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22. Optimal configuration of distributed power flow controller to enhance system loadability via mixed integer linear programming

Author

Zhao Jingbo, Qi Wang, Ninghui Zhu, Yi Tang, Liu Yuqian, Jianfeng Dai, and Jia Ning

Subjects
TK1001-1841, Renewable Energy, Sustainability and the Environment, Computer science, 020209 energy, Distributed power flow controller (DPFC), 020208 electrical & electronic engineering, Energy Engineering and Power Technology, Distributed power, Optimal configuration, TJ807-830, 02 engineering and technology, Energy consumption, Transmission system, Fuzzy logic, Renewable energy sources, Electric power system, Production of electric energy or power. Powerplants. Central stations, Control theory, Mixed integer linear programming, Limit (music), 0202 electrical engineering, electronic engineering, information engineering, System loadability, Integer programming
Abstract

Increasing energy consumption has caused power systems to operate close to the limit of their capacity. The distributed power flow controller (DPFC), as a new member of distributed flexible AC transmission systems, is introduced to remove this barrier. This paper proposes an optimal DPFC configuration method to enhance system loadability considering economic performance based on mixed integer linear programming. The conflicting behavior of system loadability and DPFC investment is analyzed and optimal solutions are calculated. Thereafter, the fuzzy decision-making method is implemented for determining the most preferred solution. In the most preferred solution obtained, the investment of DPFCs is minimized to find the optimal number, locations and set points. Simulation results on the IEEE-RTS79 system demonstrate that the proposed method is effective and reasonable.

Published
2019

24. Stability Modeling of a Three-Terminal MMC-HVDC Transmission System.

Author

Zhang, Bo, Du, Xiong, Du, Chengmao, Zhao, Jingbo, and Li, Fangyuan

Subjects
STABILITY criterion, FREQUENCY-domain analysis, POWER transmission
Abstract

Multi-terminal modular multilevel converter (MMC) power transmission is the current development trend in DC transmission. However, owing to its fast control and dynamic characteristics, it may interact with the other inductive devices or the grid and cause stability issues. This paper describes the use of the impedance analysis method in the frequency domain to analyze system stability. First, the multi-harmonic linearization method is used to model the impedance of a three-terminal MMC system. To make the model more accurate, the modeling considers the effect of frequency coupling caused by an asymmetric controller and the AC sampling site position. This paper then proposes an equivalent method of the grid impedance for the three-terminal system that can accurately judge the stability of the grid-connected system when the AC side is coupled. This work provides a theoretical basis for the prediction and suppression of the oscillation of MMC grid-connected system with coupling on the AC side. Finally, a three-terminal MMC model is built in Matlab/Simulink and the Nyquist stability criterion is used to verify the correctness of the analysis. [ABSTRACT FROM AUTHOR]

Published
2022
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25. Research on Optimal Placement and Sizing of TCPST

Author

Zhang Ke, Li Qun, Liu Jiankun, Ningyu Zhang, Zhao Jingbo, and Dehong Teng

Subjects
Computer science, 020209 energy, 020208 electrical & electronic engineering, Site selection, 02 engineering and technology, Blocking (statistics), Sizing, Reliability engineering, Electric power transmission, Transmission (telecommunications), Limit (music), 0202 electrical engineering, electronic engineering, information engineering, Node (circuits), Voltage
Abstract

A new generation of flexible AC transmission devices such as TCPST can effectively improve the transmission capacity of transmission lines. However, TCPST has been in the theoretical research stage, so there is an urgent need for a TCPST site selection and capacity setting method that can guide the actual engineering. This paper considers the blocking information of the line, first introduces the line active power flow performance index, which compares the actual power flow with the power flow stability limit; then, based on this index, the voltage siting factor and phase angle siting factor of the TCPST pre-installed branch are determined, comprehensive comparison of the two factors, the branch with the largest absolute value is the best installation location for TCPST; finally, according to the best site selection, the optimal capacity of the installation is calculated after determining the voltage amplitude injected by TCPST. Tests based on the equivalent systems of IEEE14, and IEEE118 node networks show that the method in this paper is feasible and practical.

Published
2020

26. Research on Microgrid Dispatch Considering the Charge and Discharge Strategy of Electric Vehicles

Author

Zhao Jingbo, Ke. Xu, Pan Zhang, Xun Dou, and ShiZhen Wang

Subjects
business.product_category, Computer science, 020209 energy, 020208 electrical & electronic engineering, Control (management), 02 engineering and technology, Automotive engineering, Optimal scheduling, Electric vehicle, 0202 electrical engineering, electronic engineering, information engineering, Load model, Microgrid, Cost of electricity by source, business, Charge and discharge, Energy (signal processing)
Abstract

With the rapid development of electric vehicles and microgrid technology at home and abroad, the connection between them has become increasingly close, so studying the charging and discharging strategies of electric vehicles is of great significance to the optimal operation of microgrids. A microgrid energy optimal scheduling method considering electric vehicle charging and discharging strategies is proposed in this paper. First, based on the driving characteristics of electric vehicles and the charging and discharging strategy implemented by the microgrid to electric vehicles, the load model of electric vehicles under both disordered charging and ordered charging and discharging is established. Then, considering operating costs and pollution control costs, a microgrid energy optimal scheduling model considering the charging and discharging strategies of electric vehicles is established. Finally, through an example with electric vehicles, the objective function is solved with two operating strategies. The calculation shows that when electric vehicles are connected to the microgrid in an orderly charge and discharge according to the time of use price, it will effectively reduce the peak-valley difference and the cost of electricity used by users, and it is beneficial to environmental governance.

Published
2020

29. Subsynchronous resonance and its mitigation for power system with unified power flow controller

Author

Xinyao Zhu, Qian Zhou, Jiankun Liu, Xiangping Kong, Zhao Jingbo, and Meng Jin

Subjects
Engineering, TK1001-1841, 020209 energy, Supplementary subsynchronous damping controller (SSDC), Energy Engineering and Power Technology, Unified power flow controller (UPFC), TJ807-830, 02 engineering and technology, Renewable energy sources, Electric power system, Production of electric energy or power. Powerplants. Central stations, Control theory, Unified power flow controller, Subsynchronous resonance, 0202 electrical engineering, electronic engineering, information engineering, Time domain, Subsynchronous resonance (SSR), Damping torque, Damping torque analysis, Renewable Energy, Sustainability and the Environment, business.industry, 020208 electrical & electronic engineering, Control engineering, AC power, Series capacitor compensation, business, Decoupling (electronics)
Abstract

Control strategy of unified power flow controller (UPFC) utilizing dq decoupling control is deduced in this paper, which can closely follow the control orders of the active and reactive power. The subsynchronous resonance (SSR) characteristics of a series compensated system equipped with UPFC are studied, and the results reveal that SSR characteristics of the system may vary significantly with UPFC in service or not. Consequently, supplementary subsynchronous damping controller (SSDC) for UPFC is proposed and investigated, and the effectiveness of the proposed SSDC is verified by damping torque analysis and time domain simulations.

Published
2017

30. The Role of Binocular Vision in Avoiding Virtual Obstacles While Walking.

Author

Zhao, Jingbo and Allison, Robert S.

Subjects
BINOCULAR vision, VIRTUAL reality, STEREO image processing, STEREOSCOPIC views
Abstract

Advances in Virtual Reality technology have enabled physical walking in virtual environments. While most Virtual Reality systems render stereoscopic images to users, the implication of binocular viewing with respect to the performance of human walking in virtual environments remains largely unknown. In the present study, we conducted two walking experiments in virtual environments using a linear treadmill and a novel projected display known as the Wide Immersive Stereo Environment (WISE) to study the role of binocular viewing in virtual locomotion. The first experiment investigated the walking performance of people stepping over obstacles while the second experiment focused on a scenario on stepping over gaps. Both experiments were conducted under both stereoscopic viewing and non-stereoscopic viewing conditions. By analysing the gait parameters, we found that binocular viewing helped people to make more accurate movements to step over obstacles and gaps in virtual locomotion. [ABSTRACT FROM AUTHOR]

Published
2021
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34. In-Air Handwriting by Passive Gesture Tracking Using Commodity WiFi.

Author

Han, Zijun, Lu, Zhaoming, Wen, Xiangming, Zhao, Jingbo, Guo, Lingchao, and Liu, Yue

Abstract

Recent years have witnessed the great potential of adopting Channel State Information (CSI) for human-computer interaction by gestures. However, most current solutions either depend on specialized hardware or demand priori learning of wireless signal patterns, which face critical downsides in availability, reliability and extensibility. Hence this letter presents AirDraw, a novel learning-free in-air handwriting system by passive gesture tracking using only three commodity WiFi devices. First, we denoise CSI measurements by the ratio between two close-by antennas, and further separate the reflected signal from noise by performing Principal Component Analysis. Besides, we propose a robust signal calibration algorithm for tracking correction by eliminating the static components unrelated to hand motion. The prototype of AirDraw is fully realized and evaluated in real scenario. Extensive experiments yield that AirDraw can track user’s hand trace with a median error lower than 2.2 cm. [ABSTRACT FROM AUTHOR]

Published
2020
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