基于故障波头的多端差动保护向量对时修正算法
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摘要
分布式电源在配网中的大量接入,对配网本身继电保护系统的动作性能提出了新的要求。现有基于SDH通信对时的多端差动保护整定为了保障动作的可靠性,必然会牺牲一定的灵敏性,已不能适应未来有源配电网的发展需求。本文提出了一种基于故障波头到达时刻的多端差动保护向量对时修正算法,能够在电气距离规模较小的配网中修正对时失准的差动电流信号,在不牺牲灵敏性的前提下,大大提升了保护的可靠性。最后通过算例对该算法的性能进行了分析和校验,验证了其优越性。
A large number of access to distributed power supply in distribution network has put forward new requirements on the performance of relay protection system of distribution network itself. The existing multi-terminal differential protection based on SDH communication is set as the reliability of the safeguard action, which will inevitably sacrifice a certain sensitivity, so it cannot meet the development demand of the future active distribution network. In this paper,a time-correcting algorithm based on multi-terminal differential protection vector is presented, and it can correct the misalignment of the differential current signal in the distribution network with small electrical distance, which greatly improves the reliability of the protection without sacrificing the sensitivity. The performance of the algorithm is analyzed and validated by an example.
A large number of access to distributed power supply in distribution network has put forward new requirements on the performance of relay protection system of distribution network itself. The existing multi-terminal differential protection based on SDH communication is set as the reliability of the safeguard action, which will inevitably sacrifice a certain sensitivity, so it cannot meet the development demand of the future active distribution network. In this paper,a time-correcting algorithm based on multi-terminal differential protection vector is presented, and it can correct the misalignment of the differential current signal in the distribution network with small electrical distance, which greatly improves the reliability of the protection without sacrificing the sensitivity. The performance of the algorithm is analyzed and validated by an example.
引文
[1]罗婉琴.一起主变差动保护误动案例的分析与对策[J].电气技术, 2014, 15(9):112-115.
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[8]张怿宁,索南加乐,焦在滨.光纤自愈环网电流纵差保护的数据同步方法[J].电力系统自动化,2006(9):44-49.
[9]王尔寒,王强,文明浩,等.光纤纵差保护中数据同步的误差分析及补偿办法[J].继电器,2003,31(8):43-45.
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[11]梁睿,靳征,王崇林,等.行波时频复合分析的配电网故障定位研究[J].中国电机工程学报,2013,33(28):130-136.
[12]徐伟宗,唐昆明.基于导数法的故障行波波头识别改进算法[J].电网技术, 2010, 34(1):198-202.
[13]覃剑.输电线路单端行波故障测距的研究[J].电网技术, 2005, 29(15):65-70.
[2]刘慧斌,苗茂.电流互感器两点接地引起的线路纵差保护动作分析[J].电气技术, 2018, 19(1):114-116.
[3]高厚磊,江世芳,贺家李.数字电流差动保护中几种采样同步方法[J].电力系统自动化,1996,20(9):46-49, 53.
[4]李永丽,李仲青,李斌,等.超、特高压长线路光纤纵差保护数据同步[J].天津大学学报,2007,40(2):168-172.
[5]曹团结,陈建玉,黄国方.基于IEC 61850?9的光纤差动保护数据同步方法[J].电力系统自动化,2009,33(24):58-60, 103.
[6]曹团结,徐建松,尹项根,等.光纤差动保护插值法数据同步的实现[J].继电器, 2007(S1):134-137.
[7]曹团结,尹项根,张哲,等.通过插值实现光纤差动保护数据同步的研究[J].继电器,2006,34(18):4-8,26.
[8]张怿宁,索南加乐,焦在滨.光纤自愈环网电流纵差保护的数据同步方法[J].电力系统自动化,2006(9):44-49.
[9]王尔寒,王强,文明浩,等.光纤纵差保护中数据同步的误差分析及补偿办法[J].继电器,2003,31(8):43-45.
[10]陈慧.SDH自愈环保护机制及比较[J].中国数据通讯网络, 2000(7):18-22.
[11]梁睿,靳征,王崇林,等.行波时频复合分析的配电网故障定位研究[J].中国电机工程学报,2013,33(28):130-136.
[12]徐伟宗,唐昆明.基于导数法的故障行波波头识别改进算法[J].电网技术, 2010, 34(1):198-202.
[13]覃剑.输电线路单端行波故障测距的研究[J].电网技术, 2005, 29(15):65-70.