异步分区后柔直控制方式对深圳电网第三道防线的影响研究  

Research on Influence of Flexible DC Control Method on the Third Line of Defense of Shenzhen Power Grid After Asynchronous Partition

作　　者：龚晨 马伟哲 史军 祝宇翔 卢艺 GONG Chen;MA Weizhe;SHI Jun;ZHU Yuxiang;LU Yi(Shenzhen Power Supply Bureau Co.,Ltd.,Shenzhen 518001,China)

机构地区：[1]深圳供电局有限公司

出　　处：《电工技术》2020年第3期37-39,41,共4页Electric Engineering

基　　金：深圳供电局有限公司规划专题项目“广东电网采用柔性直流异步分区对深圳电网的安全稳定影响研究”（编号2018规专0018）

摘　　要：为应对电网结构日趋复杂背景下短路电流超标问题,广东电网考虑采用背靠背柔性直流(Voltage Source Converter based High Voltage Direct Current,VSC-HVDC)实现东西部异步联网方案。为充分保证异步联网后电力系统运行调控的安全性与可靠性,研究柔直控制方式对系统严重故障稳定性及第三道防线的影响。首先研究了柔直换流器的工作原理,然后分析了VSC-HVDC系统在机电暂态BPA中的控制方式,最后以深圳电网为仿真算例进行实证分析,对比分析得到不同柔直控制方式对电网稳定性的影响。In order to cope with the problem of short-circuit current exceeding the standard under the background of increasingly complex grid structure,Guangdong Power Grid considered adopts the back-to-back flexible DC(VSC-HVDC)asynchronous networking.In order to fully ensure the safety and reliability of power system operation and control after asynchronous networking,the influence of the flexible DC control methods on the system′s serious fault stability and the third line of defense is studied.Firstly,the working principle of the flexible DC converter is studied.Then the control methods of the VSC-HVDC system in the electromechanical transient BPA are analyzed.Finally,the paper is consider about empirical analysis with the Shenzhen Power Grid as a simulation example.The influence of different flexible DC control methods on grid stability is obtained through contrast analysis.

关 键 词：异步联网 柔直 控制策略 直流闭锁 第三道防线 

分 类 号：TM743[电气工程—电力系统及自动化]