基于序电流故障分量的含DER点状网络逆功率保护新方法  

Improved Reverse Power Protective Relaying for Spot Network With DER Based on Sequence Current Components

作　　者：仉志华[1] 冯兴田[1] 殷铭泽 徐丙垠[3] 

机构地区：[1]中国石油大学(华东)信息与控制工程学院,山东省青岛市266580 [2]国家电网日照供电公司,山东省日照市276826 [3]山东理工大学电气与电子工程学院,山东省淄博市255049

出　　处：《电网技术》2016年第11期3566-3573,共8页Power System Technology

基　　金：国家自然科学基金项目(51177096);国家863高技术基金项目(2012AA050213)~~

摘　　要：点状网络具有较高的供电可靠性,且有利于分布式电源(distributed energy resource,DER)接入;但DER宽限接入后会引起中压馈线频繁出现功率倒送,现有的点状网络逆功率保护无法适应,限制了DER接入容量。根据DER出力波动性与点状网络故障引起的电流变化特征,提出了基于序电流故障分量及其功率方向的逆功率保护新方法。分析了点状网络中不同位置发生各种短路故障时的序分量特征,利用序电流突变量作为启动元件判断系统运行状态,通过序功率方向确定故障位置,在保证保护动作性能的基础上突破对DER接入容量限制;给出了序电流突变量启动定值以及各序功率方向的动作区间。建模仿真结果证明,该保护方法能够实现高供电可靠性与DER友好接入的有机统一。Spot network has high power supply reliability, beneficial to distributed energy resource（DER） integration. However, there will be reverse power in MV feeders if amounts of DER are injected into spot network. Existing reverse power protection cannot be used in this situation and this is a limitation for DER integration. According to difference between DER outputs and faults in spot network, a new reverse power protection is proposed. It is based on current sequence component and its power direction. Electric parameter characteristics are analyzed for various short-circuit faults occurring in different locations. Status difference between fault and normal operations with reverse power can be determined with positive and negative sequence current variation, and fault location can be determined with sequence power direction. This method performs well under fault condition and can overcome limitation for DER integration. Value setting rule and action zone of power is discussed. Simulation results confirm that high supply reliability and high penetration of DER can be achieved simultaneously with the proposed method in this paper.

关 键 词：点状网络 分布式电源 逆功率保护 序电流故障分量 功率方向 

分 类 号：TM72[电气工程—电力系统及自动化]