Pub Date : 2012-06-25DOI: 10.1109/PEDG.2012.6254047
M. Mao, Shi-Ting Weng, Fuyang Liu, Liuchen Chang, M. Ding, Hongbin Wu
A novel control method based on the proportional resonant differential (PRD) control is proposed for the grid-connected current source inverter (CSI) used in the direct drive permanent magnet synchronous wind generation system. By the optimal design of the parameters of the PRD controller in two-phase stationary frame, the CSI system can realize zero steady-state error control and effectively damp the resonance caused by its output LC filter just by feeding back the grid-connected current. This not only greatly simplifies the controller design but also enhances the stability of the system. Simulation results show grid-connected CSI with this method has fast dynamic response and good steady-state performances.
{"title":"A novel PRD control method damping resonance in grid-connected three-phase SVPWM current source inverter","authors":"M. Mao, Shi-Ting Weng, Fuyang Liu, Liuchen Chang, M. Ding, Hongbin Wu","doi":"10.1109/PEDG.2012.6254047","DOIUrl":"https://doi.org/10.1109/PEDG.2012.6254047","url":null,"abstract":"A novel control method based on the proportional resonant differential (PRD) control is proposed for the grid-connected current source inverter (CSI) used in the direct drive permanent magnet synchronous wind generation system. By the optimal design of the parameters of the PRD controller in two-phase stationary frame, the CSI system can realize zero steady-state error control and effectively damp the resonance caused by its output LC filter just by feeding back the grid-connected current. This not only greatly simplifies the controller design but also enhances the stability of the system. Simulation results show grid-connected CSI with this method has fast dynamic response and good steady-state performances.","PeriodicalId":146438,"journal":{"name":"2012 3rd IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG)","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125156698","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 : 2012-06-25DOI: 10.1109/PEDG.2012.6253978
M. Savaghebi, J. Vasquez, A. Jalilian, Josep M. Guerrero
In this paper, a hierarchical control scheme is proposed for enhancement of Sensitive Load Bus (SLB) voltage quality in microgrids. The control structure consists of primary and secondary levels. The primary control level comprises Distributed Generators (DGs) local controllers. Each of these controllers includes a selective virtual impedance loop which is considered to improve sharing of fundamental and harmonic components of load current among the DG units. The sharing improvement is provided at the expense of increasing voltage unbalance and harmonic distortion. Thus, the secondary control level is applied to manage the compensation of SLB voltage unbalance and harmonics by sending proper control signals to the primary level. DGs compensation efforts are controlled locally at the primary level. The system design procedure for selecting proper control parameters is discussed. Simulation results are provided in order to demonstrate the effectiveness of the proposed control scheme.
{"title":"Secondary control for compensation of voltage harmonics and unbalance in microgrids","authors":"M. Savaghebi, J. Vasquez, A. Jalilian, Josep M. Guerrero","doi":"10.1109/PEDG.2012.6253978","DOIUrl":"https://doi.org/10.1109/PEDG.2012.6253978","url":null,"abstract":"In this paper, a hierarchical control scheme is proposed for enhancement of Sensitive Load Bus (SLB) voltage quality in microgrids. The control structure consists of primary and secondary levels. The primary control level comprises Distributed Generators (DGs) local controllers. Each of these controllers includes a selective virtual impedance loop which is considered to improve sharing of fundamental and harmonic components of load current among the DG units. The sharing improvement is provided at the expense of increasing voltage unbalance and harmonic distortion. Thus, the secondary control level is applied to manage the compensation of SLB voltage unbalance and harmonics by sending proper control signals to the primary level. DGs compensation efforts are controlled locally at the primary level. The system design procedure for selecting proper control parameters is discussed. Simulation results are provided in order to demonstrate the effectiveness of the proposed control scheme.","PeriodicalId":146438,"journal":{"name":"2012 3rd IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122551415","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 : 2012-06-25DOI: 10.1109/PEDG.2012.6254010
M. Rahiminejad, C. Diduch, M. Stevenson, Liuchen Chang
This paper proposes a detection method for open-circuit faults in a 3-phase uncontrolled rectifier that forms the input stage of a single-phase current controlled power converter. The rectifier is driven by a 3-phase wind generator with variable amplitude and frequency. The algorithm is based on fault signatures embedded within the output voltage ripple of the rectifier. It is demonstrated that seven different classes of open circuit faults can be detected and isolated.
{"title":"Open-circuit fault diagnosis in 3-phase uncontrolled rectifiers","authors":"M. Rahiminejad, C. Diduch, M. Stevenson, Liuchen Chang","doi":"10.1109/PEDG.2012.6254010","DOIUrl":"https://doi.org/10.1109/PEDG.2012.6254010","url":null,"abstract":"This paper proposes a detection method for open-circuit faults in a 3-phase uncontrolled rectifier that forms the input stage of a single-phase current controlled power converter. The rectifier is driven by a 3-phase wind generator with variable amplitude and frequency. The algorithm is based on fault signatures embedded within the output voltage ripple of the rectifier. It is demonstrated that seven different classes of open circuit faults can be detected and isolated.","PeriodicalId":146438,"journal":{"name":"2012 3rd IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122639373","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 : 2012-06-25DOI: 10.1109/PEDG.2012.6254033
Jie Zhang, R. Yokoyama, Jinhua She
One problem with a single-voltage source, three-level inverter is the drafting of its neutral-point voltage. This may occur during transition or when unbalanced loads are connected to the inverter system. Variation of neutral-point voltage may greatly deteriorate the power quality. In this paper, we employ an equivalent-input-disturbance approach to deal with this problem. By adding an extra neutral leg, the control problem of neutralpoint voltage is converted to a disturbance rejection problem. This method suppresses the variation of the neutral-point voltage to a small level and reduces the capacity of capacitors. Simulation results show the effectiveness of the method.
{"title":"Neutral-point voltage control for a three-level DC-AC inverter using equivalent-input-disturbance approach","authors":"Jie Zhang, R. Yokoyama, Jinhua She","doi":"10.1109/PEDG.2012.6254033","DOIUrl":"https://doi.org/10.1109/PEDG.2012.6254033","url":null,"abstract":"One problem with a single-voltage source, three-level inverter is the drafting of its neutral-point voltage. This may occur during transition or when unbalanced loads are connected to the inverter system. Variation of neutral-point voltage may greatly deteriorate the power quality. In this paper, we employ an equivalent-input-disturbance approach to deal with this problem. By adding an extra neutral leg, the control problem of neutralpoint voltage is converted to a disturbance rejection problem. This method suppresses the variation of the neutral-point voltage to a small level and reduces the capacity of capacitors. Simulation results show the effectiveness of the method.","PeriodicalId":146438,"journal":{"name":"2012 3rd IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG)","volume":"105 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124747270","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 : 2012-06-25DOI: 10.1109/PEDG.2012.6254041
Yen-Ching Wang, Tzung-Lin Lee
This paper presents a control strategy of hybrid active filter for compensation of the three-phase three-wire industrial power system considering unbalanced loading. In addition to harmonic current compensation, the hybrid filter is designed to compensate both positive- and negative-sequence reactive power based on the so-called instantaneous power theory. Therefore, the compensated system behaves as a resistive network even in a reactive, nonlinear, or unbalanced circuit. Theoretical analysis and experimental results are given to verify effectiveness of the proposed method.
{"title":"A control strategy of hybrid active filter to compensate unbalanced load in three-phase three-wire power system","authors":"Yen-Ching Wang, Tzung-Lin Lee","doi":"10.1109/PEDG.2012.6254041","DOIUrl":"https://doi.org/10.1109/PEDG.2012.6254041","url":null,"abstract":"This paper presents a control strategy of hybrid active filter for compensation of the three-phase three-wire industrial power system considering unbalanced loading. In addition to harmonic current compensation, the hybrid filter is designed to compensate both positive- and negative-sequence reactive power based on the so-called instantaneous power theory. Therefore, the compensated system behaves as a resistive network even in a reactive, nonlinear, or unbalanced circuit. Theoretical analysis and experimental results are given to verify effectiveness of the proposed method.","PeriodicalId":146438,"journal":{"name":"2012 3rd IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134165443","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 : 2012-06-25DOI: 10.1109/PEDG.2012.6253983
Wei-Chen Liu, Ming Chang, Tzu-Wei Yu, C. Moo
The aircraft obstacle lights on the power transmission towers, which are located at the places without the utility mains, are powered mainly by solar cells and subordinately by rechargeable batteries. The power supply with solar cells and batteries are configured and coordinated according to the weather conditions. The designed power capacities are to keep the aircraft obstacle lighting system uninterruptable either under the drastic weather variation or a long period of insufficient sunlight. An exemplar case is planned on the basis of the local weather data in recent 6 years. A more economical and precise planning is made for the capacities of solar cells and batteries. The design has demonstrated, through simulations, the feasibility and the accuracy in reality.
{"title":"Power planning for aircraft obstacle lighting","authors":"Wei-Chen Liu, Ming Chang, Tzu-Wei Yu, C. Moo","doi":"10.1109/PEDG.2012.6253983","DOIUrl":"https://doi.org/10.1109/PEDG.2012.6253983","url":null,"abstract":"The aircraft obstacle lights on the power transmission towers, which are located at the places without the utility mains, are powered mainly by solar cells and subordinately by rechargeable batteries. The power supply with solar cells and batteries are configured and coordinated according to the weather conditions. The designed power capacities are to keep the aircraft obstacle lighting system uninterruptable either under the drastic weather variation or a long period of insufficient sunlight. An exemplar case is planned on the basis of the local weather data in recent 6 years. A more economical and precise planning is made for the capacities of solar cells and batteries. The design has demonstrated, through simulations, the feasibility and the accuracy in reality.","PeriodicalId":146438,"journal":{"name":"2012 3rd IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129105255","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 : 2012-06-25DOI: 10.1109/PEDG.2012.6254086
F. Blaabjerg, A. Isidori, F. M. Rossi
This paper focuses on the control and modulation of a three-level Neutral Point Clamped (3L-NPC) back-to-back full scale converter for a 10 MW direct-drive wind turbine, equipped with a Permanent Magnet Synchronous Generator (PMSG). Emphasis is oriented towards the investigation of the power losses in the semiconductor devices of three-level converter adopting continuous and discontinuous PWM modulation strategies. This aspect strongly influences the operation of the converter and directly affects its efficiency. Therefore, a simulation platform is developed in Matlab/Simulink and PLECS environment to analyse the dynamics of the system using different kinds of modulation strategies, identifying which methods can improve the converter efficiency. It is concluded that 60° discontinuous PWM modulation strategies show less power losses in the semiconductor devices and will increase the overall efficiency of the converter.
{"title":"Impact of modulation strategies on power devices loading for 10 MW multilevel wind power converter","authors":"F. Blaabjerg, A. Isidori, F. M. Rossi","doi":"10.1109/PEDG.2012.6254086","DOIUrl":"https://doi.org/10.1109/PEDG.2012.6254086","url":null,"abstract":"This paper focuses on the control and modulation of a three-level Neutral Point Clamped (3L-NPC) back-to-back full scale converter for a 10 MW direct-drive wind turbine, equipped with a Permanent Magnet Synchronous Generator (PMSG). Emphasis is oriented towards the investigation of the power losses in the semiconductor devices of three-level converter adopting continuous and discontinuous PWM modulation strategies. This aspect strongly influences the operation of the converter and directly affects its efficiency. Therefore, a simulation platform is developed in Matlab/Simulink and PLECS environment to analyse the dynamics of the system using different kinds of modulation strategies, identifying which methods can improve the converter efficiency. It is concluded that 60° discontinuous PWM modulation strategies show less power losses in the semiconductor devices and will increase the overall efficiency of the converter.","PeriodicalId":146438,"journal":{"name":"2012 3rd IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG)","volume":"120 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116024049","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 : 2012-06-25DOI: 10.1109/PEDG.2012.6254025
I. T. Roman, L. S. Silva
This work presents a new power decoupling technique for grid-tied current-source inverter (CSI), in grid-connected photovoltaic (PV) systems. Single-phase converters have low-frequency power ripple in the dc-link. The proposed topology is intended to reduce the low frequency power ripple by using an active power filter (APF) on the dc-link, based on a bidirectional buck-boost converter, which provides compensating voltage in a very simple but effective way. The advantages of this configuration are: a) dc-link ripple minimization, b) passive components size reduction, c) improvement of maximum power point tracking (MPPT) performance; and d) compatibility with full range of CSI modulation index (0~1).
{"title":"A single-phase current-source inverter with active power filter for grid-tied PV systems","authors":"I. T. Roman, L. S. Silva","doi":"10.1109/PEDG.2012.6254025","DOIUrl":"https://doi.org/10.1109/PEDG.2012.6254025","url":null,"abstract":"This work presents a new power decoupling technique for grid-tied current-source inverter (CSI), in grid-connected photovoltaic (PV) systems. Single-phase converters have low-frequency power ripple in the dc-link. The proposed topology is intended to reduce the low frequency power ripple by using an active power filter (APF) on the dc-link, based on a bidirectional buck-boost converter, which provides compensating voltage in a very simple but effective way. The advantages of this configuration are: a) dc-link ripple minimization, b) passive components size reduction, c) improvement of maximum power point tracking (MPPT) performance; and d) compatibility with full range of CSI modulation index (0~1).","PeriodicalId":146438,"journal":{"name":"2012 3rd IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG)","volume":"30 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116334267","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 : 2012-06-25DOI: 10.1109/PEDG.2012.6253998
F. Yu, Ying Fan, M. Cheng, Guowen Hu
Islanding detection (ID) is a mandatory function for PV grid-connected converters. The traditional Sandia frequency shift method for ID becomes ineffective under certain parallel RLC loads. To alleviate this problem, a new methodology to optimize the frequency shift parameter Ks is proposed, and a novel non-detection zone (NDZ) mapping method is presented to map the NDZ influenced by each electrical parameter in this paper. An instability criterion relied on phase equilibrium principle algorithm is presented under specific loads to analyze the relationship between parameters and the reduction of NDZ. The proposed algorithm can keep the frequency of inverter output voltage deviating until the protection circuit is triggered with lower harmonic current. Single-phase photovoltaic grid-connected simulation system and experimental platform are constructed according to IEEE Std. 2000-929. Both the simulation and experimental results prove the robustness and effectiveness of the proposed parameter optimization algorithm.
{"title":"Parameter design optimization for Sandia frequency shift islanding detection method","authors":"F. Yu, Ying Fan, M. Cheng, Guowen Hu","doi":"10.1109/PEDG.2012.6253998","DOIUrl":"https://doi.org/10.1109/PEDG.2012.6253998","url":null,"abstract":"Islanding detection (ID) is a mandatory function for PV grid-connected converters. The traditional Sandia frequency shift method for ID becomes ineffective under certain parallel RLC loads. To alleviate this problem, a new methodology to optimize the frequency shift parameter Ks is proposed, and a novel non-detection zone (NDZ) mapping method is presented to map the NDZ influenced by each electrical parameter in this paper. An instability criterion relied on phase equilibrium principle algorithm is presented under specific loads to analyze the relationship between parameters and the reduction of NDZ. The proposed algorithm can keep the frequency of inverter output voltage deviating until the protection circuit is triggered with lower harmonic current. Single-phase photovoltaic grid-connected simulation system and experimental platform are constructed according to IEEE Std. 2000-929. Both the simulation and experimental results prove the robustness and effectiveness of the proposed parameter optimization algorithm.","PeriodicalId":146438,"journal":{"name":"2012 3rd IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121783017","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 : 2012-06-25DOI: 10.1109/PEDG.2012.6254045
Yongheng Yang, F. Blaabjerg
The highly increasing penetration of single-phase photovoltaic (PV) systems pushes the grid requirements related to the integration of PV power systems to be updated. These upcoming regulations are expected to direct the grid-connected renewable generators to support the grid operation and stability both under grid faulty conditions and under normal operations. Grid synchronization techniques play an important role in the control of single-phase systems in order to fulfill these demands. Thus, it is necessary to evaluate the behaviors of grid synchronization methods in single phase systems under grid faults. The focus of this paper is put on the benchmarking of synchronization techniques, mainly about phase locked loop (PLL) based methods, in single-phase PV power systems operating under grid faults. Some faulty mode cases are studied at the end of this paper in order to compare these methods. It is concluded that the Enhanced PLL (EPLL) and the Second Order Generalized Integrator based PLL (SOGI-OSG PLL) technique are the most promising candidates for future single-phase PV systems due to their fast adaptive-filtering characteristics.
{"title":"Synchronization in single-phase grid-connected photovoltaic systems under grid faults","authors":"Yongheng Yang, F. Blaabjerg","doi":"10.1109/PEDG.2012.6254045","DOIUrl":"https://doi.org/10.1109/PEDG.2012.6254045","url":null,"abstract":"The highly increasing penetration of single-phase photovoltaic (PV) systems pushes the grid requirements related to the integration of PV power systems to be updated. These upcoming regulations are expected to direct the grid-connected renewable generators to support the grid operation and stability both under grid faulty conditions and under normal operations. Grid synchronization techniques play an important role in the control of single-phase systems in order to fulfill these demands. Thus, it is necessary to evaluate the behaviors of grid synchronization methods in single phase systems under grid faults. The focus of this paper is put on the benchmarking of synchronization techniques, mainly about phase locked loop (PLL) based methods, in single-phase PV power systems operating under grid faults. Some faulty mode cases are studied at the end of this paper in order to compare these methods. It is concluded that the Enhanced PLL (EPLL) and the Second Order Generalized Integrator based PLL (SOGI-OSG PLL) technique are the most promising candidates for future single-phase PV systems due to their fast adaptive-filtering characteristics.","PeriodicalId":146438,"journal":{"name":"2012 3rd IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122064378","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：