含光伏电源配电网的自适应距离保护  

Photovoltaic power distribution network in adaptive distance protection

作　　者：冯爱成[1] 王宝华[1] 单馨 FENG Aicheng;WANG Baohua;SHAN Xin(Nanjing University of Science and Technology,Nanjing 210094,China;State Grid Electric Power Research Institute,Nanjing 210003,China)

机构地区：[1]南京理工大学,江苏南京210094 [2]国网电力科学研究院,江苏南京210003

出　　处：《电力系统保护与控制》2018年第16期141-147,共7页Power System Protection and Control

摘　　要：含光伏电源(PV)的配电网,因光伏电源的短路电流特性造成距离保护分支系数的不确定性,进而导致保护的拒动或误动。针对该问题,根据故障时的复序网络提出基于保护安装处的正序和负序电流的自适应分支系数计算,并以此为基础确立了距离保护Ⅱ段阻抗整定值。以某地区配电网为例通过PSCAD/EMTDC加以仿真,证明了在单相接地故障及相间短路故障情况下该整定方法的准确性与方便性。The fault current characteristics of photovoltaic in distribution network causes uncertainty of distance protection branch coefficient,resulting in protection devices refusing to operate or mal-operating.In order to solve this problem,this paper puts forward to proceed with adaptive branch coefficient calculation according to the positive and negative sequence current of the protection.Then,zone II setting of distance protection can be identified.Finally,one distribution network is simulated using the PSCAD/EMTDC.The single-phase grounding fault and two-phase short circuit results of simulation show the validity and convenience of the method.

关 键 词：光伏电源 配电网 复合序网 分支系数 距离保护 

分 类 号：TM615[电气工程—电力系统及自动化]