微网系统不平衡电压补偿控制策略
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摘要
微网系统中负荷不平衡会造成系统中电压的不平衡,影响微网系统的供电质量。针对这一问题,文中首先介绍了微网系统逆变器的控制方法,然后基于下垂控制,分析了微网系统电压不平衡的原因。为保证微网逆变器端口和公共耦合点电压能同时满足供电质量标准的要求,提出一种采用微网中储能逆变器对逆变器端口和微网公共耦合点不平衡电压进行同时补偿的控制策略,对所提补偿策略进行了详细的阐述,最后通过仿真和实验分析验证了所提方法的有效性。
Load unbalance in the microgrid can lead to voltage unbalance,which will reduce the power supply quality of the microgrid.To solve this problem,this paper firstly describes the microgrid inverter control method.Then the reason of voltage unbalance in the microgrid is analyzed based on the droop control.To ensure the voltage quality can meet the power supply standard requirements at the microgrid inverter output port and the point of common coupling,an energy storage inverter based unbalance voltage compensation method is proposed,which can simultaneously compensate the unbalance voltage at the inverter output port and the point of common coupling.The proposed strategy is described in details and its performance is verified by simulation in the MATLAB/Simulink software environment and the experiments on the microgrid experimental platform.
Load unbalance in the microgrid can lead to voltage unbalance,which will reduce the power supply quality of the microgrid.To solve this problem,this paper firstly describes the microgrid inverter control method.Then the reason of voltage unbalance in the microgrid is analyzed based on the droop control.To ensure the voltage quality can meet the power supply standard requirements at the microgrid inverter output port and the point of common coupling,an energy storage inverter based unbalance voltage compensation method is proposed,which can simultaneously compensate the unbalance voltage at the inverter output port and the point of common coupling.The proposed strategy is described in details and its performance is verified by simulation in the MATLAB/Simulink software environment and the experiments on the microgrid experimental platform.
引文
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[4]HAMZEH M,EMAMIAN S,KARIMI H.Robust control of an islanded microgrid under unbalanced and nonlinear load conditions[J].IEEE Journal of Emerging and Selected Topics in Power Electronics,2016,4(2):512-520.
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[14]CHENG P,CHEN C A,LEE T L,et al.A cooperative imbalance compensation method for distributed-generation interface converters[J].IEEE Trans on Industry Applications,2009,45(2):805-815.
[15]周洁,罗安,陈燕东,等.低压微电网多逆变器并联下的电压不平衡补偿方法[J].电网技术,2014,38(2):412-418.ZHOU Jie,LUO An,CHEN Yandong,et al.Voltage unbalance compensation for low-voltage microgrid with multi parallelly connected inverters[J].Power System Technology,2014,38(2):412-418.
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[17]HAMZEH M,KARIMI H,MOKHTARI H.A new control strategy for a multi-bus MV microgrid under unbalanced conditions[J].IEEE Trans on Power Systems,2012,27(4):2225-2232.
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[21]GUERRERO J M,VASQUEZ J C,MATAS J,et al.Hierarchical control of droop-controlled AC and DC microgrids—ageneral approach toward standardization[J].IEEE Trans on Industrial Electronics,2011,58(1):158-172.
[22]YU Xunwei,SHE Xu,NI Xijun,et al.System integration and hierarchical power management strategy for a solid-state transformer interfaced microgrid system[J].IEEE Trans on Power Electronics,2014,29(8):4414-4425.
[23]杨刚,杨奇逊,张涛,等.基于分层控制的多微网并网/解列运行控制策略[J].电力系统自动化,2016,40(5):96-101.DOI:10.7500/AEPS20150623005.YANG Gang,YANG Qixun,ZHANG Tao,et al.A control strategy for multi-microgrid connection/disconnection operation based on hierarchical control[J].Automation of Electric Power Systems,2016,40(5):96-101DOI:10.7500/AEPS20150623005.
[24]施永.微网系统逆变及组网关键技术研究[D].合肥:合肥工业大学,2015.
[25]HAMZEH M,KARIMI H,MOKHTARI H,et al.Control of a microgrid with unbalanced loads using virtual negativesequence impedance loop[C]//5th Power Electronics,Drive Systems and Technologies Conference(PEDSTC),February 5-6,2014,Tehran,Iran:78-83.
[2]KAWABATA Y,MAEKAWA T,KAWABATA T.Novel PLL systems which suffer little influence from voltage unbalance and distortion[J].Journal of the Japan Institute of Power Electronics,2010,35:354-359.
[3]MEERSMAN B,RENDERS B,DEGROOTE L,et al.The influence of grid-connected three-phase inverters on voltage unbalance[C]//IEEE Power and Energy Society General Meeting,July 25-29,2010,Minneapolis,USA:9p.
[4]HAMZEH M,EMAMIAN S,KARIMI H.Robust control of an islanded microgrid under unbalanced and nonlinear load conditions[J].IEEE Journal of Emerging and Selected Topics in Power Electronics,2016,4(2):512-520.
[5]IEEE recommended practice for monitoring electric power quality:IEEE Std 1159—2009(Revision of IEEE Std 1159-1995)[S].2009.
[6]中华人民共和国国家标准.电能质量-三相电压不平衡[S].2008.
[7]XU Y,TOLBERT L M,KUECK J D,et al.Voltage and current unbalance com-pensation using a static var compensator[J].IET Power Electronics,2010,3(6):977-988.
[8]GARCIA CAMPANHOL L B,OLIVEIRA D S S A,GOEDTEL A.Application of shunt active power filter for harmonic reduction and reactive power compensation in threephase four-wire systems[J].IET Power Electronics,2014,7(11):2825-2836.
[9]XU Y,KUECK J D,TOLBERT L M,et al.Voltage and current unbalance compensation using a parallel active filter[C]//38th IEEE Annual Power Electronics Specialists Conference(PESC),June 17-21,2007,Orlando,USA:2919-2925.
[10]董亮,李文可,温传新,等.链式STATCOM负序电流补偿能力分析[J].电力系统自动化,2015,39(23):132-138.DOI:10.7500/AEPS20150624009.DONG Liang,LI Wenke,WEN Chuanxin,et al.Analysis of negative sequence current compensation ability of STATCOM with cascade topologies[J].Automation of Electric Power Systems,2015,39(23):132-138.DOI:10.7500/AEPS20150624009.
[11]OE S P,CHRISTOPHER E,SUMNER M,et al.Microgrid unbalance compensator—mitigating the negative effects of unbalanced microgrid operation[C]//IEEE PES Innovative Smart Grid Technologies Conference Europe,October 6-9,2013,Lyngby,Denmark:5p.
[12]ZHOU Xiao,TANG Fen,LOH P C,et al.Four-leg converters with improved common current sharing and selective voltage-quality enhancement for islanded microgrids[J].IEEE Trans on Power Delivery,2016,31(2):522-531.
[13]SAVAGHEBI M,JALILIAN A,VASQUEZ J C.Autonomous voltage unbalance compensation in an islanded droop-controlled microgrid[J].IEEE Trans on Industrial Electronics,2013,60(4):1390-1402.
[14]CHENG P,CHEN C A,LEE T L,et al.A cooperative imbalance compensation method for distributed-generation interface converters[J].IEEE Trans on Industry Applications,2009,45(2):805-815.
[15]周洁,罗安,陈燕东,等.低压微电网多逆变器并联下的电压不平衡补偿方法[J].电网技术,2014,38(2):412-418.ZHOU Jie,LUO An,CHEN Yandong,et al.Voltage unbalance compensation for low-voltage microgrid with multi parallelly connected inverters[J].Power System Technology,2014,38(2):412-418.
[16]GOLSORKHI M S,LU D D.A decentralized control method for islanded microgrids under unbalanced conditions[J].IEEE Trans on Power Delivery,2016,31(3):1112-1121.
[17]HAMZEH M,KARIMI H,MOKHTARI H.A new control strategy for a multi-bus MV microgrid under unbalanced conditions[J].IEEE Trans on Power Systems,2012,27(4):2225-2232.
[18]SAVAGHEBI M,JALILIAN A,VASQUEZ J C,et al.Secondary control scheme for voltage unbalance compensation in an islanded droop-controlled microgrid[J].IEEE Trans on Smart Grid,2012,3(2):797-807.
[19]SHI Hongtao,ZHUO Fang,YI Hao,et al.Control strategy for microgrid under three-phase unbalance condition[J].Journal of Modern Power Systems and Clean Energy,2016,4(1):94-102.
[20]陈萌,肖湘宁.孤岛微电网分布式电压不平衡补偿控制策略[J].电力系统自动化,2017,41(8):45-51.DOI:10.7500/AEPS20161118001.CHEN Meng,XIAO Xiangning.Distributed control strategy for voltage unbalance compensation in islanded microgrid[J].Automation of Electric Power Systems,2017,41(8):45-51.DOI:10.7500/AEPS20161118001.
[21]GUERRERO J M,VASQUEZ J C,MATAS J,et al.Hierarchical control of droop-controlled AC and DC microgrids—ageneral approach toward standardization[J].IEEE Trans on Industrial Electronics,2011,58(1):158-172.
[22]YU Xunwei,SHE Xu,NI Xijun,et al.System integration and hierarchical power management strategy for a solid-state transformer interfaced microgrid system[J].IEEE Trans on Power Electronics,2014,29(8):4414-4425.
[23]杨刚,杨奇逊,张涛,等.基于分层控制的多微网并网/解列运行控制策略[J].电力系统自动化,2016,40(5):96-101.DOI:10.7500/AEPS20150623005.YANG Gang,YANG Qixun,ZHANG Tao,et al.A control strategy for multi-microgrid connection/disconnection operation based on hierarchical control[J].Automation of Electric Power Systems,2016,40(5):96-101DOI:10.7500/AEPS20150623005.
[24]施永.微网系统逆变及组网关键技术研究[D].合肥:合肥工业大学,2015.
[25]HAMZEH M,KARIMI H,MOKHTARI H,et al.Control of a microgrid with unbalanced loads using virtual negativesequence impedance loop[C]//5th Power Electronics,Drive Systems and Technologies Conference(PEDSTC),February 5-6,2014,Tehran,Iran:78-83.