适用于微电网的变频式继电保护方案
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摘要
为解决微电网故障定位问题,本文通过分析其故障特性和逆变器电源故障后输出要求,提出采用新故障特征的变频式继电保护方案,设计可输出变频故障电流的逆变器电源和变频式过电流继电保护装置。在逆变器电源侧将等效于旋转发电机的短路电流转换为幅值固定而频率变化的短路输出电流。保护装置则可以将幅值固定但频率变化的实测电流转换为频率为50Hz但幅值可以很高的虚拟短路电流,同时获得虚拟短路电压,可用于过电流保护和低电压保护等。最后通过Matlab和RTDS仿真实验验证了微电网保护通过变频方式解决的可行性。
In order to solve the problem of micro-grid fault location, the variable frequency based relay protection is established by analyzes the fault characteristics and output requirements of inverter power failure. The inverter source, which can output variable frequency current and the improved relay device, are designed. The amplitude of virtual current, which is the same as generated by rotating electric machine, is modulated into frequency. Meanwhile, the relay device can demodulate the variable frequency current into equivalent current again. Then the virtual current of 50 Hz and high amplitude can be used in traditional protection method. Finally, the effectiveness of the scheme is verified by Matlab and RTDS simulation experiments.
In order to solve the problem of micro-grid fault location, the variable frequency based relay protection is established by analyzes the fault characteristics and output requirements of inverter power failure. The inverter source, which can output variable frequency current and the improved relay device, are designed. The amplitude of virtual current, which is the same as generated by rotating electric machine, is modulated into frequency. Meanwhile, the relay device can demodulate the variable frequency current into equivalent current again. Then the virtual current of 50 Hz and high amplitude can be used in traditional protection method. Finally, the effectiveness of the scheme is verified by Matlab and RTDS simulation experiments.
引文
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[12]蔡冰倩,贾利虎,朱永强,等.直流微电网电压等级序列选择的影响因素研究[J].电工电能新技术,2016,35(12):45-51.Cai Bingqian,Jia Lihu,Zhu Yongqiang,et al.Research on influence factor of voltage class series option in DC micro-grid[J].Advanced Technology of Electrical Engineering&Energy,2016,35(12):45-51.
[13]赵卓立,杨苹,郑成立,等.微电网动态稳定性研究述评[J].电工技术学报,2017,32(10):111-122.Zhao Zhuoli,Yang Ping,Zheng Chengli,et al.Review on dynamic stability research of microgrid[J].Transactions of China Electrotechnical Society,2017,32(10):111-122.
[14]张羽,李咸善.基于频率调整策略的微电网多目标优化自愈控制[J].电网技术,2017,41(3):831-839.Zhang Yu,Li Xianshan.Multi-objective optimization for micro-grid self-healing control based on frequency regulation strategy[J].Power System Technology,2017,41(3):831-839.
[15]陈丽娟,王致杰.基于改进下垂控制的微电网运行控制研究[J].电力系统保护与控制,2016,44(4):16-21.Chen Lijuan,Wang Zhijie.Research of operation control of micro-grid based on improved droop control[J].Power System Protection&Control,2016,44(4):16-21.
[2]Al-Nasseri H,Li F.A voltage based protection for micro-grids containing power electronic converters[C]//IEEE Power Engineering Society General Meeting,Quebec,Canada,2006.
[3]Al-Nasseri H,Redfern M A.Harmonics content based protection scheme for micro-grids dominated by solid state converters[C]//Power System Conference,IEEE,Aswan,Egypt,2008:50-56.
[4]周涵,牟龙华,郭文明.基于故障分量的孤岛微电网保护[J].电工技术学报,2017,32(17):11-20.Zhou Han,Mu Longhua,Guo Wenming.Islanded microgrid protection based on fault components[J].Transactions of China Electrotechnical Society,2017,32(17):11-20.
[5]李永丽,金强,李博通,等.低电压加速反时限过电流保护在微电网中的应用[J].天津大学学报,2011,44(11):955-960.Li Yongli,Jin Qiang,Li Botong,et al.Application of inverse-time overcurrent protection based on low voltage acceleration in micro-grid[J].Journal of Tianjin University,2011,44(11):955-960.
[6]吴恒.适用于微电网的变频式继电保护研究[D].南京:河海大学,2014.
[7]李娟,高厚磊,朱国防.考虑逆变类分布式电源特性的有源配电网反时限电流差动保护[J].电工技术学报,2016,31(17):74-83.Li Juan,Gao Houlei,Zhu Guofang.Inverse-time current differential protection in active distribution network considering characteristics of inverterinterfaced distributed generations[J].Transactions of China Electrotechnical Society,2016,31(17):74-83.
[8]肖湘宁,王鹏,陈萌.基于分布式多代理系统的孤岛微电网二次电压控制策略[J].电工技术学报,2018,33(8):1894-1902.Xiao Xiangning,Wang Peng,Chen Meng.Secondary voltage control in an islanded micro-grid based on distributed multi-agent system[J].Transactions of China Electrotechnical Society,2018,33(8):1894-1902.
[9]石荣亮,张兴,徐海珍,等.光储柴独立微电网中的虚拟同步发电机控制策略[J].电工技术学报,2017,32(23):127-139.Shi Rongliang,Zhang Xing,Xu Haizheng,et al.Acontrol strategy for islanded photovoltaic-batterydiesel micro-grid based on virtual synchronous generator[J].Transactions of China Electrotechnical Society,2017,32(23):127-139.
[10]陶以彬,李官军,柯勇,等.微电网并/离网故障特性和继电保护的配置研究[J].电力系统保护与控制,2015,43(11):95-100.Tao Yibin,Li Guanjun,Ke Yong,et al.Research on the fault characteristics and relay configuration of micro-grid in the grid and off-grid mode[J].Power System Protection&Control,2015,43(11):95-100.
[11]杨增力,孔祥平,王力军,等.适用于双馈风电场联络线的距离保护方案[J].电工技术学报,2016,31(24):252-260.Yang Zengli,Kong Xiangping,Wang Lijun,et al.Distance protection scheme for interconnection line of doubly-fed induction generator based wind farm[J]Transactions of China Electrotechnical Society,2016,31(24):252-260.
[12]蔡冰倩,贾利虎,朱永强,等.直流微电网电压等级序列选择的影响因素研究[J].电工电能新技术,2016,35(12):45-51.Cai Bingqian,Jia Lihu,Zhu Yongqiang,et al.Research on influence factor of voltage class series option in DC micro-grid[J].Advanced Technology of Electrical Engineering&Energy,2016,35(12):45-51.
[13]赵卓立,杨苹,郑成立,等.微电网动态稳定性研究述评[J].电工技术学报,2017,32(10):111-122.Zhao Zhuoli,Yang Ping,Zheng Chengli,et al.Review on dynamic stability research of microgrid[J].Transactions of China Electrotechnical Society,2017,32(10):111-122.
[14]张羽,李咸善.基于频率调整策略的微电网多目标优化自愈控制[J].电网技术,2017,41(3):831-839.Zhang Yu,Li Xianshan.Multi-objective optimization for micro-grid self-healing control based on frequency regulation strategy[J].Power System Technology,2017,41(3):831-839.
[15]陈丽娟,王致杰.基于改进下垂控制的微电网运行控制研究[J].电力系统保护与控制,2016,44(4):16-21.Chen Lijuan,Wang Zhijie.Research of operation control of micro-grid based on improved droop control[J].Power System Protection&Control,2016,44(4):16-21.