Pub Date : 2009-05-17DOI: 10.1109/IPEMC.2009.5157439
Xiao-Dong Liu, Changhu Jiang, Yanfei Liu, Jiaojiao Deng
In this paper, a novel control method is introduced which refers to the concept of parallel current-mode control algorithm to obtain good dynamic performance for Buck converter undergoing a rapid load change and input voltage change. The duty cycle consisting of two terms: voltage term and current term is simple for implementation .Since there are only three additions and two multiplications. Besides, the small-signal model of parallel current-mode controlled Buck converter is presented for the design of compensator to satisfy steady and dynamic requirement of the system. The simulation not only verifies the validity of the compensation, but also demonstrates that the parallel current mode control has superior performance as compared with peak mode control.
{"title":"Modeling and analysis of Buck converter based on parallel current mode control strategy","authors":"Xiao-Dong Liu, Changhu Jiang, Yanfei Liu, Jiaojiao Deng","doi":"10.1109/IPEMC.2009.5157439","DOIUrl":"https://doi.org/10.1109/IPEMC.2009.5157439","url":null,"abstract":"In this paper, a novel control method is introduced which refers to the concept of parallel current-mode control algorithm to obtain good dynamic performance for Buck converter undergoing a rapid load change and input voltage change. The duty cycle consisting of two terms: voltage term and current term is simple for implementation .Since there are only three additions and two multiplications. Besides, the small-signal model of parallel current-mode controlled Buck converter is presented for the design of compensator to satisfy steady and dynamic requirement of the system. The simulation not only verifies the validity of the compensation, but also demonstrates that the parallel current mode control has superior performance as compared with peak mode control.","PeriodicalId":375971,"journal":{"name":"2009 IEEE 6th International Power Electronics and Motion Control Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128402674","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-05-17DOI: 10.1109/IPEMC.2009.5157518
Jonghoon Kim, Seongjun Lee, Bohyung Cho
The State of charge (SOC) estimation algorithm uses the model parameter, which includes capacity, open circuit voltage (OCV), resistance and capacitance. These model parameter values are subject to be changed at varying temperatures[1–4]. In order to estimate SOC for temperature variation, it is indispensable to include the temperature effect on battery's performance. In this paper, the state of charge estimation employing empirical parameters measurements is introduced for SOC estimation for various temperatures. The internal parameters are measured on Li-Ion batteries from 10°C through 50°C at an interval of 10°C. Especially, the modified parameters are applied to estimate SOC at below room temperature and low SOC. The measured results are incorporated in the extend kalman filter (EKF) algorithm[5,6] and verified by comparison of Ah-counting and EKF result. The estimation and the results are shown to be under 3%.
{"title":"The State of Charge estimation employing empirical parameters measurements for various temperatures","authors":"Jonghoon Kim, Seongjun Lee, Bohyung Cho","doi":"10.1109/IPEMC.2009.5157518","DOIUrl":"https://doi.org/10.1109/IPEMC.2009.5157518","url":null,"abstract":"The State of charge (SOC) estimation algorithm uses the model parameter, which includes capacity, open circuit voltage (OCV), resistance and capacitance. These model parameter values are subject to be changed at varying temperatures[1–4]. In order to estimate SOC for temperature variation, it is indispensable to include the temperature effect on battery's performance. In this paper, the state of charge estimation employing empirical parameters measurements is introduced for SOC estimation for various temperatures. The internal parameters are measured on Li-Ion batteries from 10°C through 50°C at an interval of 10°C. Especially, the modified parameters are applied to estimate SOC at below room temperature and low SOC. The measured results are incorporated in the extend kalman filter (EKF) algorithm[5,6] and verified by comparison of Ah-counting and EKF result. The estimation and the results are shown to be under 3%.","PeriodicalId":375971,"journal":{"name":"2009 IEEE 6th International Power Electronics and Motion Control Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128493144","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-05-17DOI: 10.1109/IPEMC.2009.5157558
F. Zhuo, Longhui Wu, Zhe Chen, Xianwei Wang, Zhaoan Wang
In power system, capacitors are widely used to compensate reactive power, which generally cause resonance problems in harmonic distorted network. In this paper, A method of using a parallel active power filter (PAPF) to damp the resonances is proposed. The proposed method is compound with traditional method, it shows that whether the capacitor current is included in the detecting current of PAPF or not. Also the PAPF with proposed method has strong ability in harmonic compensation. Finally, the experiment results are presented to verify the analysis.
{"title":"Study on a control method of PAPF for resonance damping and harmonics compensation in power system","authors":"F. Zhuo, Longhui Wu, Zhe Chen, Xianwei Wang, Zhaoan Wang","doi":"10.1109/IPEMC.2009.5157558","DOIUrl":"https://doi.org/10.1109/IPEMC.2009.5157558","url":null,"abstract":"In power system, capacitors are widely used to compensate reactive power, which generally cause resonance problems in harmonic distorted network. In this paper, A method of using a parallel active power filter (PAPF) to damp the resonances is proposed. The proposed method is compound with traditional method, it shows that whether the capacitor current is included in the detecting current of PAPF or not. Also the PAPF with proposed method has strong ability in harmonic compensation. Finally, the experiment results are presented to verify the analysis.","PeriodicalId":375971,"journal":{"name":"2009 IEEE 6th International Power Electronics and Motion Control Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128544727","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-05-17DOI: 10.1109/IPEMC.2009.5157736
M. Xiaohe, Liu Jianxun, Z. Weiwei
Traditional methods of AC synchronous generator short-circuit fault analysis such as symmetrical component method, coordinate transformation method can not consider eddy current, while multi-loop method can only use air-gap magnetic conductivity concept to calculate inductances, which roughly considers the saturation of ferromagnetic materials. Finite Element Method (FEM) can solve the above problems, but it has disadvantage of considering single coil type in one model. Therefore Uniform Field and Circuit Coupled FEM (UFCCFEM) is proposed in this article. It adds additional variable loop-current into external circuit equations to form systematic coupled equations, which can fully consider solid coil eddy current influence and stranded coil current linear distribution influence. This method has less simulation time than pure eddy FEM model and more accurate short-circuit current transient characteristic than pure transient FEM. Perform this method on a certain aeronautic AC power synchronous generator, eddy current and electric potential transient waveforms are obtained and compare with experimental values to verify the correctness of the method. Spatial flux linkage transient distribution plot also show that UFCCFEM can conveniently consider transient armature reactance towards magnetic field. This method has been successfully applied on synchronous generator short-circuit fault analysis of constant speed and frequency aeronautic AC power.
{"title":"Uniform Field and Circuit Coupled Finite Element Method for short-circuit transient eddy analysis on aeronautic AC power synchronous generator","authors":"M. Xiaohe, Liu Jianxun, Z. Weiwei","doi":"10.1109/IPEMC.2009.5157736","DOIUrl":"https://doi.org/10.1109/IPEMC.2009.5157736","url":null,"abstract":"Traditional methods of AC synchronous generator short-circuit fault analysis such as symmetrical component method, coordinate transformation method can not consider eddy current, while multi-loop method can only use air-gap magnetic conductivity concept to calculate inductances, which roughly considers the saturation of ferromagnetic materials. Finite Element Method (FEM) can solve the above problems, but it has disadvantage of considering single coil type in one model. Therefore Uniform Field and Circuit Coupled FEM (UFCCFEM) is proposed in this article. It adds additional variable loop-current into external circuit equations to form systematic coupled equations, which can fully consider solid coil eddy current influence and stranded coil current linear distribution influence. This method has less simulation time than pure eddy FEM model and more accurate short-circuit current transient characteristic than pure transient FEM. Perform this method on a certain aeronautic AC power synchronous generator, eddy current and electric potential transient waveforms are obtained and compare with experimental values to verify the correctness of the method. Spatial flux linkage transient distribution plot also show that UFCCFEM can conveniently consider transient armature reactance towards magnetic field. This method has been successfully applied on synchronous generator short-circuit fault analysis of constant speed and frequency aeronautic AC power.","PeriodicalId":375971,"journal":{"name":"2009 IEEE 6th International Power Electronics and Motion Control Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128574292","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-05-17DOI: 10.1109/IPEMC.2009.5157494
Laili Wang, Weimin Zhang, Y. Pei, Xu Yang, Zhaoan Wang
A two-stage topology which is very suitable for 24V input, low voltage and high current output DC/DC converter is proposed. The first stage is two-phase interleaved Boost for regulating voltage, and the second stage is a fixed 50% duty cycle full-bridge (FB) for isolation and power transmission. To show its advantages in loss reduction, two topologies are also introduced for loss comparison. One is full-bridge which is typically used in industry, and the other one is two-phase-buck+full-bridge (TPBuck+FB). Through loss analysis and comparison of the three topologies mentioned above, we can easily come to the conclusion that the newly proposed topology could get higher efficiency than conventional topologies, especially under the condition of high power and low input voltage. Moreover, the magnitude of input current ripple is partly canceled because of two-phase interleaving operation of first stage, which means the size of input filter can be accordingly reduced. An experimental prototype using the new topology has been made to identify its high efficiency and high power density.
{"title":"A two-stage topology for 24V input low voltage high current DC/DC converter","authors":"Laili Wang, Weimin Zhang, Y. Pei, Xu Yang, Zhaoan Wang","doi":"10.1109/IPEMC.2009.5157494","DOIUrl":"https://doi.org/10.1109/IPEMC.2009.5157494","url":null,"abstract":"A two-stage topology which is very suitable for 24V input, low voltage and high current output DC/DC converter is proposed. The first stage is two-phase interleaved Boost for regulating voltage, and the second stage is a fixed 50% duty cycle full-bridge (FB) for isolation and power transmission. To show its advantages in loss reduction, two topologies are also introduced for loss comparison. One is full-bridge which is typically used in industry, and the other one is two-phase-buck+full-bridge (TPBuck+FB). Through loss analysis and comparison of the three topologies mentioned above, we can easily come to the conclusion that the newly proposed topology could get higher efficiency than conventional topologies, especially under the condition of high power and low input voltage. Moreover, the magnitude of input current ripple is partly canceled because of two-phase interleaving operation of first stage, which means the size of input filter can be accordingly reduced. An experimental prototype using the new topology has been made to identify its high efficiency and high power density.","PeriodicalId":375971,"journal":{"name":"2009 IEEE 6th International Power Electronics and Motion Control Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128173548","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-05-17DOI: 10.1109/IPEMC.2009.5157631
X. Yue, Xuejun Ma, Hongliang Wang
The sinusoidal pulse width modulation(SPWM)has been widely used because of its simple implementation. The number of output voltage pulses and the frequency of the lowest harmonic voltage in unipolar SPWM are twice that of bipolar SPWM With The same switching frequency, so the unipolar SPWM facilitates the choice of filter and has better output waveforms. For the medium or low voltage high-current applications, High capacity switching devices such as IGBT (Insulated Gate Bipolar Transistor) are expected, but the capacitance of the device IGBT decreases with its switching frequency increasing. There is a contradiction in choices between high-capacity switching device and the filter. One of the solutions is to achieve higher equivalent output frequency by lower switching frequency. The idea of unipolar N-multiple-frequency SPWM is put forward in this paper and its principle is given in two-level voltage source inverter (VSI). The comparison between unipolar N-multiple frequency SPWM and the carrier phase-shifting SPWM (CPS-SPWM) is analyzed. Their essential differences are pointed out. Finally, a main circuit topology is established
{"title":"A conceit of unipolar N-multiple frequency SPWM and the main circuit topology","authors":"X. Yue, Xuejun Ma, Hongliang Wang","doi":"10.1109/IPEMC.2009.5157631","DOIUrl":"https://doi.org/10.1109/IPEMC.2009.5157631","url":null,"abstract":"The sinusoidal pulse width modulation(SPWM)has been widely used because of its simple implementation. The number of output voltage pulses and the frequency of the lowest harmonic voltage in unipolar SPWM are twice that of bipolar SPWM With The same switching frequency, so the unipolar SPWM facilitates the choice of filter and has better output waveforms. For the medium or low voltage high-current applications, High capacity switching devices such as IGBT (Insulated Gate Bipolar Transistor) are expected, but the capacitance of the device IGBT decreases with its switching frequency increasing. There is a contradiction in choices between high-capacity switching device and the filter. One of the solutions is to achieve higher equivalent output frequency by lower switching frequency. The idea of unipolar N-multiple-frequency SPWM is put forward in this paper and its principle is given in two-level voltage source inverter (VSI). The comparison between unipolar N-multiple frequency SPWM and the carrier phase-shifting SPWM (CPS-SPWM) is analyzed. Their essential differences are pointed out. Finally, a main circuit topology is established","PeriodicalId":375971,"journal":{"name":"2009 IEEE 6th International Power Electronics and Motion Control Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128614578","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-05-17DOI: 10.1109/IPEMC.2009.5157533
Qinglong Zhong, Lei Li
Zeta mode three-level AC/AC converter can realize three-level voltage before output filter, which can get a better spectrum and reduce bulk of the filter. Compared with non-isolation and low or middle frequency isolation AC/DC/AC converters, it is single stage. And compared with Buck non-isolation AC/AC converter which can only realize buck output voltage, it can realize buck and boost output voltage. Zeta mode three-level AC/AC converter has four operation states in one period of input voltage and three different operation modes in one switching period. The non-complementary control strategy proposed makes the converter switch smoothly between different operation modes without any voltage spike. It also realizes non-complementary control in bidirectional power flow. As a result, the converter is suitable to different kinds of loads. It doesn't need to think over dead-time and its bad effects.
{"title":"The non-complementary control strategy of Zeta mode three-level AC/AC converter","authors":"Qinglong Zhong, Lei Li","doi":"10.1109/IPEMC.2009.5157533","DOIUrl":"https://doi.org/10.1109/IPEMC.2009.5157533","url":null,"abstract":"Zeta mode three-level AC/AC converter can realize three-level voltage before output filter, which can get a better spectrum and reduce bulk of the filter. Compared with non-isolation and low or middle frequency isolation AC/DC/AC converters, it is single stage. And compared with Buck non-isolation AC/AC converter which can only realize buck output voltage, it can realize buck and boost output voltage. Zeta mode three-level AC/AC converter has four operation states in one period of input voltage and three different operation modes in one switching period. The non-complementary control strategy proposed makes the converter switch smoothly between different operation modes without any voltage spike. It also realizes non-complementary control in bidirectional power flow. As a result, the converter is suitable to different kinds of loads. It doesn't need to think over dead-time and its bad effects.","PeriodicalId":375971,"journal":{"name":"2009 IEEE 6th International Power Electronics and Motion Control Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127438228","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-05-17DOI: 10.1109/IPEMC.2009.5157447
Ping Rong, Wei Chen, Wei Zhang, Zheng-yu Lu
in this paper, a family of ZVZCS dual switch flyback dc-dc converters were analyzed, which all feature soft-switching, low voltage stresses and good adaptability of wide range input. The main switches and auxiliary switch of these converters realize zero-voltage turning-on (ZVS) and the rectifier diode achieves zero-current turning-off (ZCS). They adopt different auxiliary circuit to realize soft-switching. The strengths and weaknesses of each topology were presented, compared and detailed by application-orientied analysis. Finally an optimal topology will be selected and experiment results obtained from experimental prototypes adopting the recommendation topologies confirm the validity and applicability of the proposed converter.
{"title":"A Comparative study of a family of ZVS dual switch flyback converters","authors":"Ping Rong, Wei Chen, Wei Zhang, Zheng-yu Lu","doi":"10.1109/IPEMC.2009.5157447","DOIUrl":"https://doi.org/10.1109/IPEMC.2009.5157447","url":null,"abstract":"in this paper, a family of ZVZCS dual switch flyback dc-dc converters were analyzed, which all feature soft-switching, low voltage stresses and good adaptability of wide range input. The main switches and auxiliary switch of these converters realize zero-voltage turning-on (ZVS) and the rectifier diode achieves zero-current turning-off (ZCS). They adopt different auxiliary circuit to realize soft-switching. The strengths and weaknesses of each topology were presented, compared and detailed by application-orientied analysis. Finally an optimal topology will be selected and experiment results obtained from experimental prototypes adopting the recommendation topologies confirm the validity and applicability of the proposed converter.","PeriodicalId":375971,"journal":{"name":"2009 IEEE 6th International Power Electronics and Motion Control Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130079166","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-05-17DOI: 10.1109/IPEMC.2009.5157548
J.J. Zhao, X. Li, J. Hao, C. Zhang, Jianfeng Lu
In recent years, the number of small size wind farms used as DG sources located within the distribution system are rapidly increasing. In this paper, wind farm made up with doubly fed induction generators (DFIG) is proposed as the continuous reactive power source to support system voltage control due to the reactive power control capability of DFIG. The particle swarm optimization (PSO) is utilized to find wind farm optimal reactive power output for distribution system losses reduction and voltage profiles improvement. Finally, the three feeder distribution system is used as a test case to evaluate the algorithm.
{"title":"Wind farm reactive power output optimization for loss reduction and voltage profile improvements","authors":"J.J. Zhao, X. Li, J. Hao, C. Zhang, Jianfeng Lu","doi":"10.1109/IPEMC.2009.5157548","DOIUrl":"https://doi.org/10.1109/IPEMC.2009.5157548","url":null,"abstract":"In recent years, the number of small size wind farms used as DG sources located within the distribution system are rapidly increasing. In this paper, wind farm made up with doubly fed induction generators (DFIG) is proposed as the continuous reactive power source to support system voltage control due to the reactive power control capability of DFIG. The particle swarm optimization (PSO) is utilized to find wind farm optimal reactive power output for distribution system losses reduction and voltage profiles improvement. Finally, the three feeder distribution system is used as a test case to evaluate the algorithm.","PeriodicalId":375971,"journal":{"name":"2009 IEEE 6th International Power Electronics and Motion Control Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123720483","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-05-17DOI: 10.1109/IPEMC.2009.5157752
Qi Zhang, Xiangdong Sun, Y. Zhong, M. Matsui
In centralized or string photovoltaic (PV) systems, PV modules must be connected in series in order to generate a sufficiently high voltage to avoid further amplification and to efficiently drive further converters. This always requires dozens of PV modules, however some of them maybe suffer from partial shadow caused by trees, clouds or other things. In this case, power generated from each PV module becomes unbalanced so that total output powers greatly decrease. Furthermore, hot-spot effect caused by partial shadow is likely to damage the PV cells and affect the security of PV system. In order to solve these problems, a novel topology of PV system composed of many series-connected PV modules with corresponding energy feedback circuits is proposed in this paper, a feedback circuit is independently utilized to feed the output energy of PV system to the corresponding circuit including shadowed PV module. The simulation and experimental results verify that the proposed topology can make each PV module operate on the maximum power point individually regardless of partial shadow. The energy feedback circuits do not operate without partial shadow, they have no power loss under this condition, therefore the circuit efficiency is improved.
{"title":"A novel topology for solving the partial shading problem in photovoltaic power generation system","authors":"Qi Zhang, Xiangdong Sun, Y. Zhong, M. Matsui","doi":"10.1109/IPEMC.2009.5157752","DOIUrl":"https://doi.org/10.1109/IPEMC.2009.5157752","url":null,"abstract":"In centralized or string photovoltaic (PV) systems, PV modules must be connected in series in order to generate a sufficiently high voltage to avoid further amplification and to efficiently drive further converters. This always requires dozens of PV modules, however some of them maybe suffer from partial shadow caused by trees, clouds or other things. In this case, power generated from each PV module becomes unbalanced so that total output powers greatly decrease. Furthermore, hot-spot effect caused by partial shadow is likely to damage the PV cells and affect the security of PV system. In order to solve these problems, a novel topology of PV system composed of many series-connected PV modules with corresponding energy feedback circuits is proposed in this paper, a feedback circuit is independently utilized to feed the output energy of PV system to the corresponding circuit including shadowed PV module. The simulation and experimental results verify that the proposed topology can make each PV module operate on the maximum power point individually regardless of partial shadow. The energy feedback circuits do not operate without partial shadow, they have no power loss under this condition, therefore the circuit efficiency is improved.","PeriodicalId":375971,"journal":{"name":"2009 IEEE 6th International Power Electronics and Motion Control Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132381193","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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