多馈入直流输电系统线路后备保护定值优化仿真研究  

Simulation Study on Setting Optimization of Line Backup Protection for Multi-infeed DC Transmission System

作　　者：李宽 李娜 赵斌超 李聪聪 李玉敦 LI Kuan;LI Na;ZHAO Binchao;LI Congcong;LI Yudun(State Grid Shandong Electric Power Research Institute,Jinan 250003,China)

机构地区：[1]国网山东省电力公司电力科学研究院,山东济南250003

出　　处：《山东电力技术》2021年第1期10-14,共5页Shandong Electric Power

基　　金：国家电网有限公司科技项目“核心元器件对继电保护装置性能影响评估及测试研究”(2100-201955023A-0-0-00);国网山东省电力公司科技项目“特高压交直流混联受端电网安全风险预警和控制决策技术研究”(520626190057)。

摘　　要：山东电网是典型的特高压交直流混联大电网,同时也是典型的多馈入直流输电系统,为了应对此复杂工况,提出以通过优化后备保护定值的方式来防止主保护拒动时造成多条直流连续换相失败,进而避免引发多直流闭锁从而导致电网崩溃。针对距离后备保护段配合原则与零序后备保护段配合原则开展仿真分析,仿真结果表明,直流落点的接入并不会给交流继电保护后备段的配合带来新的问题,距离后备段采用简化整定原则后,当某一线路主保护全部失去时,该线路故障可能造成上一级线路距离Ⅱ段和本级线路距离Ⅱ段同时满足动作条件,由于延时一样,可能出现配合问题,需对此类情况的配合进行校核。Shandong power grid is a typical UHV AC/DC hybrid power grid and a typical multi infeed DC transmission system.In order to cope with the complex working conditions,a method to deal with the main protection failure by optimizing the setting value of backup protection was proposed by this paper,so as to prevent the multi DC blocking caused by the continuous commutation failure of multiple HVDC,which may lead to the grid collapse.The co-operative principle of distance backup protection section and zero sequence backup protection section were simulated and analyzed.The simulation results show that HVDC does not bring new problems to the coordination of backup section of AC relay protection.After the simplified setting principle is adopted for the distance backup section,when the main protection of a line is lost,the fault of the line may cause the operation conditions to be satisfied at the same time for the distance sectionⅡof the upper line and the distance section II of the same level line.Due to the same time delay,there may be coordination problems,so the coordination in such condition should to be checked.

关 键 词：多馈入直流系统 继电保护 距离后备保护 零序后备保护 

分 类 号：TM732[电气工程—电力系统及自动化]