Pub Date : 2012-06-25DOI: 10.1109/PEDG.2012.6254024
G. Petrone, M. Vitelli, G. Spagnuolo
In this paper a simple digital implementation of one cycle control for the driving of a bidirectional three-phase back-to-back inverter is discussed. Such a digital implementation has been simulated in both grid-connected and stand alone configuration and the achieved performances have been compared with the corresponding ones obtained by adopting the standard analog implementation of one cycle control. The digital version preserves the same dynamic performances of the analog one even in presence of abrupt variations in the input current and during the transitions from grid-connected to stand-alone operating mode. The simulation results allow to assess the validity and the applicability of the proposed digital architecture in low cost microcontroller.
{"title":"Digital implementation of one cycle control in back to back converters","authors":"G. Petrone, M. Vitelli, G. Spagnuolo","doi":"10.1109/PEDG.2012.6254024","DOIUrl":"https://doi.org/10.1109/PEDG.2012.6254024","url":null,"abstract":"In this paper a simple digital implementation of one cycle control for the driving of a bidirectional three-phase back-to-back inverter is discussed. Such a digital implementation has been simulated in both grid-connected and stand alone configuration and the achieved performances have been compared with the corresponding ones obtained by adopting the standard analog implementation of one cycle control. The digital version preserves the same dynamic performances of the analog one even in presence of abrupt variations in the input current and during the transitions from grid-connected to stand-alone operating mode. The simulation results allow to assess the validity and the applicability of the proposed digital architecture in low cost microcontroller.","PeriodicalId":146438,"journal":{"name":"2012 3rd IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG)","volume":"16 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":"132707511","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.2012.6254080
M. Patsalides, G. Georghiou, A. Stavrou, V. Efthimiou
In recent years, increasing concerns about climate change and the liberalisation of energy market have provided the necessary impetus for a revolutionary restructuring of the electricity network at every level, namely production, transmission and distribution. Increased electricity production from renewable energy sources (RES) coupled with energy efficiency lie at the heart of the ambitious targets set by Europe in the quest to curb greenhouse gas emissions and to reach energy sustainability. Therefore the security and stability of the power system should be considered carefully to identify possible impacts due to uncontrolled deployment of RES. This paper focuses on the study of varying concentrations of photovoltaic (PV) systems on a proposed electricity grid in an attempt to assess the power quality response of the power system. The study has been performed using a detailed PV system model. The model is initially validated using data from the output of PV systems and then this is used for the study of varying PV penetrations on common distribution system topologies. The results are compared to international power quality standards.
{"title":"Assessing the power quality behaviour of high photovoltaic (PV) penetration levels inside the distribution network","authors":"M. Patsalides, G. Georghiou, A. Stavrou, V. Efthimiou","doi":"10.1109/PEDG.2012.6254080","DOIUrl":"https://doi.org/10.1109/PEDG.2012.6254080","url":null,"abstract":"In recent years, increasing concerns about climate change and the liberalisation of energy market have provided the necessary impetus for a revolutionary restructuring of the electricity network at every level, namely production, transmission and distribution. Increased electricity production from renewable energy sources (RES) coupled with energy efficiency lie at the heart of the ambitious targets set by Europe in the quest to curb greenhouse gas emissions and to reach energy sustainability. Therefore the security and stability of the power system should be considered carefully to identify possible impacts due to uncontrolled deployment of RES. This paper focuses on the study of varying concentrations of photovoltaic (PV) systems on a proposed electricity grid in an attempt to assess the power quality response of the power system. The study has been performed using a detailed PV system model. The model is initially validated using data from the output of PV systems and then this is used for the study of varying PV penetrations on common distribution system topologies. The results are compared to international power quality standards.","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":"131000129","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.2012.6254065
V. Khadkikar, R. Varma, R. Seethapathy, Ambrish Chandra, Hatem H. Zeineldin
In this paper, the impact of large-scale penetration of distributed generation (DG) system in the presence of non-linear loads is addressed. The effect of different DG penetration levels on the grid side current harmonics is examined. It is found that current harmonics generated by downstream non-linear loads with a TDD (total demand distortion) that is compliant with IEEE Standards can lead to significantly high THD (total harmonic distortion) values at the grid side under certain loading scenarios. These low magnitude highly distorted currents may cause protection circuitry and grid-synchronizing circuitry malfunctioning, and may even cause a resonance condition with power factor correction capacitor on the network. This paper further presents a control application of Photovoltaic (PV) solar plant based DG inverter o mitigate the above harmonics problem. The increased harmonic level issue and the application of PV solar plant to mitigate such problem have been demonstrated both by MATLAB/ SIMULINK simulation studies and laboratory experimental results.
{"title":"Impact of distributed generation penetration on grid current harmonics considering non-linear loads","authors":"V. Khadkikar, R. Varma, R. Seethapathy, Ambrish Chandra, Hatem H. Zeineldin","doi":"10.1109/PEDG.2012.6254065","DOIUrl":"https://doi.org/10.1109/PEDG.2012.6254065","url":null,"abstract":"In this paper, the impact of large-scale penetration of distributed generation (DG) system in the presence of non-linear loads is addressed. The effect of different DG penetration levels on the grid side current harmonics is examined. It is found that current harmonics generated by downstream non-linear loads with a TDD (total demand distortion) that is compliant with IEEE Standards can lead to significantly high THD (total harmonic distortion) values at the grid side under certain loading scenarios. These low magnitude highly distorted currents may cause protection circuitry and grid-synchronizing circuitry malfunctioning, and may even cause a resonance condition with power factor correction capacitor on the network. This paper further presents a control application of Photovoltaic (PV) solar plant based DG inverter o mitigate the above harmonics problem. The increased harmonic level issue and the application of PV solar plant to mitigate such problem have been demonstrated both by MATLAB/ SIMULINK simulation studies and laboratory experimental results.","PeriodicalId":146438,"journal":{"name":"2012 3rd IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG)","volume":"70 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":"121192335","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.2012.6254092
M. S. Reza, M. Ciobotaru, V. Agelidis
This paper presents the comparison of results between the singular value decomposition (SVD) and the least square (LS) techniques and also proposes the application of the SVD technique for extracting the parameters of the grid voltage waveform. With a small size window, the proposed SVD technique can extract amplitudes and phase angles of all the frequency components present in the Prony modelled grid voltage waveform more accurately than the LS technique. Moreover, the proposed technique has the ability to estimate the grid voltage parameters accurately from the singular matrix, where the LS technique fails. The SVD technique is applied on the Vandermonde matrix formed by the known damping factors and frequencies of the Prony modelled grid voltage waveform in order to estimate the amplitudes and phase angles. Moreover, an algorithm, which avoids the rooting of higher order polynomial, is presented to estimate the unknown harmonic frequencies from the harmonically distorted grid voltage waveform, where the fundamental frequency is estimated from a predicted fundamental frequency variation zone. Synthetically generated grid voltage waveforms are used in MATLAB to depict the superior performance of the proposed SVD technique over the LS technique.
{"title":"Accurate estimation of grid voltage parameters using singular value decomposition technique","authors":"M. S. Reza, M. Ciobotaru, V. Agelidis","doi":"10.1109/PEDG.2012.6254092","DOIUrl":"https://doi.org/10.1109/PEDG.2012.6254092","url":null,"abstract":"This paper presents the comparison of results between the singular value decomposition (SVD) and the least square (LS) techniques and also proposes the application of the SVD technique for extracting the parameters of the grid voltage waveform. With a small size window, the proposed SVD technique can extract amplitudes and phase angles of all the frequency components present in the Prony modelled grid voltage waveform more accurately than the LS technique. Moreover, the proposed technique has the ability to estimate the grid voltage parameters accurately from the singular matrix, where the LS technique fails. The SVD technique is applied on the Vandermonde matrix formed by the known damping factors and frequencies of the Prony modelled grid voltage waveform in order to estimate the amplitudes and phase angles. Moreover, an algorithm, which avoids the rooting of higher order polynomial, is presented to estimate the unknown harmonic frequencies from the harmonically distorted grid voltage waveform, where the fundamental frequency is estimated from a predicted fundamental frequency variation zone. Synthetically generated grid voltage waveforms are used in MATLAB to depict the superior performance of the proposed SVD technique over the LS technique.","PeriodicalId":146438,"journal":{"name":"2012 3rd IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG)","volume":"45 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":"115858624","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.2012.6254039
K. S. Parlak, H. Can
Maximum power point tracking (MPPT) algorithms are among the most important research topics related to photovoltaic (PV) systems. Conventional MPPT methods yield effective results that are easy to perform under uniform irradiation conditions. However, as more than one local maxima is formed under partial shading conditions, these methods fall short of being successful. Even though there are MPPT methods cited in the literature that work accurately under these conditions, they are dependent on complex calculations or panel parameters. This study proposes a new method that finds the real MPP of the PV array under partially shaded conditions. This method is based on the principle of scanning the P-V curve obtained by sensing the current and voltage values of a capacitor connected to the output of the PV array within charging time. The proposed method was tested in the Matlab-Simulink environment, in a simulation performed under partially shaded conditions and successful results were obtained.
{"title":"A new MPPT method for PV array system under partially shaded conditions","authors":"K. S. Parlak, H. Can","doi":"10.1109/PEDG.2012.6254039","DOIUrl":"https://doi.org/10.1109/PEDG.2012.6254039","url":null,"abstract":"Maximum power point tracking (MPPT) algorithms are among the most important research topics related to photovoltaic (PV) systems. Conventional MPPT methods yield effective results that are easy to perform under uniform irradiation conditions. However, as more than one local maxima is formed under partial shading conditions, these methods fall short of being successful. Even though there are MPPT methods cited in the literature that work accurately under these conditions, they are dependent on complex calculations or panel parameters. This study proposes a new method that finds the real MPP of the PV array under partially shaded conditions. This method is based on the principle of scanning the P-V curve obtained by sensing the current and voltage values of a capacitor connected to the output of the PV array within charging time. The proposed method was tested in the Matlab-Simulink environment, in a simulation performed under partially shaded conditions and successful results were obtained.","PeriodicalId":146438,"journal":{"name":"2012 3rd IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG)","volume":"225 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":"116399833","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.2012.6254102
Y. Omagari, T. Funaki
In this study, we investigate the transient stability criteria for an inverter-based distributed generator (DG) connected to an infinite bus system. The DG system is first compared and contrasted with the synchronous generator (SG) system using their mathematical expressions. The differential equations of the two systems that govern the frequency and phase of the generator output are similar. On the other hand, the effects of the DG and SG control systems on the generator behavior are different because of the difference in the response time of the control systems. The numerical experiment results show that the stability criteria of the DG system have different characteristics from that of the SG system.
{"title":"Numerical study of transient stability criteria for an inverter-based distributed generator","authors":"Y. Omagari, T. Funaki","doi":"10.1109/PEDG.2012.6254102","DOIUrl":"https://doi.org/10.1109/PEDG.2012.6254102","url":null,"abstract":"In this study, we investigate the transient stability criteria for an inverter-based distributed generator (DG) connected to an infinite bus system. The DG system is first compared and contrasted with the synchronous generator (SG) system using their mathematical expressions. The differential equations of the two systems that govern the frequency and phase of the generator output are similar. On the other hand, the effects of the DG and SG control systems on the generator behavior are different because of the difference in the response time of the control systems. The numerical experiment results show that the stability criteria of the DG system have different characteristics from that of the SG system.","PeriodicalId":146438,"journal":{"name":"2012 3rd IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG)","volume":"84 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":"126230120","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.2012.6254066
X. Zhou, Jiangang Liang, Wenshan Zhou, Xinmin Jin, Yibin Tong, R. Cai
With the high penetration of distributed generations (DG) in low voltage (LV) distribution network, some power quality problems, such as harmonic impacts due to power electronics converters, are unavoidable. This paper analyzes the harmonic influence caused by DG inverters to the connection points and to other nodes in the network. The LV distribution network model with DG inverters is established by MATLAB/Simulink. And simulation results verify the analysis. Power quality issues of connection point when multiple DG inverters connected to LV network are presented in field measurements and some related problems are discussed.
{"title":"Harmonic impacts of inverter-based distributed generations in low voltage distribution network","authors":"X. Zhou, Jiangang Liang, Wenshan Zhou, Xinmin Jin, Yibin Tong, R. Cai","doi":"10.1109/PEDG.2012.6254066","DOIUrl":"https://doi.org/10.1109/PEDG.2012.6254066","url":null,"abstract":"With the high penetration of distributed generations (DG) in low voltage (LV) distribution network, some power quality problems, such as harmonic impacts due to power electronics converters, are unavoidable. This paper analyzes the harmonic influence caused by DG inverters to the connection points and to other nodes in the network. The LV distribution network model with DG inverters is established by MATLAB/Simulink. And simulation results verify the analysis. Power quality issues of connection point when multiple DG inverters connected to LV network are presented in field measurements and some related problems are discussed.","PeriodicalId":146438,"journal":{"name":"2012 3rd IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG)","volume":"18 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":"125243275","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.2012.6254038
J. Sjolte, G. Tjensvoll, M. Molinas
Wave Energy Converters (WECs) with direct electric Power Take Off systems have large fluctuations in output power, and have a peak to average power ratio far above most other energy producers. Moreover, the typical average power production from a WEC is lower than that of other power plants, typically less than 1 MW. Array connection of several WECs can mitigate these shortcomings by increasing both the power output and quality. The focus of this paper is to analyze Fred. Olsen designed WEC system Bolt 2 Wavehub and the effect of expanding to a small array. The required specifications for the array geometry, the electrical configuration and the overall system are discussed and a specific array design consisting of 7 WECs is suggested as a solution and analyzed in detail. The results show that the peak to average power ratio can be reduced by a factor of 4 if the array covers a full wave length.
{"title":"All-electric wave energy converter connected in array with common DC-link for improved power quality","authors":"J. Sjolte, G. Tjensvoll, M. Molinas","doi":"10.1109/PEDG.2012.6254038","DOIUrl":"https://doi.org/10.1109/PEDG.2012.6254038","url":null,"abstract":"Wave Energy Converters (WECs) with direct electric Power Take Off systems have large fluctuations in output power, and have a peak to average power ratio far above most other energy producers. Moreover, the typical average power production from a WEC is lower than that of other power plants, typically less than 1 MW. Array connection of several WECs can mitigate these shortcomings by increasing both the power output and quality. The focus of this paper is to analyze Fred. Olsen designed WEC system Bolt 2 Wavehub and the effect of expanding to a small array. The required specifications for the array geometry, the electrical configuration and the overall system are discussed and a specific array design consisting of 7 WECs is suggested as a solution and analyzed in detail. The results show that the peak to average power ratio can be reduced by a factor of 4 if the array covers a full wave length.","PeriodicalId":146438,"journal":{"name":"2012 3rd IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG)","volume":"41 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":"127115350","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.2012.6254023
S. Essakiappan, H. Krishnamoorthy, P. Enjeti, R. Balog, S. Ahmed
In this paper, a new control strategy for megawatt scale multilevel photovoltaic (PV) inverters under partial shading is proposed. In the proposed system, the photovoltaic arrays are divided into zones and each zone is connected to DC to AC inverter. The DC to AC inverters of multiple zones are connected in series to form the required medium voltage and transfer power to the grid. In such a system where all zones are uniformly illuminated, the output voltage vectors of all the inverters are of equal magnitude and in phase with each other. However, under partial shading, the output voltage magnitude and phase angles of individual DC to AC inverters need to be adjusted in such a way that the available real power is transferred to the grid and the power factor of the overall system is as close to unity as possible. A control strategy is developed to operate the series connected multilevel inverter configuration under partial shading, by continuously monitoring the real and reactive powers supplied by each inverter. The developed strategy does not require a central controller and/or communications between the various DC to AC inverter blocks. The proposed control strategy is simulated for a 6.6 kV, three phase utility scale PV system rated at 5 MW.
{"title":"A new control strategy for megawatt scale multilevel photovoltaic inverters under partial shading","authors":"S. Essakiappan, H. Krishnamoorthy, P. Enjeti, R. Balog, S. Ahmed","doi":"10.1109/PEDG.2012.6254023","DOIUrl":"https://doi.org/10.1109/PEDG.2012.6254023","url":null,"abstract":"In this paper, a new control strategy for megawatt scale multilevel photovoltaic (PV) inverters under partial shading is proposed. In the proposed system, the photovoltaic arrays are divided into zones and each zone is connected to DC to AC inverter. The DC to AC inverters of multiple zones are connected in series to form the required medium voltage and transfer power to the grid. In such a system where all zones are uniformly illuminated, the output voltage vectors of all the inverters are of equal magnitude and in phase with each other. However, under partial shading, the output voltage magnitude and phase angles of individual DC to AC inverters need to be adjusted in such a way that the available real power is transferred to the grid and the power factor of the overall system is as close to unity as possible. A control strategy is developed to operate the series connected multilevel inverter configuration under partial shading, by continuously monitoring the real and reactive powers supplied by each inverter. The developed strategy does not require a central controller and/or communications between the various DC to AC inverter blocks. The proposed control strategy is simulated for a 6.6 kV, three phase utility scale PV system rated at 5 MW.","PeriodicalId":146438,"journal":{"name":"2012 3rd IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG)","volume":"21 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":"127344228","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.2012.6254087
Weimin Wu, Min Huang, Yunjie Sun, Xiongfei Wang, F. Blaabjerg
This paper investigates the maximum and the minimum gain of the proportional resonant based grid current controller for a grid-tied inverter with a passive damped high-order power filter. It is found that the choice of the controller gain is limited to the local maximum amplitude determined by Q-factor around the characteristic frequency of the filter and grid impedance. To obtain the Q-factor of a high-order system, an equivalent circuit analysis method is proposed and illustrated through several classical passive damped LCL- and LLCL-filters. It is shown that both the RC parallel damper that is in parallel with the capacitor of the LCL-filter or with the Lf-Cf resonant circuit of the LLCL-filter, and the RL series damper in series with the grid-side inductor have their own application limits. Thus, a composite passive damped LLCL-filter for the grid-tied inverter is proposed, which can effectively suppress the possible resonance in case that the grid impedance varies in a wide range. Simulation results are good agreement with the theoretical analysis.
{"title":"A composite passive damping method of the LLCL-filter based grid-tied inverter","authors":"Weimin Wu, Min Huang, Yunjie Sun, Xiongfei Wang, F. Blaabjerg","doi":"10.1109/PEDG.2012.6254087","DOIUrl":"https://doi.org/10.1109/PEDG.2012.6254087","url":null,"abstract":"This paper investigates the maximum and the minimum gain of the proportional resonant based grid current controller for a grid-tied inverter with a passive damped high-order power filter. It is found that the choice of the controller gain is limited to the local maximum amplitude determined by Q-factor around the characteristic frequency of the filter and grid impedance. To obtain the Q-factor of a high-order system, an equivalent circuit analysis method is proposed and illustrated through several classical passive damped LCL- and LLCL-filters. It is shown that both the RC parallel damper that is in parallel with the capacitor of the LCL-filter or with the Lf-Cf resonant circuit of the LLCL-filter, and the RL series damper in series with the grid-side inductor have their own application limits. Thus, a composite passive damped LLCL-filter for the grid-tied inverter is proposed, which can effectively suppress the possible resonance in case that the grid impedance varies in a wide range. Simulation results are good agreement with the theoretical analysis.","PeriodicalId":146438,"journal":{"name":"2012 3rd IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG)","volume":"71 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":"128595989","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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