22 results on '"Ivan Spina"'
Search Results
2. Electrochemical Cell Loss Minimization in Modular Multilevel Converters Based on Half-Bridge Modules
- Author
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Gianluca Brando, Efstratios Chatzinikolaou, Dan Rogers, and Ivan Spina
- Subjects
lithium batteries ,los minimization ,Modular Multilevel Converters ,optimization methods ,Technology - Abstract
In the developing context of distributed generation and flexible smart grids, in order to realize electrochemical storage systems, Modular Multilevel Converters (MMCs) represent an interesting alternative to the more traditional Voltage Source Inverters (VSIs). This paper presents a novel analytical investigation of electrochemical cell power losses in MMCs and their dependence on the injected common mode voltage. Steady-state cell losses are calculated under Nearest Level Control (NLC) modulation for MMCs equipped with a large number of half-bridge modules, each directly connected to an elementary electrochemical cell. The total cell losses of both a Single Star MMC (SS-MMC) and a Double Star MMC (DS MMC) are derived and compared to the loss of a VSI working under the same conditions. An optimum common mode voltage injection law is developed, leading to the minimum cell losses possible. In the worst case, it achieves a 17.5% reduction in cell losses compared to conventional injection laws. The analysis is experimentally validated using a laboratory prototype set-up based on a two-arm SS-MMC with 12 modules per arm. The experimental results are within 2.5% of the analytical models for all cases considered.
- Published
- 2021
- Full Text
- View/download PDF
3. Performance Analysis of a Full Order Sensorless Control Adaptive Observer for Doubly-Fed Induction Generator in Grid Connected Operation
- Author
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Gianluca Brando, Adolfo Dannier, and Ivan Spina
- Subjects
doubly-fed induction generator ,wind power system ,sensorless control ,full order observer ,field oriented control ,grid connected system ,Technology - Abstract
This paper focuses on the performance analysis of a sensorless control for a Doubly Fed Induction Generator (DFIG) in grid-connected operation for turbine-based wind generation systems. With reference to a conventional stator flux based Field Oriented Control (FOC), a full-order adaptive observer is implemented and a criterion to calculate the observer gain matrix is provided. The observer provides the estimated stator flux and an estimation of the rotor position is also obtained through the measurements of stator and rotor phase currents. Due to parameter inaccuracy, the rotor position estimation is affected by an error. As a novelty of the discussed approach, the rotor position estimation error is considered as an additional machine parameter, and an error tracking procedure is envisioned in order to track the DFIG rotor position with better accuracy. In particular, an adaptive law based on the Lyapunov theory is implemented for the tracking of the rotor position estimation error, and a current injection strategy is developed in order to ensure the necessary tracking sensitivity around zero rotor voltages. The roughly evaluated rotor position can be corrected by means of the tracked rotor position estimation error, so that the corrected rotor position is sent to the FOC for the necessary rotating coordinate transformation. An extensive experimental analysis is carried out on an 11 kW, 4 poles, 400 V/50 Hz induction machine testifying the quality of the sensorless control.
- Published
- 2021
- Full Text
- View/download PDF
4. Optimized Adaptive Perturb and Observe Maximum Power Point Tracking Control for Photovoltaic Generation
- Author
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Luigi Piegari, Renato Rizzo, Ivan Spina, and Pietro Tricoli
- Subjects
Maximum Power Point Tracking (MPPT) ,Perturb & Observe (P&O) ,photovoltaic generation ,push-pull converter ,Technology - Abstract
The power extracted from PV arrays is usually maximized using maximum power point tracking algorithms. One of the most widely used techniques is the perturb & observe algorithm, which periodically perturbs the operating point of the PV array, sometime with an adaptive perturbation step, and compares the PV power before and after the perturbation. This paper analyses the most suitable perturbation step to optimize maximum power point tracking performance and suggests a design criterion to select the parameters of the controller. Using this proposed adaptive step, the MPPT perturb & observe algorithm achieves an excellent dynamic response by adapting the perturbation step to the actual operating conditions of the PV array. The proposed algorithm has been validated and tested in a laboratory using a dual input inductor push-pull converter. This particular converter topology is an efficient interface to boost the low voltage of PV arrays and effectively control the power flow when input or output voltages are variable. The experimental results have proved the superiority of the proposed algorithm in comparison of traditional perturb & observe and incremental conductance techniques.
- Published
- 2015
- Full Text
- View/download PDF
5. An Innovative Reconfigurable Integrated Converter Topology Suitable for Distributed Generation
- Author
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Renato Rizzo, Ivan Spina, and Pietro Tricoli
- Subjects
distributed generation ,microgrids ,photovoltaic panels ,switching power converters ,single inductor dual output converters. ,Technology - Abstract
The electricity market and environmental concerns, with wide utilization of renewable sources, have improved the diffusion of distributed generation units changing the operations of distribution grids from passive networks to microgrids. A microgrid includes a cluster of electrical loads, energy storage devices and microsources, which provide both power and heat to their local area. A microgrid has usually one connection point to the utility grid through power electronic converters placed at customers’ sites. This paper analyses a Reconfigurable Integrated Converter (RIC) used for a domestic microgrid with inputs from the AC mains and photovoltaic arrays, and two DC outputs at different voltage levels. A RIC as a dual-boost DC-DC converter is proposed, modelled and analysed in the paper. The advantages of such a topology in comparison with traditional boost converters are outlined. Reported simulations results give evidence on the controllability of this converter and the capability of achieving the desired voltage outputs with reduced ripple.
- Published
- 2012
- Full Text
- View/download PDF
6. Integrated BMS-MMC Balancing Technique Highlighted by a Novel Space-Vector Based Approach for BEVs Application
- Author
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Gianluca Brando, Adolfo Dannier, Ivan Spina, and Pietro Tricoli
- Subjects
electric vehicles (EV) ,modular multilevel converters (MMCs) ,state-of-charge balancing ,traction drives ,battery management system (BMS) ,lithium-ion cells ,Technology - Abstract
This paper proposes a new mathematical model of modular multilevel converters for battery electric vehicles with space-vectors enabling a critical analysis of cell balancing for the battery management system. In particular, the requirements for power balancing and the actual number of degrees of freedom of the control are investigated. The paper shows that the traditional approach of cell balancing is a special case of the proposed control methodology. Numerical analyses with Matlab/Simulink™ highlight the reasons of the slow response of the standard balancing technique for specific operating conditions of the battery electric vehicle. The paper suggests potential improvements that could be introduced through the proposed generalised approach.
- Published
- 2017
- Full Text
- View/download PDF
7. Perturb and Observe Control for an Embedded Point Pivoted Absorber
- Author
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Gianluca Brando, Domenico Pietro Coiro, Marino Coppola, Adolfo Dannier, Andrea Del Pizzo, and Ivan Spina
- Subjects
wave energy converter (WEC) ,scale model ,marine ,perturb and observe (P& ,Q) ,maximum power point tracking (MPPT) ,Technology - Abstract
Marine energy sources represent an attractive and inexhaustible reservoir able to contribute to the fulfillment of the world energy demand in accordance with climate/energy regulatory frameworks. Wave energy converter (WEC) integration into the main grid requires both the maximization of the harvested energy and the proper management of the generation variability. The present paper focuses on both these mentioned issues. More specifically, it presents an embedded point pivoted absorber (PPA) and its related control strategy aimed at maximizing the harvested energy. Experimental and numerical investigations have been carried out in a wave/towing tank facility in order to derive the design characteristics of the full-scale model and demonstrate the validity and effectiveness of the proposed control strategy.
- Published
- 2016
- Full Text
- View/download PDF
8. Control and Modulation Techniques for a Centralized PV Generation System Grid Connected via an Interleaved Inverter
- Author
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Gianluca Brando, Adolfo Dannier, Andrea Del Pizzo, and Ivan Spina
- Subjects
interleaved inverter ,MPPT algorithm ,space vector modulation ,hysteresis control ,Technology ,Engineering (General). Civil engineering (General) ,TA1-2040 ,Biology (General) ,QH301-705.5 ,Physics ,QC1-999 ,Chemistry ,QD1-999 - Abstract
In the context of grid connected photovoitaic (PV) generation systems, there are two paramount aspects regarding the Maximum Power Point Tracking (MPPT) of the photovoltaic units and the continuity of the service. The most diffused MPPT algorithms are based on either perturb and observe, or on an incremental conductance approach and need both PV current and voltage measurements. Several topology reconfigurable converters are also associated with the PV plants, guaranteeing fault-tolerant features. The generation continuity can also be assured by interleaved inverters, which keep the system operating at reduced maximum power in case of failure. In this paper, an evolution of a hysteresis based MPPT algorithm is presented, based on the measurement of only one voltage, together with a novel space vector modulation suitable for a two-channel three-phase grid connected interleaved inverter. The proposed MMPT algorithm and modulation technique are tested by means of several numerical analyses on a PV generation system of about 200 kW maximum power. The results testify the validity of the proposed strategies, showing good performance, even during a fault occurrence and in the presence of deep shading conditions.
- Published
- 2016
- Full Text
- View/download PDF
9. A Variational Approach to MTPA Control of Induction Motor for EVs Range Optimization
- Author
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Mauro Di Monaco, Ivan Spina, C. Attaianese, Giuseppe Tomasso, Attaianese, Ciro, Di Monaco, Mauro, Spina, Ivan, and Tomasso, Giuseppe
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MTPA control ,business.product_category ,Steady state (electronics) ,Computer Networks and Communications ,Computer science ,Powertrain ,Stator ,Electric vehicle, induction motor, vectorial control, MTPA control, calculus of variations ,calculus of variations ,Aerospace Engineering ,Context (language use) ,Electric vehicle ,induction motor ,vectorial control ,law.invention ,Control theory ,law ,Automotive Engineering ,Torque ,Transient (oscillation) ,Electrical and Electronic Engineering ,business ,Induction motor - Abstract
The paper presents a control strategy for induction motor which optimizes both efficiency and torque response in both transient and steady state. In the context of vectorial control of induction motor, the optimum problem is defined according to the calculus of variations for a given step change of the reference torque. This allows finding the closed-form analytical solution of the current reference trajectories which minimize the amplitude of the stator current. Simulation and experimental results confirm the validity of the proposed approach that allows getting significant improvements in the drive efficiency. As a consequence, if the induction motor is used in the powertrain of an electric vehicle, the proposed control strategy can determine an increase of the range per charge, as demonstrated by the analysis of a case study.
- Published
- 2020
10. A Full Order Sensorless Control Adaptive Observer for Doubly-Fed Induction Generator
- Author
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Adolfo Dannier, Gianluca Brando, Ivan Spina, Adolfo Dannier, Gianluca Brando, Ivan Spina, Dannier, Adolfo, Brando, Gianluca, and Spina, Ivan
- Subjects
Vector control ,Wind power ,business.industry ,Stator ,Rotor (electric) ,Computer science ,Numerical analysis ,Rotors, Doubly fed induction generators, Observers, Stator windings, Sensorless control ,Context (language use) ,Turbine ,law.invention ,Control theory ,Position (vector) ,law ,business - Abstract
This paper presents a sensorless control for a Doubly Fed Induction Generator (DFIG) in the context of grid-connected turbine-based wind generation systems. The paper proposes a full order adaptive observer able to track with excellent accuracy the DFIG rotor position even in presence of significant parameters deviations. The developed adaptive observer is coupled with a traditional stator flux based Field Oriented Control (FOC). The novel approach has been validated by an extensive numerical analysis.
- Published
- 2019
11. Two‐phase high‐performance control of a reliable stand‐alone induction generator
- Author
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Ivan Spina, Davide Lauria, Andrea Del Pizzo, Luigi Pio Di Noia, Gianluca Brando, Brando, Gianluca, DEL PIZZO, Andrea, DI NOIA, LUIGI PIO, Lauria, Davide, and Spina, Ivan
- Subjects
Computer science ,020209 energy ,020208 electrical & electronic engineering ,Automatic frequency control ,Induction generator ,02 engineering and technology ,LC circuit ,Prime mover ,Control theory ,Robustness (computer science) ,0202 electrical engineering, electronic engineering, information engineering ,Voltage regulation ,Electrical and Electronic Engineering ,Machine control ,Voltage - Abstract
The study presents a significant development of an advanced control strategy for stand-alone three-phase induction generators. The system under study consists of a squirrel-cage induction generator driven mechanically by an internal combustion engine and electrically by a fault-tolerant converter coupled with a LC filter. As a novelty, in this study three low-cost electrical contactors are introduced in order to re-arrange the converter topology after a fault occurrence and a proper re-starting procedure is developed, allowing the converter to operate with only two legs. The control architecture is mainly described with respect to this last operating condition, evidencing its intrinsic robustness. The study focuses on the composite control of the converter and the prime mover in order to improve the dynamic assessment of the whole system. The converter control is designed around the sliding mode technique, due to its attractive performance, especially as far as parameter uncertainties are concerned. In order to validate the theoretical framework, this study presents the first ever made experimental tests of this system with reference to a generation unit of about 10 kVA. The results confirm the high capability of the proposed system in regulating voltage and frequency with very good dynamic features.
- Published
- 2017
12. Performance Analysis of a Full Order Sensorless Control Adaptive Observer for Doubly-Fed Induction Generator in Grid Connected Operation
- Author
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Adolfo Dannier, Ivan Spina, Gianluca Brando, Brando, G., Dannier, A., and Spina, I.
- Subjects
Lyapunov function ,Control and Optimization ,Observer (quantum physics) ,Computer science ,Stator ,Energy Engineering and Power Technology ,Flux ,full order observer ,lcsh:Technology ,Turbine ,law.invention ,symbols.namesake ,Control theory ,law ,Position (vector) ,sensorless control ,Sensitivity (control systems) ,Electrical and Electronic Engineering ,doubly-fed induction generator ,wind power system ,field oriented control ,grid connected system ,Engineering (miscellaneous) ,Vector control ,Wind power ,lcsh:T ,Renewable Energy, Sustainability and the Environment ,business.industry ,Rotor (electric) ,symbols ,business ,Energy (miscellaneous) - Abstract
This paper focuses on the performance analysis of a sensorless control for a Doubly Fed Induction Generator (DFIG) in grid-connected operation for turbine-based wind generation systems. With reference to a conventional stator flux based Field Oriented Control (FOC), a full-order adaptive observer is implemented and a criterion to calculate the observer gain matrix is provided. The observer provides the estimated stator flux and an estimation of the rotor position is also obtained through the measurements of stator and rotor phase currents. Due to parameter inaccuracy, the rotor position estimation is affected by an error. As a novelty of the discussed approach, the rotor position estimation error is considered as an additional machine parameter, and an error tracking procedure is envisioned in order to track the DFIG rotor position with better accuracy. In particular, an adaptive law based on the Lyapunov theory is implemented for the tracking of the rotor position estimation error, and a current injection strategy is developed in order to ensure the necessary tracking sensitivity around zero rotor voltages. The roughly evaluated rotor position can be corrected by means of the tracked rotor position estimation error, so that the corrected rotor position is sent to the FOC for the necessary rotating coordinate transformation. An extensive experimental analysis is carried out on an 11 kW, 4 poles, 400 V/50 Hz induction machine testifying the quality of the sensorless control.
- Published
- 2021
13. Battery losses in a MMC for BEVS application
- Author
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Gianluca Brando, Diego Iannuzzi, Ivan Spina, Adolfo Dannier, Dannier, A., Brando, G., Spina, I., and Iannuzzi, D.
- Subjects
Battery (electricity) ,Computer science ,020209 energy ,020208 electrical & electronic engineering ,Battery cell ,02 engineering and technology ,Automotive engineering ,DC-linked voltage ,Battery losse ,Electrical vehicles ,0202 electrical engineering, electronic engineering, information engineering ,CMMC topology ,Electrical and Electronic Engineering ,BMS - Abstract
Objective:This paper analyses the Modular Multilevel Converter (MMC) topology, where each individual Sub Module (SM), in half bridge configuration, is directly fed by an elementary electrochemical cell.Methods:The aim is to investigate how the reference voltages influence the cells currents waveforms, determining how the active powers and the losses are distributed among the cells. Considering a 2-level Voltage Source Inverter (VSI) topology working in the same conditions, the ratio between the MMC total cells losses and VSI total cells losses is calculated. After showing the system architecture and mathematical model, the cells current waveform investigation is presented and detailed both for triangular and sinusoidal voltage reference waveform.Results:Finally, the results are critically discussed with particular focus on the comparison between the MMC and the VSI topologies.
- Published
- 2018
14. Simplified Optimum Control Method for Monoinverter Dual Parallel PMSM Drive
- Author
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Ivan Spina, Luigi Piegari, Gianluca Brando, Brando, Gianluca, Piegari, Luigi, and Spina, Ivan
- Subjects
Test bench ,elettrici ,Computer science ,permanent magnet motor ,020208 electrical & electronic engineering ,monoinverter dual parallel (MIDP) motor drive ,02 engineering and technology ,Traction motor ,Dual (category theory) ,Maximum torque per ampere (MTPA), monoinverter dual parallel (MIDP) motor drive, permanent magnet motor, simplified control strategy, elettrici ,Maximum torque per ampere (MTPA) ,Control theory ,Control and Systems Engineering ,0202 electrical engineering, electronic engineering, information engineering ,Inverter ,020201 artificial intelligence & image processing ,simplified control strategy ,Transient (oscillation) ,Electrical and Electronic Engineering ,Synchronous motor ,Induction motor - Abstract
This paper proposes a simplified optimum control strategy for a monoinverter dual parallel (MIDP) permanent magnet synchronous motor (PMSM). With reference to the parallel PMSM unified model, two different auxiliary conditions are investigated. The first minimizes the supplied inverter current, and the second maximizes the motor's efficiency. Their formal expressions are derived by the introduction of three new normalized variables, linked to the load conditions. Thus, the optimum tracking considerations are general, and the parameters are independent. Simplified closed analytical forms are found for the optimum tracking, independently under steady-state and transient conditions. The selection of the best solution is then found via a parameter independent look-up table, and imposed through a closed-loop control diagram. The proposed control is compared to the present state of the art via experiments on a 1400-W MIDP PMSM test bench, showing an equivalent performance, with a lower computational burden.
- Published
- 2018
15. Generalised look‐up table concept for direct torque control in induction drives with multilevel inverters
- Author
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Andrea Del Pizzo, Renato Rizzo, Gianluca Brando, Adolfo Dannier, Ivan Spina, Brando, Gianluca, Dannier, Adolfo, DEL PIZZO, Andrea, Rizzo, Renato, and Spina, Ivan
- Subjects
Engineering ,business.industry ,Ripple ,Control engineering ,Direct torque control ,Control theory ,Lookup table ,Inverter ,Torque ,Transient (oscillation) ,Electrical and Electronic Engineering ,business ,Induction motor ,Voltage - Abstract
This study deals with direct torque control (DTC) of induction motor drives when a multilevel inverter is involved. The proposed control technique is finalised to reduce the amplitude of torque oscillations and to improve the motor dynamic response regardless of operating speed conditions while assuring a satisfactory input current distortion. This is achieved by using a special look-up-table built with a novel approach. The control itself is based on the application in each sampling interval of one or two voltage vectors suitably selected, in order to ensure low electromagnetic torque ripple in steady-state operations and fast dynamic behaviour in transient operations. In the algorithm, the converter voltage vectors selection is carried out by using a novel look-up table whose entry points are computed by means of a specialised relation, starting from the outputs of multilevel hysteresis controllers. The suggested method, suitable for a generic multilevel inverter, is detailed for a neutral point clamped three-level inverter. The proposed algorithm is validated by several numerical results, and compared with a DTC algorithm based on a traditional three-speed range look-up tables. Finally, some experimental results, obtained with a scale laboratory setup, are shown, discussed and compared with the numerical ones.
- Published
- 2015
16. Optimized Adaptive Perturb and Observe Maximum Power Point Tracking Control for Photovoltaic Generation
- Author
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Renato Rizzo, Pietro Tricoli, Ivan Spina, Luigi Piegari, Piegari, Luigi, Rizzo, Renato, Spina, Ivan, and Tricoli, Pietro
- Subjects
Engineering ,Control and Optimization ,Energy Engineering and Power Technology ,Perturbation (astronomy) ,push-pull converter ,Inductor ,lcsh:Technology ,Maximum power point tracking ,Perturb & Observe (P&O) ,jel:Q40 ,Control theory ,jel:Q ,jel:Q43 ,jel:Q42 ,jel:Q41 ,Electronic engineering ,jel:Q48 ,Maximum Power Point Tracking (MPPT) ,Perturb & Observe (P&O); photovoltaic generation ,jel:Q47 ,Electrical and Electronic Engineering ,Engineering (miscellaneous) ,jel:Q49 ,Push–pull converter ,Operating point ,Renewable Energy, Sustainability and the Environment ,business.industry ,lcsh:T ,Computer Science (all) ,Photovoltaic system ,jel:Q0 ,jel:Q4 ,business ,Low voltage ,Energy (miscellaneous) ,Voltage ,photovoltaic generation - Abstract
The power extracted from PV arrays is usually maximized using maximum power point tracking algorithms. One of the most widely used techniques is the perturb &, observe algorithm, which periodically perturbs the operating point of the PV array, sometime with an adaptive perturbation step, and compares the PV power before and after the perturbation. This paper analyses the most suitable perturbation step to optimize maximum power point tracking performance and suggests a design criterion to select the parameters of the controller. Using this proposed adaptive step, the MPPT perturb &, observe algorithm achieves an excellent dynamic response by adapting the perturbation step to the actual operating conditions of the PV array. The proposed algorithm has been validated and tested in a laboratory using a dual input inductor push-pull converter. This particular converter topology is an efficient interface to boost the low voltage of PV arrays and effectively control the power flow when input or output voltages are variable. The experimental results have proved the superiority of the proposed algorithm in comparison of traditional perturb &, observe and incremental conductance techniques.
- Published
- 2015
17. Integrated BMS-MMC Balancing Technique Highlighted by a Novel Space-Vector Based Approach for BEVs Application
- Author
-
Ivan Spina, Pietro Tricoli, Adolfo Dannier, Gianluca Brando, Brando, Gianluca, Dannier, Adolfo, Spina, Ivan, and Tricoli, Pietro
- Subjects
Battery (electricity) ,Engineering ,Lithium-ion cell ,Modular multilevel converters (MMCs) ,Control and Optimization ,020209 energy ,Energy Engineering and Power Technology ,02 engineering and technology ,Degrees of freedom (mechanics) ,lcsh:Technology ,0202 electrical engineering, electronic engineering, information engineering ,Battery electric vehicle ,Battery management system (BMS) ,Electrical and Electronic Engineering ,Special case ,MATLAB ,Engineering (miscellaneous) ,computer.programming_language ,Electric vehicles (EV) ,electric vehicles (EV) ,modular multilevel converters (MMCs) ,state-of-charge balancing ,traction drives ,battery management system (BMS) ,lithium-ion cells ,lcsh:T ,business.industry ,Renewable Energy, Sustainability and the Environment ,020208 electrical & electronic engineering ,Computer Science (all) ,Control engineering ,Converters ,Modular design ,Traction drive ,State-of-charge balancing ,business ,computer ,Space vector ,Energy (miscellaneous) - Abstract
This paper proposes a new mathematical model of modular multilevel converters for battery electric vehicles with space-vectors enabling a critical analysis of cell balancing for the battery management system. In particular, the requirements for power balancing and the actual number of degrees of freedom of the control are investigated. The paper shows that the traditional approach of cell balancing is a special case of the proposed control methodology. Numerical analyses with Matlab/Simulink™ highlight the reasons of the slow response of the standard balancing technique for specific operating conditions of the battery electric vehicle. The paper suggests potential improvements that could be introduced through the proposed generalised approach.
- Published
- 2017
18. Perturb and Observe Control for an Embedded Point Pivoted Absorber
- Author
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Domenico P. Coiro, Ivan Spina, Marino Coppola, Gianluca Brando, Andrea Del Pizzo, Adolfo Dannier, Brando, Gianluca, Coiro, Domenico, Coppola, Marino, Dannier, Adolfo, DEL PIZZO, Andrea, and Spina, Ivan
- Subjects
scale model ,Engineering ,Control and Optimization ,Q) ,020209 energy ,Control (management) ,Energy Engineering and Power Technology ,02 engineering and technology ,lcsh:Technology ,maximum power point tracking (MPPT) ,Marine energy ,0202 electrical engineering, electronic engineering, information engineering ,Point (geometry) ,Electrical and Electronic Engineering ,Engineering (miscellaneous) ,Towing ,wave energy converter (WEC) ,marine ,perturb and observe (P&Q); maximum power point tracking (MPPT) ,perturb and observe (P& ,Renewable Energy, Sustainability and the Environment ,business.industry ,lcsh:T ,Control engineering ,Maximization ,Grid ,business ,Scale model ,Energy (signal processing) ,Energy (miscellaneous) - Abstract
Marine energy sources represent an attractive and inexhaustible reservoir able to contribute to the fulfillment of the world energy demand in accordance with climate/energy regulatory frameworks. Wave energy converter (WEC) integration into the main grid requires both the maximization of the harvested energy and the proper management of the generation variability. The present paper focuses on both these mentioned issues. More specifically, it presents an embedded point pivoted absorber (PPA) and its related control strategy aimed at maximizing the harvested energy. Experimental and numerical investigations have been carried out in a wave/towing tank facility in order to derive the design characteristics of the full-scale model and demonstrate the validity and effectiveness of the proposed control strategy.
- Published
- 2016
19. Control and Modulation Techniques for a Centralized PV Generation System Grid Connected via an Interleaved Inverter
- Author
-
Ivan Spina, Gianluca Brando, Andrea Del Pizzo, Adolfo Dannier, Brando, Gianluca, Dannier, Adolfo, DEL PIZZO, Andrea, and Spina, Ivan
- Subjects
Engineering ,Maximum power principle ,020209 energy ,02 engineering and technology ,lcsh:Technology ,Maximum power point tracking ,lcsh:Chemistry ,interleaved inverter ,MPPT algorithm ,space vector modulation ,hysteresis control ,Control theory ,0202 electrical engineering, electronic engineering, information engineering ,Electronic engineering ,Grid-connected photovoltaic power system ,General Materials Science ,Instrumentation ,lcsh:QH301-705.5 ,Fluid Flow and Transfer Processes ,business.industry ,lcsh:T ,Process Chemistry and Technology ,020208 electrical & electronic engineering ,Photovoltaic system ,General Engineering ,Converters ,Grid ,lcsh:QC1-999 ,Computer Science Applications ,lcsh:Biology (General) ,lcsh:QD1-999 ,lcsh:TA1-2040 ,Inverter ,business ,lcsh:Engineering (General). Civil engineering (General) ,Space vector modulation ,lcsh:Physics - Abstract
In the context of grid connected photovoitaic (PV) generation systems, there are two paramount aspects regarding the Maximum Power Point Tracking (MPPT) of the photovoltaic units and the continuity of the service. The most diffused MPPT algorithms are based on either perturb and observe, or on an incremental conductance approach and need both PV current and voltage measurements. Several topology reconfigurable converters are also associated with the PV plants, guaranteeing fault-tolerant features. The generation continuity can also be assured by interleaved inverters, which keep the system operating at reduced maximum power in case of failure. In this paper, an evolution of a hysteresis based MPPT algorithm is presented, based on the measurement of only one voltage, together with a novel space vector modulation suitable for a two-channel three-phase grid connected interleaved inverter. The proposed MMPT algorithm and modulation technique are tested by means of several numerical analyses on a PV generation system of about 200 kW maximum power. The results testify the validity of the proposed strategies, showing good performance, even during a fault occurrence and in the presence of deep shading conditions.
- Published
- 2016
20. Torque Derivative Control (TDC) in Induction Motor Drives Supplied by Multilevel Inverters
- Author
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Ivan Spina, Gianluca Brando, Renato Rizzo, Andrea Del Pizzo, Adolfo Dannier, Brando, Gianluca, Dannier, Adolfo, DEL PIZZO, Andrea, Rizzo, Renato, and Spina, Ivan
- Subjects
Engineering ,Stall torque ,Vector control ,business.industry ,020209 energy ,020208 electrical & electronic engineering ,02 engineering and technology ,Direct torque control ,Control theory ,0202 electrical engineering, electronic engineering, information engineering ,Torque ,Inverter ,Torque ripple ,Electrical and Electronic Engineering ,business ,Induction motor ,Machine control - Abstract
The study deals with a novel torque derivative control of induction motor drives. The proposed technique is mainly finalised to improve the motor dynamic response regardless of speed operating conditions, ensuring satisfactory values of both motor currents distortion and torque ripple. The core of the discussed approach is a special look-up table, in which the converter voltage space vectors are sorted with respect to their influence on the torque derivative, taking also into account their influence on the flux magnitude. The table is indeed accessed by a desired torque derivative value, obtained by properly processing the output of hysteresis controllers. Moreover, a variable duty-cycle technique is implemented in order to ensure a satisfactory torque ripple in steady-state conditions. The proposed algorithm, suitable for a general multilevel inverter, is numerically tested on a three-level neutral point clamped inverter and its performance are compared with the ones obtained by a traditional direct torque control method based on three speed ranges look-up tables. The control is then validated experimentally by means of a reduced scale laboratory prototype fixing the same condition used for numerical analysis.
- Published
- 2016
21. Controlled Fault-Tolerant Power Converters for Power Quality Enhancement
- Author
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Luigi Pio Di Noia, Fabio Genduso, Rosario Miceli, Ivan Spina, Di Noia, L, Spina, I, Genduso, F, Miceli, R, DI NOIA, LUIGI PIO, Spina, Ivan, Genduso, Fabio, and Miceli, Rosario
- Subjects
Engineering ,Switched-mode power supply ,power supply quality ,power system control ,Settore ING-IND/32 - Convertitori, Macchine E Azionamenti Elettrici ,Power budget ,power quality enhancement ,Topology ,Maximum power point tracking ,fault tolerant power converter ,fuel cell ,power supplie ,Electric power system ,Mathematical model ,power convertor ,Electronic engineering ,controlled fault-tolerant power converter ,Power-flow study ,Circuit fault ,hybrid power system ,distributed generation ,Fault tolerant system ,business.industry ,Fault tolerance ,Reliability engineering ,Power rating ,Base load power plant ,Power quality ,Modeling and Simulation ,power conditioning equipment ,Electric power ,Vector ,business ,fault tolerance ,power convertors ,controlled fault-tolerant power converters ,fault tolerant power converters ,Circuit faults ,Fault tolerant systems ,Vectors ,fuel cells ,hybrid power systems ,power supplies - Abstract
Power quality depends generally on the interaction of electrical power with electrical equipments. If electrical equipments operate correctly and reliably without being damaged or stressed, a suitable level of power quality is assured. On the other hand, if the electrical equipment malfunctions, is unreliable, or is damaged during normal usage, power quality is poor and probably the economical loss could be important like the technical one. In the scenario of the Distributed Generation, power quality issues will be moreover important because an higher dissemination of power conditioning equipment will be requested and this obviously increases the sources of vulnerability of the electrical system. In this paper fault tolerant power converters are considered as a viable solution of power quality problems and a suitable control algorithm of them is presented. The control proposed in the paper is based on the model of the power converter reformulated in terms of healthy leg binary variable and the paper shows how this control is able to save the aspect of power quality when the converter works in the linear range. The effectiveness of such an algorithm and of the fault tolerant power converters are finally verified by means of simulations.
- Published
- 2013
22. Optimum torque/current control of dual-PMSM Single-VSI drive
- Author
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Andrea Del Pizzo, Diego Iannuzzi, Ivan Spina, DEL PIZZO, Andrea, Iannuzzi, Diego, and Spina, Ivan
- Subjects
PMSM motor ,lcsh:Electrical engineering. Electronics. Nuclear engineering ,Dual motor ,lcsh:TK1-9971 ,Optimized control - Abstract
The paper deals with isotropic PM-brushless drives in configuration “single-inverter, dual-motor” operating with unbalanced load-torques. An innovative control algorithm is presented. It is suitable to minimize the resultant armature current needed to obtain an assigned resultant motor torque, whatever is the load unbalance. Simplified analytical expressions are given in order to quickly evaluate optimized reference currents with good approximation. From these reference values, a predictive feeding algorithm evaluates the reference voltage space-vector for the inverter supplying the two motors in parallel. Current and torque oscillation, torque/current ratio, dynamic response and stability are the mainly observed quantities. Effectiveness of proposed control techniques is highlighted.
- Published
- 2010
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