含分布式电源的配电网继电保护改进方案
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摘要
在分析分布式电源对传统继电保护整定与配合关系影响的基础上,提出了一种纵联电流相位差动保护的方案,并利用正序电压与正序电流的相位作为辅助判据。该方案只需反映短路时线路两侧电流相位,与短路电流的幅值无关,不受系统振荡、过渡电阻的影响,并且方案简单,工作可靠。最后通过电力系统仿真软件PSCAD/EMTDC对一个含分布式电源的10k V配电网络进行仿真实验,并与传统的电流纵差保护进行对比,验证了所提保护方案的灵敏性、速动性和有效性。
Basing on analyzing the distributed power's effect on the setting of traditional protective relaying and coordination,a scheme of longitudinal current phase differential protection was proposed,which has phase of the positive sequence voltage and the positive sequence current employed as the auxiliary criterion.The scheme,independent of the magnitude of the short circuit,reacts only to the current phase at the short circuit's both sides and is not affected by the oscillation of the power system and a large transition resistance together with simple structure and reliable operation.Making use of PSCAD/EMTDC software to simulate a10 k V distribution network with distributed power supply and comparing it with the traditional current differential protection prove the sensitivity,fastness and efficiency of this proposed protection scheme.
Basing on analyzing the distributed power's effect on the setting of traditional protective relaying and coordination,a scheme of longitudinal current phase differential protection was proposed,which has phase of the positive sequence voltage and the positive sequence current employed as the auxiliary criterion.The scheme,independent of the magnitude of the short circuit,reacts only to the current phase at the short circuit's both sides and is not affected by the oscillation of the power system and a large transition resistance together with simple structure and reliable operation.Making use of PSCAD/EMTDC software to simulate a10 k V distribution network with distributed power supply and comparing it with the traditional current differential protection prove the sensitivity,fastness and efficiency of this proposed protection scheme.
引文
[1]杨义,周羽生.含分布式电源的配电网继电保护配置改进[J].电力建设,2012,33(4):20~23.
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[7]徐海洋,黄兴华,王婷,等.同塔双回线零序电压补偿分析[J].电力系统保护与控制,2017,45(4):86~92.
[8]刘幸蔚,李永丽,陈晓龙,等.逆变型分布式电源T接线路后纵联差动保护的改进方案[J].电网技术,2016,40(4):1257~1264.
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[10]曹哲,刘波,袁智强.高密度分布式光伏发电系统接入配电网准入容量研究[J].电网与清洁能源,2014,(11):118~122.
[11]吴争荣,王钢,李海锋,等.含分布式电源配电网的相间短路故障分析[J].中国电机工程学报,2013,33(1):130~136.
[12]彭春华,张艳伟.基于电流正序分量相位比较的主动配电网保护方案[J].电力自动化设备,2016,36(6):163~169.
[2]吴争荣.含分布式电源配电网的故障分析与保护新原理[D].广州:华南理工大学,2012.
[3]张勇.分布式发电对电网继电保护的影响综述[J].电力系统及其自动化学报,2010,22(2):145~151.
[4]Zhan H,Wang C,Wang Y,et al.Relay Protection Coordination Integrated Optimal Placement and Sizing of Distributed Generation Sources in Distribution Networks[C].Power and Energy Society General Meeting.Piscataway,NJ:IEEE,2016.
[5]张保会,尹项根.电力系统继电保护[M].北京:中国电力出版社,2010.
[6]刘书占.六相输电线路的纵联相差保护研究[D].天津:天津大学,2009.
[7]徐海洋,黄兴华,王婷,等.同塔双回线零序电压补偿分析[J].电力系统保护与控制,2017,45(4):86~92.
[8]刘幸蔚,李永丽,陈晓龙,等.逆变型分布式电源T接线路后纵联差动保护的改进方案[J].电网技术,2016,40(4):1257~1264.
[9]张明锐,林承鑫,王少波,等.一种并网型风光互补发电系统的建模与仿真[J].电网与清洁能源,2014,30(1):68~74.
[10]曹哲,刘波,袁智强.高密度分布式光伏发电系统接入配电网准入容量研究[J].电网与清洁能源,2014,(11):118~122.
[11]吴争荣,王钢,李海锋,等.含分布式电源配电网的相间短路故障分析[J].中国电机工程学报,2013,33(1):130~136.
[12]彭春华,张艳伟.基于电流正序分量相位比较的主动配电网保护方案[J].电力自动化设备,2016,36(6):163~169.