei, Guo
- Subjects
SWITCHED reluctance motors ,CONVOLUTIONAL neural networks ,STRUCTURAL optimization ,STRUCTURAL models ,STRUCTURAL design ,ARTIFICIAL neural networks - Abstract
• Customize a formula for sensitivity analysis to screen characteristic parameters. • Use an improved hybrid neural network with high fitting exactness and great prediction effect to establish efficiency regression prediction of SRM. • Propose improved northern goshawk optimization with strong search ability and fast convergence to optimize the objective function of the model, achieving an increase of 2.975% in efficiency. Six-degrees of freedom (6-DOF) parallel mechanisms driven by switched reluctance motors (SRMs) can realize flexible control with high precision. Efficiency is an important indicator to measure the speed control system of SRMs. There are many characteristic factors affecting efficiency and strong nonlinear relationships between different characteristic parameters, which makes it difficult for analytical models and traditional neural network models to express their spatial correlation. For this reason, a convolutional neural network (CNN)-bidirectional long short-term memory network (BiLSTM) efficiency regression prediction model (CNN-BiLSTM-SENet) that integrates the attention mechanism (SENet) is proposed. Firstly, customize a formula for sensitivity analysis to screen characteristic parameters of efficiency. Secondly, build the CNN-BiLSTM-SENet model and use sparrow search algorithm (SSA) for hyperparameter optimization, input data to CNN to extract high-dimensional feature vectors that reflect complex changing relationships between features and efficiency while establishing feature channels. Embed the SENet to adaptively perceive and assign different weights to the feature channels, enhancing the influence of key features. Input the feature vectors outputted by the front-end network to BiLSTM to bidirectionally learn coupling relationships between sequences and complete regression prediction. Finally, propose improved northern goshawk optimization (MNGO) to solve the regression model to obtain the maximum efficiency and corresponding characteristic parameters. The results proved that the SSA-optimized CNN-BiLSTM-SENet model has higher fitting exactness and better prediction effect for efficiency regression prediction, and the MNGO also has stronger search ability and faster convergence. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
26. 基于宽范围增益和效率的 LLC 谐振变换器设计方法.
- Author
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金涛, 肖晓森, 张钟艺, 吴维鑫, and 游玮
- Subjects
DESIGN - Abstract
Copyright of Electric Machines & Control / Dianji Yu Kongzhi Xuebao is the property of Electric Machines & Control and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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- 2023
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27. Wide Input and Output Voltage in Bidirectional DC-DC Converter
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Sun, Yibo, Zhan, Leilei, Tao, Xiaofeng, Wang, Xinying, Cui, Chaohui, Li, Haoran, Hu, Cungang, Zhang, Ke, Shen, Weixiang, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Jiming, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Li, Yong, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Oneto, Luca, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zamboni, Walter, Series Editor, Zhang, Junjie James, Series Editor, Tan, Kay Chen, Series Editor, Hu, Cungang, editor, and Cao, Wenping, editor
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- 2023
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28. Efficiency Optimization Control of PMSM Based on a Novel LDW_PSO Over Wide Speed Range
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Zhou, Chong, Mao, Kun, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Jiming, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Li, Yong, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Oneto, Luca, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zamboni, Walter, Series Editor, Zhang, Junjie James, Series Editor, Tan, Kay Chen, Series Editor, S. Shmaliy, Yuriy, editor, and Nayyar, Anand, editor
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- 2023
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29. Efficiency Optimization Method for Wireless Power Transfer System Between the Rocket and the Ground Based on Energy Compensation
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Wang, Zhan, Lan, Kun, Zhang, Jingang, Yu, Da, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Jiming, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Hirche, Sandra, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Li, Yong, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Möller, Sebastian, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Oneto, Luca, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zamboni, Walter, Series Editor, Zhang, Junjie James, Series Editor, Ma, Chengbin, editor, Zhang, Yiming, editor, Li, Siqi, editor, Zhao, Lei, editor, Liu, Ming, editor, and Zhang, Pengcheng, editor
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- 2023
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30. Loss Analysis of Rectifier Circuit and Its Optimization Technique in Wireless Power Transfer System
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Zhang, Xu, Chen, Qingbin, Chen, Wei, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Jiming, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Hirche, Sandra, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Li, Yong, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Möller, Sebastian, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Oneto, Luca, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zamboni, Walter, Series Editor, Zhang, Junjie James, Series Editor, Ma, Chengbin, editor, Zhang, Yiming, editor, Li, Siqi, editor, Zhao, Lei, editor, Liu, Ming, editor, and Zhang, Pengcheng, editor
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- 2023
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31. Half-Bridge Modulation Strategy for Bidirectional Wireless Power Transfer Based on Efficiency Optimization Under Light Load Conditions
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Fan, Zheng, Wang, Fusheng, Yang, Jintao, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Jiming, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Ferrari, Gianluigi, Series Editor, Duan, Haibin, Series Editor, Ferre, Manuel, Series Editor, Hirche, Sandra, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Li, Yong, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Möller, Sebastian, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Oneto, Luca, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zamboni, Walter, Series Editor, Zhang, Junjie James, Series Editor, Cao, Wenping, editor, Hu, Cungang, editor, and Chen, Xiangping, editor
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- 2023
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32. Research on optimization method of combat effectiveness based on AHP-DQN
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WANG Guoyan, CAO Hongsong, LIU Pengfei, ZHANG Zhiyuan, ZHAI Chaofan
- Subjects
operational rehearsal ,strike strategy ,analytic hierarchy process ,deep reinforcement learning ,efficiency optimization ,Military Science - Abstract
In view of the case that the fleet of ships threatens the safety of the sea area, the scenarios of red side penetration attack, blue side air defense and antimissile, as well as three kinds of anti aircraft carrier combat strategies of land, sea and air are designed. Based on the Mozi system, the multi scheme combat simulation is carried out, and the battle damage data of both sides are obtained. On this basis, an index system based on the performance parameters of decoy and attack is established, and the operational effectiveness of the three strategies is analyzed with the analytic hierarchy process (AHP). Furthermore, a Deep Reinforcement Learning (DRL) algorithm based on AHP weight is proposed, which optimizes the sea based strategy and improves the combat effectiveness by 5.36%. The research results show that the method of scenario design, combat strategy simulation, and AHP-DQN for operational efficiency optimization based on such combat simulation software as Mozi system can provide reference for anti-ship warfare.
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- 2023
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33. A Comprehensive Review on Wireless Power Transfer Systems for Charging Portable Electronics
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Arpan Laha, Abirami Kalathy, Majid Pahlevani, and Praveen Jain
- Subjects
wireless power transfer ,time-domain modeling ,frequency-domain modeling ,efficiency optimization ,resonant inverters ,resonant rectifiers ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 - Abstract
Wireless power transfer (WPT) for portable electronic applications has been gaining a lot of interest over the past few decades. This study provides a comprehensive review of the recent advancements in WPT technology, along with the challenges faced in its practical implementation. The modeling and design of WPT systems, including the effect of cross-coupling in multiple receivers, have been discussed and the techniques for efficiency improvement have been highlighted. The challenges of coil design, EMI shielding, and foreign object detection have been pointed out and various cutting-edge solutions have been presented. With improvements in wide bandgap technology, there is a push to operate WPT systems at mega-hertz frequencies. The reason for this is twofold: the miniaturization of the system and the ability to achieve a better magnetic link efficiency. However, with higher frequency comes the challenge of operating the power electronic components efficiently by using soft-switching techniques. Hence, an in-depth discussion on soft-switched topologies such as the Class D and Class E converters and their variations has been provided. Finally, the effects of magnetic field exposure on humans along with safety standards have been discussed.
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- 2023
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34. Review of Design and Control Optimization of Axial Flux PMSM in Renewable-energy Applications
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Jianfei Zhao, Xiaoying Liu, Shuang Wang, and Lixiao Zheng
- Subjects
AFPMSM ,Design optimization ,Cogging torque ,Efficiency optimization ,Control strategy optimization ,Ocean engineering ,TC1501-1800 ,Mechanical engineering and machinery ,TJ1-1570 - Abstract
Abstract Axial flux permanent magnet synchronous motors (AFPMSMs) have been widely used in wind-power generation, electric vehicles, aircraft, and other renewable-energy applications owing to their high power density, operating efficiency, and integrability. To facilitate comprehensive research on AFPMSM, this article reviews the developments in the research on the design and control optimization of AFPMSMs. First, the basic topologies of AFPMSMs are introduced and classified. Second, the key points of the design optimization of core and coreless AFPMSMs are summarized from the aspects of parameter design, structure design, and material optimization. Third, because efficiency improvement is an issue that needs to be addressed when AFPMSMs are applied to electric or other vehicles, the development status of efficiency-optimization control strategies is reviewed. Moreover, control strategies proposed to suppress torque ripple caused by the small inductance of disc coreless permanent magnet synchronous motors (DCPMSMs) are summarized. An overview of the rotor-synchronization control strategies for disc contra-rotating permanent magnet synchronous motors (CRPMSMs) is presented. Finally, the current difficulties and development trends revealed in this review are discussed.
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- 2023
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35. Research on the Immigrant Capital Investment Portfolio Based on the Mean-Variance Model.
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LIU Bing-wen, YAO Kai-wen, CHI Xu, and WANG Fei-long
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WATER conservation projects ,CAPITAL investments ,REAL property acquisition ,CAPITALISM ,SUPPLY & demand - Abstract
Hydropower development is an important strategic measure for the reform of our country's energy supply side structure, but its development often brings a large number of population migrations. Whether the resettlement funds can be used to properly resettle the reservoir resettlement is related to the sustainable development of the region and the harmony and stability of the society. The use of resettlement funds at this stage is mainly based on compensation standards and experience, without considering the efficiency of fund use. This paper introduces the principles of market economy, and considers the use of immigration funds as an investment from the perspective of immigration fund planners. According to our country's current land acquisition compensation resettlement policy, the use of funds is divided into land acquisition compensation, resettlement and follow-up livelihood assistance, and a judgment matrix is constructed according to the benefits of the resettlers to quantify the benefits and risks of different investment directions. On the premise that the three types of investment can meet the minimum needs of immigrants, the Sharpe ratio is used as a measure to calculate the fund use plan with the greatest benefit when the risk level is certain, which provides a new research paradigm for improving the efficiency of the use of immigration funds. Case analysis shows that the investment direction of the resettlement funds of the GB water conservancy project is generally in line with the resettlement wishes, but the follow-up livelihood assistance is low, and the direction of the use of funds should be adjusted to ensure the resettlement's livelihood recovery and follow-up development. [ABSTRACT FROM AUTHOR]
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- 2023
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36. Efficiency optimization for LCC‐LC compensated inductive coupling power transfer system with load‐independent zero‐phase‐angle and constant voltage output.
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Ma, Hongbo, Pan, Yu, Du, Juan, Sun, Wenzan, Yi, Junhong, Li, Xiaobin, and Xie, Meng
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ZERO voltage switching , *VOLTAGE , *SUPERCONDUCTING coils , *ENERGY transfer , *DATA transmission systems - Abstract
Summary: High‐order compensation for the inductive coupling power transfer (ICPT) system is preferred due to its high design freedom and excellent coil current harmonics suppression capability. Especially, the good harmonics suppression capability is helpful to implement the synchronous wireless transfer of energy and data with a pair of data communication coils integrated into the energy transfer coils. Thus, on basis of THD1 and THD2 comparison for different high‐order compensation topologies, the LCC‐LC compensated ICPT system with load‐independent zero phase angle (ZPA) and constant voltage output is discussed in this paper. Compared with other high‐order compensation topologies with constant voltage output such as LC‐LC, LC‐LCC, and LCC‐LCC, the LCC‐LC has the advantages of ZPA operation with zero voltage switching and less secondary‐side components. For a given magnetic coupler, infinite feasible combinations of compensation parameters can make the system accomplish ZPA and the same output characteristics. Thus, efficiency optimization of the LCC‐LC compensated ICPT system can be investigated by configuring the optimal compensation parameters. To validate the theoretical analysis, especially the efficiency improvement, the experimental platform with 270 V input and 270 V/3 kW output is designed and built. The comparative experimental results for three different the compensation parameters show the optimized system can improve greatly conversion efficiency over the entire load range, especially under light load. [ABSTRACT FROM AUTHOR]
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- 2023
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37. Efficiency Optimization of Variable Iron Loss Resistance Asynchronous Motor Based on Grey Wolf Optimization Algorithm
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Guo, Zhen, Tong, Di, Zhao, Yan-cheng, Chen, Shuang, Nai, Ji-qiu, and Ye, Ming-hao
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- 2024
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38. Efficiency Optimization via Mission Profile-Based Power Routing by Design of Hybrid Grid Connecting Converter Architecture
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Joscha Schaumburg, Johannes Kuprat, Marius Langwasser, and Marco Liserre
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DC microgrid ,efficiency optimization ,hybrid grids ,power routing ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 - Abstract
Hybrid grids with low voltage direct current (LVdc) distribution are an attractive opportunity for the integration of electric vehicle charging stations and photovoltaic power plants. With dc connectivity reduced power losses are possible, however, multiple conversion stages can impair an efficient operation. A solution can be the use of an “interconnected” architecture that allows the integration of multiple insulated dc and ac grids. The reconfiguration of this modular topology allows optimization for different design objectives. This work investigates the system efficiency-optimized reconfiguration. Two approaches for deriving the reconfiguration of the hybrid grid connecting converter architecture based on mission profiles are proposed. A validation of the analysis via laboratory results is given.
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- 2023
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39. Modulation Techniques and Coordinated Voltage Vector Distribution: Effects on Efficiency in Dual-Inverter Topology-Based Electric Drives
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Jakub Kucera, Petr Zakopal, Filip Baum, and Ondrej Lipcak
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dual-inverter topology ,multilevel inverters ,motor control ,efficiency optimization ,Space Vector PWM ,discontinuous PWM ,Technology - Abstract
The increasing popularity of electric drives employing an isolated dual-inverter (DI) topology is motivated by their superior DC-link voltage and power utilization, fault-tolerant operation, and potential for multilevel operation. These attributes are significant in battery-powered transportation, such as electric vehicles and aviation. Given the considerable freedom in modulation and control of the DI topology, this paper researches the impact of reference voltage vector distribution between the two individual inverters. The study also evaluates the influence of two well-established asynchronous modulation strategies—Space Vector PWM (SVPWM) and Depenbrock’s Discontinuous Modulation (DPWM1). Since simulation tools nowadays play a crucial role in power electronics design and concept verification, the results are based on extensive and detailed models in Matlab/Simulink. Employing the basic field-oriented control of a 12 kW induction motor with precisely parameterized SiC switching devices for accurate loss calculation, this research reveals the possibility of significant energy savings at multiple operating points. Notably, optimal efficiency is achieved when one inverter operates up to half of the nominal speed while the other solely establishes a neutral point for the winding. Moreover, the results highlight DPWM1 as a superior strategy for the DI topology, showcasing reduced converter losses. Overall, it is shown that the system’s losses can be significantly reduced just by the design of the voltage vector distribution in the drive’s operating range and the modulation strategy selection.
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- 2024
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40. Enhancing electric vehicle efficiency through model predictive control of power electronics
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Ivanovich Vatin Nikolai and Madhavi Arelli
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electric vehicles ,model predictive control ,power electronics ,efficiency optimization ,battery characteristics ,Engineering (General). Civil engineering (General) ,TA1-2040 - Abstract
This study examines the improvement of electric vehicle (EV) economy by using Model Predictive Control (MPC) in power electronics, with the goal of optimizing system performance. Experimental assessments done on different battery parameters have identified a spectrum of capacities, ranging from 55 kWh to 75 kWh, and voltages, ranging from 380V to 450V, that impact the total energy storage and power production capabilities. The efficiency percentages recorded in the battery systems ranged from 90% to 95%, suggesting differences in energy losses throughout the operations of charging and discharging. Furthermore, examinations of power electronics control configurations highlighted the significance of PWM frequencies (varying from 8 kHz to 12 kHz) and modulation indices (0.75 to 0.85) on the efficiency of power conversion. The results indicated efficiency rates ranging from 94% to 97%, emphasizing the efficacy of MPC-based techniques in improving power flow. The assessment of electric vehicle (EV) performance parameters demonstrated driving ranges ranging from 140 km to 180 km, with energy consumption rates ranging from 50 kWh to 60 kWh. The efficiency metrics ranged from 2.5 km/kWh to 3.0 km/kWh, and were directly affected by the battery properties and improvements in power electronics. Moreover, there was a little change in the link between temperature variations (ambient temperature ranging from 23°C to 29°C and battery temperature from 32°C to 40°C) and efficiency. This highlights the system's sensitivity to external variables. In summary, this relationship between battery characteristics, power electronics control, and environmental conditions in determining the efficiency of electric vehicles (EVs). The results emphasize the importance of customized setups and control techniques based on model predictive control (MPC) in optimizing energy use and increasing the distance electric cars can travel. These findings provide valuable knowledge for the development of sustainable transportation solutions in the electric vehicle industry.
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- 2024
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41. 基于 AHP-DQN 的作战效能优化方法研究.
- Author
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王国岩, 曹红松, 刘鹏飞, 张芝源, and 翟超凡
- Abstract
In view of the case that the fleet of ships threatens the safety of the sea area, the scenarios of red side penetration attack, blue side air defense and antimissile, as well as three kinds of anti aircraft carrier combat strategies of land, sea and air are designed. Based on the Mozi system, the multi scheme combat simulation is carried out, and the battle damage data of both sides are obtained. On this basis, an index system based on the performance parameters of decoy and attack is established, and the operational effectiveness of the three strategies is analyzed with the analytic hierarchy process (AHP). Furthermore, a Deep Reinforcement Learning (DRL) algorithm based on AHP weight is proposed, which optimizes the sea based strategy and improves the combat effectiveness by 5.36%. The research results show that the method of scenario design, combat strategy simulation, and AHP-DQN for operational efficiency optimization based on such combat simulation software as Mozi system can provide reference for anti-ship warfare. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
42. A Comprehensive Review on Wireless Power Transfer Systems for Charging Portable Electronics.
- Author
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Laha, Arpan, Kalathy, Abirami, Pahlevani, Majid, and Jain, Praveen
- Subjects
- *
WIRELESS power transmission , *CHARGE transfer , *MAGNETIC field effects , *ELECTRONIC equipment , *FOREIGN bodies - Abstract
Wireless power transfer (WPT) for portable electronic applications has been gaining a lot of interest over the past few decades. This study provides a comprehensive review of the recent advancements in WPT technology, along with the challenges faced in its practical implementation. The modeling and design of WPT systems, including the effect of cross-coupling in multiple receivers, have been discussed and the techniques for efficiency improvement have been highlighted. The challenges of coil design, EMI shielding, and foreign object detection have been pointed out and various cutting-edge solutions have been presented. With improvements in wide bandgap technology, there is a push to operate WPT systems at mega-hertz frequencies. The reason for this is twofold: the miniaturization of the system and the ability to achieve a better magnetic link efficiency. However, with higher frequency comes the challenge of operating the power electronic components efficiently by using soft-switching techniques. Hence, an in-depth discussion on soft-switched topologies such as the Class D and Class E converters and their variations has been provided. Finally, the effects of magnetic field exposure on humans along with safety standards have been discussed. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
43. Review of Design and Control Optimization of Axial Flux PMSM in Renewable-energy Applications.
- Author
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Zhao, Jianfei, Liu, Xiaoying, Wang, Shuang, and Zheng, Lixiao
- Abstract
Axial flux permanent magnet synchronous motors (AFPMSMs) have been widely used in wind-power generation, electric vehicles, aircraft, and other renewable-energy applications owing to their high power density, operating efficiency, and integrability. To facilitate comprehensive research on AFPMSM, this article reviews the developments in the research on the design and control optimization of AFPMSMs. First, the basic topologies of AFPMSMs are introduced and classified. Second, the key points of the design optimization of core and coreless AFPMSMs are summarized from the aspects of parameter design, structure design, and material optimization. Third, because efficiency improvement is an issue that needs to be addressed when AFPMSMs are applied to electric or other vehicles, the development status of efficiency-optimization control strategies is reviewed. Moreover, control strategies proposed to suppress torque ripple caused by the small inductance of disc coreless permanent magnet synchronous motors (DCPMSMs) are summarized. An overview of the rotor-synchronization control strategies for disc contra-rotating permanent magnet synchronous motors (CRPMSMs) is presented. Finally, the current difficulties and development trends revealed in this review are discussed. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
44. Efficiency Optimization for Operational Performance in Green Supply Chain Sourcing Using Data Envelopment Analysis: An Empirical Study
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Ransikarbum, Kasin, Chaiyaphan, Chewaphorn, Suksee, Siwaporn, Sinthuchao, Sombat, Kacprzyk, Janusz, Series Editor, Gomide, Fernando, Advisory Editor, Kaynak, Okyay, Advisory Editor, Liu, Derong, Advisory Editor, Pedrycz, Witold, Advisory Editor, Polycarpou, Marios M., Advisory Editor, Rudas, Imre J., Advisory Editor, Wang, Jun, Advisory Editor, Meesad, Phayung, editor, Sodsee, Sunantha, editor, Jitsakul, Watchareewan, editor, and Tangwannawit, Sakchai, editor
- Published
- 2022
- Full Text
- View/download PDF
45. Advanced Power Converters and Learning in Diverse Robotic Innovation: A Review
- Author
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Rupam Singh, Varaha Satya Bharath Kurukuru, and Mohammed Ali Khan
- Subjects
robotics ,power converters ,energy management ,learning approaches ,efficiency optimization ,Technology - Abstract
This paper provides a comprehensive review of the integration of advanced power management systems and learning techniques in the field of robotics. It identifies the critical roles these areas play in reshaping the capabilities of robotic systems across diverse applications. To begin, it highlights the significance of efficient power usage in modern robotics. The paper explains how advanced power converters effectively control voltage, manage current and shape waveforms, thereby optimizing energy utilization. These converters ensure that robotic components receive the precise voltage levels they require, leading to improved motor performance and enabling precise control over motor behavior. Consequently, this results in extended operational times and increased design flexibility. Furthermore, the review explores the integration of learning approaches, emphasizing their substantial impact on robotic perception, decision-making and autonomy. It discusses the application of techniques such as reinforcement learning, supervised learning and unsupervised learning, showcasing their applications in areas like object recognition, semantic segmentation, sensor fusion and anomaly detection. By utilizing these learning methods, robots become more intelligent, adaptable and capable of autonomous operation across various domains. By examining the interaction between advanced power management and learning integration, this review anticipates a future where robots operate with increased efficiency, adapt to various tasks and drive technological innovation across a wide range of industries.
- Published
- 2023
- Full Text
- View/download PDF
46. Design of a High-Efficiency DC-DC Boost Converter for RF Energy Harvesting IoT Sensors.
- Author
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Kim, Juntae and Kwon, Ickjin
- Subjects
- *
ENERGY harvesting , *DC-to-DC converters , *COMPLEMENTARY metal oxide semiconductors , *INTERNET of things , *DETECTORS , *RADIO frequency - Abstract
In this paper, an optimal design of a high-efficiency DC-DC boost converter is proposed for RF energy harvesting Internet of Things (IoT) sensors. Since the output DC voltage of the RF-DC rectifier for RF energy harvesting varies considerably depending on the RF input power, the DC-DC boost converter following the RF-DC rectifier is required to achieve high power conversion efficiency (PCE) in a wide input voltage range. Therefore, based on the loss analysis and modeling of an inductor-based DC-DC boost converter, an optimal design method of design parameters, including inductance and peak inductor current, is proposed to obtain the maximum PCE by minimizing the total loss according to different input voltages in a wide input voltage range. A high-efficiency DC-DC boost converter for RF energy harvesting applications is designed using a 65 nm CMOS process. The modeled total losses agree well with the circuit simulation results and the proposed loss modeling results accurately predict the optimal design parameters to obtain the maximum PCE. Based on the proposed loss modeling, the optimally designed DC-DC boost converter achieves a power conversion efficiency of 96.5% at a low input voltage of 0.1 V and a peak efficiency of 98.4% at an input voltage of 0.4 V. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
47. A Shielding Scheme With Ferrite Magnetic Antennas for Three-Dimensional Couplers in Long Range IPT Systems for HV Insulator Applications.
- Author
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Gu, Peng, Liu, Zhimin, Wang, Yijie, Mai, Jianwei, Zhou, Yuhao, Liu, Jianxing, and Xu, Dianguo
- Subjects
- *
SMART power grids , *FERRITES , *ANTENNAS (Electronics) , *INTELLIGENT sensors , *MAGNETIC fields - Abstract
In this article, a shielding scheme based on ferrite magnetic antennas (SS-FMA) is proposed. The scheme can effectively provide a path for the magnetic field lines of three-dimensional couplers to be concentrated and conducted. The SS-FMA is considered to be applied for long range inductive power transfer (IPT) systems of post insulators to powering smart grid sensors and improve the efficiency under the influence of metal components. The negative influence of the aluminum flanges on the magnetic field distribution is analyzed. The suppression effects of the shielding scheme on the abovementioned influence have been analyzed. Parameters of the SS-FMA are optimized. The equivalent circuit model is established, and the abovementioned process is explained from the perspective of the circuit model. A prototype of a post insulator that includes IPT system and SS-FMA has been built. When the coils of the IPT system are attached to the flanges, the efficiency can still reach 47.8% under the influence of SS-FMA, which is an increase of 13.7% compared with no shielding scheme. When the coils are slightly away from the flanges, efficiency of the system including SS-FMA can be quickly improved to 54.3%. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
48. A Real-Time Maximum Efficiency Tracker for Wireless Power Transfer Systems with Cross-Coupling.
- Author
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Laha, Arpan, Kalathy, Abirami, Pahlevani, Majid, and Jain, Praveen
- Subjects
WIRELESS power transmission ,SWITCHED capacitor circuits ,TRACKING algorithms ,TRANSMITTERS (Communication) ,FREQUENCY-domain analysis - Abstract
This article proposes a real-time dynamic maximum efficiency tracking algorithm for wireless power transfer (WPT) systems with multiple receivers. The algorithm sequentially varies the net reactance of each of the receivers using switched capacitor circuits (SCCs) to reach the maximum efficiency point (MEP). The MEP in multiple-receiver systems varies in the presence of cross-coupling. This article provides an in-depth analysis of the effects of cross-coupling and proves that cross-coupling could be beneficial or detrimental to efficiency, depending on circuit conditions such as the load resistances and coupling factors among the coils. Hence, unlike previous research, this article emphasizes the improvement of the link efficiency in the presence of cross-coupling rather than the complete elimination of its effects. Experimental results have been included for a single-transmitter and two-receiver system to validate the feasibility of the proposed algorithm. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
49. A Unipolar-Duty-Cycle Hybrid Control Strategy of Series–Series Compensated IPT System for Constant-Current Output and Efficiency Optimization.
- Author
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Chen, Yafei, Zhang, Hailong, Jin, Nan, Guo, Leilei, Wu, Jie, Park, Sung-Jun, and Kim, Dong-Hee
- Subjects
- *
ZERO voltage switching - Abstract
Based on the unipolar-duty-cycle (UDC) modulation technique, this article presents a hybrid control strategy for a series–series compensated inductive power transfer (IPT) system. By adjusting the duty cycle and the operating frequency, zero-voltage switching (ZVS) and constant-current output (CCO) can be achieved with varying coupling coefficients and load. Furthermore, as the proposed strategy enables the IPT system to lower the frequency of operation, it provides higher efficiency in the overall output power range than the conventional variable-frequency control methods. The basic principle of the UDC control strategy and its characteristics are introduced, and the system performance under UDC is analyzed and compared with the performance achieved by conventional control methods. Based on this, the UDC closed-loop control scheme, which combines PI control and hysteresis control, is proposed for the dynamic tracking of the ZVS and the CCO under a wide range of coupling coefficients and load. To validate the practicability of the proposed control strategy, a 500-W experimental prototype is configured. The simulation and experimental results indicate that the proposed scheme can stably and accurately track the ZVS and the CCO under varying parameter conditions, and it significantly improves the system efficiency. Especially, the system efficiency is improved by approximately 1.75% under light-load conditions as compared with that of the conventional control method. In addition, since the proposed method employs only one control loop, the cost and complexity of the IPT system are reduced. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
50. Simulations of the Comparative Study of the Single-Phase Shift and the Dual-Phase Shift-Controlled Triple Active Bridge Converter.
- Author
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Koneh, Norbert Njuanyi, Ko, Jae-Sub, and Kim, Dae-Kyong
- Subjects
DC-to-DC converters ,ELECTRIC transformers ,CURRENT transformers (Instrument transformer) ,COMPARATIVE studies ,ELECTRICAL load ,HARBORS ,CASCADE converters ,CATALYTIC converters for automobiles - Abstract
This paper presents a comparative study between the traditional phase shift (also referred to as the Single-Phase Shift (SPS)) and the Dual-Phase Shift (DPS) controlled Triple Active Bridge (TAB) converter. Being a multi-port DC-DC converter with flexible power flow control and characterized by high power density, the TAB converter is applicable in almost any situation where a DC-DC converter is needed. With the availability of multiple control schemes, this work highlights the advantages and disadvantages of the most employed control scheme used on the TAB converter, in comparison with the DPS control scheme that has so far been applied only on Dual-Active Bridge (DAB) converters. As an example, for a TAB converter with a 14 kW maximum power capacity, the work sees the comparison of the backflow power, the maximum possible current, the processed power at the different ports of the converter, the transformer voltage and current waveforms, and the Total Harmonic Distortion (THD). Based on the results obtained, we found that the DPS-controlled TAB converter was more efficient when applied to the TAB converter compared to the traditional phase shift control algorithm. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
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