电网故障下的电能路由器直流电容电压平衡控制策略
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摘要
针对传统方法无法实现电网故障下的电能路由器直流电容电压平衡问题,文中提出了三层结构的直流电容电压平衡控制策略。在对不平衡的功率进行理论分析的基础上,通过动态调整定义的加权系数,来灵活控制注入的零序电压和负序电流各自承担的相间移动功率,提高系统控制自由度。在MATLAB/Simulink环境下搭建电能路由器仿真平台,仿真结果表明:当某一相电网故障(电网电压跌落95%)时,采用单一的零序电压、零序电压和负序电流加权组合、单一的负序电流的注入均可实现电能路由器直流电容电压平衡控制目标。
A three-layer voltage balancing control strategy for DC capacitor is proposed to solve the DC capacitor voltage unbalance problem of electrical energy router under power grid failure.Based on the theoretical analysis of the unbalance power,the injection of zero-sequence voltage and negative-sequence current can flexibly share the responsibility of inter-phase unbalance power by dynamically adjusting the defined weighting coefficient,which improves the control freedom of the system.The simulation platform of electrical energy router is established in MATLAB/Simulink.The simulation results show that,when a single-phase failure(95% grid-voltage sag)occurs,the voltage balancing control goal of DC capacitor in electrical energy router can be achieved by independently using the injections of the single zero-sequence voltage,the weighted integration of zerosequence voltage and negative-sequence current,or the single negative-sequence current.
A three-layer voltage balancing control strategy for DC capacitor is proposed to solve the DC capacitor voltage unbalance problem of electrical energy router under power grid failure.Based on the theoretical analysis of the unbalance power,the injection of zero-sequence voltage and negative-sequence current can flexibly share the responsibility of inter-phase unbalance power by dynamically adjusting the defined weighting coefficient,which improves the control freedom of the system.The simulation platform of electrical energy router is established in MATLAB/Simulink.The simulation results show that,when a single-phase failure(95% grid-voltage sag)occurs,the voltage balancing control goal of DC capacitor in electrical energy router can be achieved by independently using the injections of the single zero-sequence voltage,the weighted integration of zerosequence voltage and negative-sequence current,or the single negative-sequence current.
引文
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[18]王杉杉,王玉斌,林意斐,等.级联型电力电子变压器电压与功率均衡控制方法[J].电工技术学报,2016,31(22):92-99.WANG Shanshan,WANG Yubin,LIN Yifei,et al.Voltage and power balance control for cascaded multilevel converter based power electronic transformer[J].Transactions of China Electrotechnical Society,2016,31(22):92-99.
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[20]申科,王建赜,班明飞,等.基于零序电压注入的模块化多电平变流器故障容错控制[J].电力系统自动化,2014,38(5):96-102.DOI:10.7500/AEPS201210276.SHEN Ke,WANG Jianze,BAN Mingfei,et al.Fault-tolerant control for modular multilevel converter based on zero-sequence voltage injection[J].Automation of Electric Power Systems,2014,38(5):96-102.DOI:10.7500/AEPS201210276.
[21]武文,吴学智,荆龙,等.模块化多电平变流器子模块故障容错控制策略[J].电网技术,2016,40(1):11-18.WU Wen,WU Xuezhi,JING Long,et al.A fault-tolerated control strategy for sub-module faults of modular multilevel converters[J].Power System Technology,2016,40(1):11-18.
[22]廖武,黄守道,黄晟,等.基于模块化多电平换流器的直流输电系统网侧不平衡故障穿越研究[J].电工技术学报,2015,30(12):197-203.LIAO Wu,HUANG Shoudao,HUANG Sheng,et al.Unbalanced grid fault ride-through control method of HVDC power transmission based on modular multilevel converters[J].Transactions of China Electrotechnical Society,2015,30(12):197-203.
[23]MOON J W,KIM C S,PARK J W,et al.Circulating current control in MMC under the unbalanced voltage[J].IEEE Transactions on Power Delivery,2013,28(3):1952-1959.
[24]ZHOU Yuebin,JIANG Daozhuo,GUO Jie,et al.Analysis and control of modular multilevel converters under unbalanced conditions[J].IEEE Transactions on Power Delivery,2013,28(4):1986-1995.
[25]YU Yifan,KONSTANTINOU G,HREDZAK B A.Operation of cascaded H-bridge multilevel converters for large-scale photovoltaic power plants under bridge failures[J].IEEE Transactions on Industrial Electronics,2015,62(11):7228-7236.
[26]HABETLER T G.A space vector-based rectifier regulator for AC/DC/AC converters[J].IEEE Transactions on Power Electronics,1993,8(1):30-36.
[2]贾宏杰,王丹,徐宪东,等.区域综合能源系统若干问题研究[J].电力系统自动化,2015,39(7):198-207.DOI:10.7500/AEPS20141009011.JIA Hongjie,WANG Dan,XU Xiandong,et al.Research on some key problems related to integrated energy systems[J].Automation of Electric Power Systems,2015,39(7):198-207.DOI:10.7500/AEPS20141009011.
[3]徐宪东,贾宏杰,靳小龙,等.区域综合能源系统电/气/热混合潮流算法研究[J].中国电机工程学报,2015,35(14):3634-3642.XU Xiandong,JIA Hongjie,JIN Xiaolong,et al.Study on hybrid heat-gas-power flow algorithm for integrated community energy system[J].Proceedings of the CSEE,2015,35(14):3634-3642.
[4]贾宏杰,穆云飞,余晓丹.对我国综合能源系统发展的思考[J].电力建设,2015,36(1):16-25.JIA Hongjie,MU Yunfei,YU Xiaodan.Thought about the integrated energy system in China[J].Electric Power Construction,2015,36(1):16-25.
[5]陈启超,王建赜,纪延超.基于LLC谐振变换器的电力电子变压器[J].电力系统自动化,2014,38(3):41-46.DOI:10.7500/AEPS201211028.CHEN Qichao,WANG Jianze,JI Yanchao.Power electronic transformer based on LLC resonant converter[J].Automation of Electric Power Systems,2014,38(3):41-46.DOI:10.7500/AEPS201211028.
[6]张祥龙,周晖,肖智宏,等.电力电子变压器在有源配电网无功优化中的应用[J].电力系统保护与控制,2017,45(4):80-85.ZHANG Xianglong,ZHOU Hui,XIAO Zhihong,et al.Power electronic transformer applied to optimization of reactive power in active distribution system[J].Power System Protection and Control,2017,45(4):80-85.
[7]盛万兴,兰征,段青,等.自储能型能量路由器研究[J].电网技术,2017,41(2):387-393.SHENG Wanxing,LAN Zheng,DUAN Qing,et al.Study on self energy storage based energy router[J].Power System Technology,2017,41(2):387-393.
[8]SHE X,HUANG A Q,BURGOS R.Review of solid-state transformer technologies and their application in power distribution systems[J].IEEE Journal of Emerging and Selected Topics in Power Electronics,2013,1(3):186-198.
[9]盛万兴,刘海涛,曾正,等.一种基于虚拟电机控制的电能路由器[J].中国电机工程学报,2015,35(14):3541-3550.SHENG Wanxing,LIU Haitao,ZENG Zheng,et al.An energy hub based on virtual-machine control[J].Proceedings of the CSEE,2015,35(14):3541-3550.
[10]宗升,何湘宁,吴建德,等.基于电力电子变换的电能路由器研究现状与发展[J].中国电机工程学报,2015,35(18):4559-4570.ZONG Sheng,HE Xiangning,WU Jiande,et al.Overview of power electronics based electrical energy router[J].Proceedings of the CSEE,2015,35(18):4559-4570.
[11]ZHAO T F,WANG G Y,BHATTACHARYA S,et al.Voltage and power balance control for a cascaded H-bridge converter-based solid-state transformer[J].IEEE Transactions on Power Electronics,2013,28(4):1523-1532.
[12]SHE X,YU X W,WANG F,et al.Design and demonstration of 3.6-kV-120-V/100-kVA solid-state transformer for smart grid application[J].IEEE Transactions on Power Electronics,2014,29(8):3982-3996.
[13]李响,郝瑞祥,游小杰,等.一种级联电力电子变压器直流电压平衡控制策略[J].电工技术学报,2017,32(2):238-245.LI Xiang,HAO Ruixiang,YOU Xiaojie,et al.A DC voltage balance control strategy for the cascaded power electronic transformer[J].Transactions of China Electrotechnical Society,2017,32(2):238-245.
[14]李子欣,王平,楚遵方,等.面对中高压智能配电网的电力电子变压器研究[J].电网技术,2013,39(9):2592-2601.LI Zixin,WANG Ping,CHU Zunfang,et al.Research on medium-and high-voltage smart distribution grid oriented power electronic transformer[J].Power System Technology,2013,39(9):2592-2601.
[15]刘闯,支月媚.混合级联式电力电子变压器拓扑结构及控制策略[J].电网技术,2017,41(2):596-603.LIU Chuang,ZHI Yuemei.Hybrid cascaded power electronics transformer topology and control scheme[J].Power System Technology,2017,41(2):596-603.
[16]曹阳,袁立强,朱少敏,等.面向能源互联网的配网能量路由器关键参数设计[J].电网技术,2015,39(11):3094-3101.CAO Yang,YUAN Liqiang,ZHU Shaomin,et al.Parameter design of energy router orienting energy internet[J].Power System Technology,2015,39(11):3094-3101.
[17]吴剑,石健将,张至愚.三相模块级联型固态变压器均压/均功率控制策略研究[J].电源学报,2015,13(2):17-26.WU Jian,SHI Jianjiang,ZHANG Zhiyu.Research on voltage and power balance control for three-phase cascaded modular solid-state transformer[J].Journal of Power Supply,2015,13(2):17-26.
[18]王杉杉,王玉斌,林意斐,等.级联型电力电子变压器电压与功率均衡控制方法[J].电工技术学报,2016,31(22):92-99.WANG Shanshan,WANG Yubin,LIN Yifei,et al.Voltage and power balance control for cascaded multilevel converter based power electronic transformer[J].Transactions of China Electrotechnical Society,2016,31(22):92-99.
[19]WANG Xinyu,LIU Jinjun,OUYANG S,et al.Control and experiment of an H-bridge-based three-phase three-stage modular power electronic transformer[J].IEEE Transactions on Power Electronics,2016,31(3):2002-2011.
[20]申科,王建赜,班明飞,等.基于零序电压注入的模块化多电平变流器故障容错控制[J].电力系统自动化,2014,38(5):96-102.DOI:10.7500/AEPS201210276.SHEN Ke,WANG Jianze,BAN Mingfei,et al.Fault-tolerant control for modular multilevel converter based on zero-sequence voltage injection[J].Automation of Electric Power Systems,2014,38(5):96-102.DOI:10.7500/AEPS201210276.
[21]武文,吴学智,荆龙,等.模块化多电平变流器子模块故障容错控制策略[J].电网技术,2016,40(1):11-18.WU Wen,WU Xuezhi,JING Long,et al.A fault-tolerated control strategy for sub-module faults of modular multilevel converters[J].Power System Technology,2016,40(1):11-18.
[22]廖武,黄守道,黄晟,等.基于模块化多电平换流器的直流输电系统网侧不平衡故障穿越研究[J].电工技术学报,2015,30(12):197-203.LIAO Wu,HUANG Shoudao,HUANG Sheng,et al.Unbalanced grid fault ride-through control method of HVDC power transmission based on modular multilevel converters[J].Transactions of China Electrotechnical Society,2015,30(12):197-203.
[23]MOON J W,KIM C S,PARK J W,et al.Circulating current control in MMC under the unbalanced voltage[J].IEEE Transactions on Power Delivery,2013,28(3):1952-1959.
[24]ZHOU Yuebin,JIANG Daozhuo,GUO Jie,et al.Analysis and control of modular multilevel converters under unbalanced conditions[J].IEEE Transactions on Power Delivery,2013,28(4):1986-1995.
[25]YU Yifan,KONSTANTINOU G,HREDZAK B A.Operation of cascaded H-bridge multilevel converters for large-scale photovoltaic power plants under bridge failures[J].IEEE Transactions on Industrial Electronics,2015,62(11):7228-7236.
[26]HABETLER T G.A space vector-based rectifier regulator for AC/DC/AC converters[J].IEEE Transactions on Power Electronics,1993,8(1):30-36.