Pub Date : 2012-06-25DOI: 10.1109/PEDG.2012.6254002
Wang Wei, Xue Lijie, Shidan Wang, Kong Jun, Geng Jing
Based on the improved genetic algorithm, the mathematical model of reactive power optimization for electric power distribution system integrating with distributed generation (DG) is proposed in this paper. The active power output of DG and the reactive power compensation position are added as control variable to analyze the influence to the reactive power optimization when DG connected to the system. The test system is a 33-bus electric power distribution system, and the simulation result shows that the method proposed in this paper is helpful in reducing power losses while improving the voltage profiles.
{"title":"Research on the reactive power optimization of distribution network including DG","authors":"Wang Wei, Xue Lijie, Shidan Wang, Kong Jun, Geng Jing","doi":"10.1109/PEDG.2012.6254002","DOIUrl":"https://doi.org/10.1109/PEDG.2012.6254002","url":null,"abstract":"Based on the improved genetic algorithm, the mathematical model of reactive power optimization for electric power distribution system integrating with distributed generation (DG) is proposed in this paper. The active power output of DG and the reactive power compensation position are added as control variable to analyze the influence to the reactive power optimization when DG connected to the system. The test system is a 33-bus electric power distribution system, and the simulation result shows that the method proposed in this paper is helpful in reducing power losses while improving the voltage profiles.","PeriodicalId":146438,"journal":{"name":"2012 3rd IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114301993","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.2012.6254044
U. Choi, K. B. Lee, F. Blaabjerg
This paper proposes a diagnosis method of an open-switch fault and fault-tolerant control algorithm for a grid-connected T-type three-level inverter. The location of the faulty switch is identified by using the changes of average phase current and the neutral-point voltage. The fault-tolerant control algorithm can be used when the open switch fault occurs in the middle switches. It is achieved by simply modifying the conventional SVM method. The proposed methods are advantageous as they do not require additional sensors and they do not involve complex calculations. Therefore, this method is cost-effective and industrial interesting. The simulation results confirm the feasibility and effectiveness of the proposed fault-diagnosis and tolerant methods.
{"title":"Diagnosis method of an open-switch fault for a grid-connected T-type three-level inverter system","authors":"U. Choi, K. B. Lee, F. Blaabjerg","doi":"10.1109/PEDG.2012.6254044","DOIUrl":"https://doi.org/10.1109/PEDG.2012.6254044","url":null,"abstract":"This paper proposes a diagnosis method of an open-switch fault and fault-tolerant control algorithm for a grid-connected T-type three-level inverter. The location of the faulty switch is identified by using the changes of average phase current and the neutral-point voltage. The fault-tolerant control algorithm can be used when the open switch fault occurs in the middle switches. It is achieved by simply modifying the conventional SVM method. The proposed methods are advantageous as they do not require additional sensors and they do not involve complex calculations. Therefore, this method is cost-effective and industrial interesting. The simulation results confirm the feasibility and effectiveness of the proposed fault-diagnosis and tolerant methods.","PeriodicalId":146438,"journal":{"name":"2012 3rd IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114724239","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.2012.6254011
Keliang Zhou, Fei Peng, M. Cheng
A two-stage high-frequency link inverter with active clamper, which has galvanic isolation, two-stage power conversion, bidirectional power flow, high efficiency, and high power density, is investigated in this paper. Modulation method and control strategy are developed for this inverter to achieve satisfactory system performance. Experiments are carried out to evaluate the proposed modulation and control strategy.
{"title":"Modulation and control of a two-stage single-phase high frequency link inverter","authors":"Keliang Zhou, Fei Peng, M. Cheng","doi":"10.1109/PEDG.2012.6254011","DOIUrl":"https://doi.org/10.1109/PEDG.2012.6254011","url":null,"abstract":"A two-stage high-frequency link inverter with active clamper, which has galvanic isolation, two-stage power conversion, bidirectional power flow, high efficiency, and high power density, is investigated in this paper. Modulation method and control strategy are developed for this inverter to achieve satisfactory system performance. Experiments are carried out to evaluate the proposed modulation and control strategy.","PeriodicalId":146438,"journal":{"name":"2012 3rd IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124244835","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.2012.6254055
G. Hsieh, Cheng-Yuan Tsai, Hung-I Hsieh
This paper presents a smart photovoltaic (PV) power-increment-aided incremental-conductance MPPT (PI-INC MPPT) using either variable-frequency constant-duty control (VFCD) or constant-frequency variable-duty control (CFVD). The tracking of PI-INC MPPT with reference to a threshold tracking zone (THZ) is implemented by a two-step approach, a power-increment (PI) coarse-tracking along Ppv-Vpv curve and an incremental-conductance (INC) fine-tracking along Ipv-Vpv curve. An ambiguous detection using INC MPPT, in the flat-and-low conductance region of Ipv-Vpv curve, will not be arisen by using the PI coarse-tracking that enriches the PI-INC MPPT fast tracking along Ppv-Vpv curve with obvious detection against the potential tracking delay. Modeling and analysis of two typical PV power converters, using VFCD and CFVD controls, which implement the tracking of the PI-INC MPPT, are respectively addressed. The effectiveness of the tracking behavior of PI-INC MPPT by the two power converters in comparison with that using conventional INC-MPPT is assessed through the experimental tests.
{"title":"Photovoltaic power-increment-aided incremental-conductance maximum power point tracking using variable frequency and duty controls","authors":"G. Hsieh, Cheng-Yuan Tsai, Hung-I Hsieh","doi":"10.1109/PEDG.2012.6254055","DOIUrl":"https://doi.org/10.1109/PEDG.2012.6254055","url":null,"abstract":"This paper presents a smart photovoltaic (PV) power-increment-aided incremental-conductance MPPT (PI-INC MPPT) using either variable-frequency constant-duty control (VFCD) or constant-frequency variable-duty control (CFVD). The tracking of PI-INC MPPT with reference to a threshold tracking zone (THZ) is implemented by a two-step approach, a power-increment (PI) coarse-tracking along Ppv-Vpv curve and an incremental-conductance (INC) fine-tracking along Ipv-Vpv curve. An ambiguous detection using INC MPPT, in the flat-and-low conductance region of Ipv-Vpv curve, will not be arisen by using the PI coarse-tracking that enriches the PI-INC MPPT fast tracking along Ppv-Vpv curve with obvious detection against the potential tracking delay. Modeling and analysis of two typical PV power converters, using VFCD and CFVD controls, which implement the tracking of the PI-INC MPPT, are respectively addressed. The effectiveness of the tracking behavior of PI-INC MPPT by the two power converters in comparison with that using conventional INC-MPPT is assessed through the experimental tests.","PeriodicalId":146438,"journal":{"name":"2012 3rd IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121616167","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.2012.6254008
A. Alexandridis, M. K. Bourdoulis
PWM-regulated ac/dc converters are of great importance in distributed power system applications since they are widely used to interface a variety of renewable power sources such as wind and photovoltaic generators with the grid. Furthermore, they provide special control possibilities of the active and reactive power. In this paper, a new stability analysis and design approach for nonlinear PI controllers for this kind of devices is proposed, based on the passivity analysis of the complete system. To this end, first the nonlinear model of the system is obtained, on which suitably modified PI controllers are incorporated. The analysis conducted provides a set of limits, rules and demands that should be satisfied in order to achieve fast, accurate and satisfactory responses. Furthermore, it is proven that, in all cases, a closed-loop system with desired damping is guaranteed while the controllers' dynamics drive the system at the reference values. The simulation results indicate the effectiveness of the controller design.
{"title":"PI controller design of grid-side PWM-regulated ac/dc converters via stability analysis based on passivity","authors":"A. Alexandridis, M. K. Bourdoulis","doi":"10.1109/PEDG.2012.6254008","DOIUrl":"https://doi.org/10.1109/PEDG.2012.6254008","url":null,"abstract":"PWM-regulated ac/dc converters are of great importance in distributed power system applications since they are widely used to interface a variety of renewable power sources such as wind and photovoltaic generators with the grid. Furthermore, they provide special control possibilities of the active and reactive power. In this paper, a new stability analysis and design approach for nonlinear PI controllers for this kind of devices is proposed, based on the passivity analysis of the complete system. To this end, first the nonlinear model of the system is obtained, on which suitably modified PI controllers are incorporated. The analysis conducted provides a set of limits, rules and demands that should be satisfied in order to achieve fast, accurate and satisfactory responses. Furthermore, it is proven that, in all cases, a closed-loop system with desired damping is guaranteed while the controllers' dynamics drive the system at the reference values. The simulation results indicate the effectiveness of the controller design.","PeriodicalId":146438,"journal":{"name":"2012 3rd IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124719077","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.2012.6253999
T. Wijnhoven, J. Tant, Geert Deconinck
Traditional fault calculation techniques are not capable of accurately modelling the short-circuit behaviour of inverter interfaced distributed generation (IIDG). As the share of IIDG continues to rise, more accurate fault simulations are required. This paper gives an overview of fault calculation techniques described in literature. All techniques are evaluated from the viewpoint of protection studies in medium and low voltage grids with a high share of IIDG. The averaged value modelling technique is selected. The merits of this technique are illustrated in a Simulink/PLECS simulation environment, where averaged value models are compared to full time-domain switched models in terms of simulation time and accuracy.
{"title":"Inverter modelling techniques for protection studies","authors":"T. Wijnhoven, J. Tant, Geert Deconinck","doi":"10.1109/PEDG.2012.6253999","DOIUrl":"https://doi.org/10.1109/PEDG.2012.6253999","url":null,"abstract":"Traditional fault calculation techniques are not capable of accurately modelling the short-circuit behaviour of inverter interfaced distributed generation (IIDG). As the share of IIDG continues to rise, more accurate fault simulations are required. This paper gives an overview of fault calculation techniques described in literature. All techniques are evaluated from the viewpoint of protection studies in medium and low voltage grids with a high share of IIDG. The averaged value modelling technique is selected. The merits of this technique are illustrated in a Simulink/PLECS simulation environment, where averaged value models are compared to full time-domain switched models in terms of simulation time and accuracy.","PeriodicalId":146438,"journal":{"name":"2012 3rd IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115755443","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.2012.6254064
Yugang Yang, Tao Li, Jianjia Liu, Hai-yang Li
It is a difficult work to design a large power energy storage inductor in bidirectional DC/DC converter. In order to overcome this difficulty, this paper studied the interleaving magnetic integration theory of bidirectional DC/DC converter. In which all the 4-phase inductors in 4-phase Buck+Boost bidirectional DC/DC converter were interleaving magnetic integrated with two 2-phase coupled inductors. The steady state phase current ripple and transient phase current response speed in Buck mode of the interleaving magnetic integrated bidirectional DC/DC converter were studied deeply, and the design criterion of the bidirectional DC/DC converter was given. Finally, the theory was verified with simulation and experimental results.
{"title":"A comprehensive analysis of coupled inductors in 4 phases interleaving bidirectional DC/DC converter","authors":"Yugang Yang, Tao Li, Jianjia Liu, Hai-yang Li","doi":"10.1109/PEDG.2012.6254064","DOIUrl":"https://doi.org/10.1109/PEDG.2012.6254064","url":null,"abstract":"It is a difficult work to design a large power energy storage inductor in bidirectional DC/DC converter. In order to overcome this difficulty, this paper studied the interleaving magnetic integration theory of bidirectional DC/DC converter. In which all the 4-phase inductors in 4-phase Buck+Boost bidirectional DC/DC converter were interleaving magnetic integrated with two 2-phase coupled inductors. The steady state phase current ripple and transient phase current response speed in Buck mode of the interleaving magnetic integrated bidirectional DC/DC converter were studied deeply, and the design criterion of the bidirectional DC/DC converter was given. Finally, the theory was verified with simulation and experimental results.","PeriodicalId":146438,"journal":{"name":"2012 3rd IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125812678","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.2012.6254078
G. Bergna, J. Vannier, P. Lefranc, A. Arzande, E. Berne, P. Egrot, M. Molinas
This work consists of the presentation of a regulation strategy capable of controlling the energy stored in the DC capacitors of the upper and lower arms of a Modular Multilevel Converter (MMC) for each phase. This is achieved by regulating the positive, negative and zero sequences in dqo coordinates of the differential current using a rotating reference frame at twice the fundamental value. Active and reactive components of the differential current are used to eliminate the oscillations of the three-phased leg-energy which reduces significantly the capacitor voltage oscillations, while the zero sequence component is used to regulate the whole system energy at a given value. All feed-forwards equations are demonstrated, and cross-coupled leg-energy terms are introduced.
{"title":"Modular Multilevel Converter leg-energy controller in rotating reference frame for voltage oscillations reduction","authors":"G. Bergna, J. Vannier, P. Lefranc, A. Arzande, E. Berne, P. Egrot, M. Molinas","doi":"10.1109/PEDG.2012.6254078","DOIUrl":"https://doi.org/10.1109/PEDG.2012.6254078","url":null,"abstract":"This work consists of the presentation of a regulation strategy capable of controlling the energy stored in the DC capacitors of the upper and lower arms of a Modular Multilevel Converter (MMC) for each phase. This is achieved by regulating the positive, negative and zero sequences in dqo coordinates of the differential current using a rotating reference frame at twice the fundamental value. Active and reactive components of the differential current are used to eliminate the oscillations of the three-phased leg-energy which reduces significantly the capacitor voltage oscillations, while the zero sequence component is used to regulate the whole system energy at a given value. All feed-forwards equations are demonstrated, and cross-coupled leg-energy terms are introduced.","PeriodicalId":146438,"journal":{"name":"2012 3rd IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125951980","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.2012.6253989
H. E. Fadil, F. Giri, Josep M. Guerrero
The problem of controlling single-phase grid connected photovoltaic (PV) system is considered. The control objective is fourfold: (i) asymptotic stability of the closed loop system, (ii) maximum power point tracking (MPPT) of PV module (iii) tight regulation of the DC bus voltage, and (iv) unity power factor (PF) in the grid. A nonlinear controller is developed using the backstepping design technique based on an averaged nonlinear model of the whole controlled system. The model accounts, on the one hand, for the nonlinear dynamics of the underlying boost converter and inverter and, on the other, for the nonlinear characteristic of PV panel. It is formally shown, through theoretical analysis and simulation results, that the proposed controller does achieve its objectives.
{"title":"Grid-connected of photovoltaic module using nonlinear control","authors":"H. E. Fadil, F. Giri, Josep M. Guerrero","doi":"10.1109/PEDG.2012.6253989","DOIUrl":"https://doi.org/10.1109/PEDG.2012.6253989","url":null,"abstract":"The problem of controlling single-phase grid connected photovoltaic (PV) system is considered. The control objective is fourfold: (i) asymptotic stability of the closed loop system, (ii) maximum power point tracking (MPPT) of PV module (iii) tight regulation of the DC bus voltage, and (iv) unity power factor (PF) in the grid. A nonlinear controller is developed using the backstepping design technique based on an averaged nonlinear model of the whole controlled system. The model accounts, on the one hand, for the nonlinear dynamics of the underlying boost converter and inverter and, on the other, for the nonlinear characteristic of PV panel. It is formally shown, through theoretical analysis and simulation results, that the proposed controller does achieve its objectives.","PeriodicalId":146438,"journal":{"name":"2012 3rd IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128097461","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.2012.6253980
Ying Zhu, M. Cheng, W. Hua
This paper proposes a sensorless maximum power point tracking (MPPT) strategy for dual power flow wind energy conversion system (WECS) based on electrical variable transmission (EVT). The outer rotor torque of the EVT is suitably controlled according to the outer rotor speed to realize the MPPT without the knowledge of wind velocity. Moreover, the model reference adaptive system (MRAS) observers are adopted to observe the outer rotor speed and position. Therefore, the proposed wind energy conversion system is controlled without physical sensors such as wind speed sensor and position sensor. Both the normal and the simplified MRAS observers are analyzed and the performance of each observer is compared. The simulation models are built based on Matlab/Simulink, and the simulation results validate the feasibility and effectiveness of the sensorless MPPT control of the proposed system.
{"title":"Sensorless maximum power point tracking in dual power flow wind energy conversion system","authors":"Ying Zhu, M. Cheng, W. Hua","doi":"10.1109/PEDG.2012.6253980","DOIUrl":"https://doi.org/10.1109/PEDG.2012.6253980","url":null,"abstract":"This paper proposes a sensorless maximum power point tracking (MPPT) strategy for dual power flow wind energy conversion system (WECS) based on electrical variable transmission (EVT). The outer rotor torque of the EVT is suitably controlled according to the outer rotor speed to realize the MPPT without the knowledge of wind velocity. Moreover, the model reference adaptive system (MRAS) observers are adopted to observe the outer rotor speed and position. Therefore, the proposed wind energy conversion system is controlled without physical sensors such as wind speed sensor and position sensor. Both the normal and the simplified MRAS observers are analyzed and the performance of each observer is compared. The simulation models are built based on Matlab/Simulink, and the simulation results validate the feasibility and effectiveness of the sensorless MPPT control of the proposed system.","PeriodicalId":146438,"journal":{"name":"2012 3rd IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127355494","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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