电力电子化背景下交流电网保护配置方案  

Research on AC Protection Scheme Under the Background of Power Electronics

作　　者：申洪明 肖智宏 刘颖 高旭 王紫琪 李铁臣 杜娜 SHEN Hongming;XIAO Zhihong;LIU Ying;GAO Xu;WANG Ziqi;LI Tiechen;DU Na(State Grid Economic and Technological Research Institute Co.,Ltd.,Beijing 102209,China;State Grid Jibei Electric Power Company Limited,Beijing 100053,China)

机构地区：[1]国网经济技术研究院有限公司,北京市102209 [2]国网冀北电力有限公司,北京市100053

出　　处：《电力建设》2020年第7期75-81,共7页Electric Power Construction

基　　金：国家电网公司科技项目“面向柔性直流接入的交流侧新型保护控制设计技术研究”(B3441518K002)。

摘　　要：大量电力电子器件的应用使得交流系统的故障特性发生了较大变化,现有保护配置方案面临严峻挑战。首先分析了纯交流系统、直流输电系统、新能源并网等不同场景下交流线路故障暂态电流波形特征,进而利用相关系数进行暂态电流波形辨识,构建了新型保护原理与配置方案。最后,分析了新型保护方案对互感器、采样频率、数据窗长的配置要求。新型保护配置方案普适性强,出口速度快,实现简单。基于EMTDC/PSCAD仿真与样机测试结果验证了分析结论的正确性。The application of a lot of power electronic equipment has caused a large change in the fault characteristics of the AC system,and the existing protection schemes faces greater challenge.This paper firstly analyzes the waveform characteristics of AC line fault current in different fault scenarios,such as pure AC systems,DC transmission systems and new energy grid-connection,and then a new protection scheme based on identification of transient current spectrum is proposed.At last,the effect of current transformer,sampling frequency and data window length is analyzed.The new protection scheme has many application scenarios,fast operation,and simple implementation.The conclusions are verified by the simulation results of EMTDC/PSCAD and prototype test.

关 键 词：电力电子化 相关系数 保护配置方案 性能测试 

分 类 号：TM774[电气工程—电力系统及自动化]