利用全桥MMC注入特征信号的直流自适应重合闸方法  

Adaptive Auto-Reclosing of DC Line Based on Characteristic Signal Injection With FB-MMC

作　　者：宋国兵[1] 王婷[1] 张晨浩 吴磊[1] Song Guobing;Wang Ting;Zhang Chenhao;Wu Lei(School of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049,Shaanxi Province,China)

机构地区：[1]西安交通大学电气工程学院

出　　处：《电网技术》2019年第1期149-156,共8页Power System Technology

基　　金：国家重点研发计划资助“大型交直流混联电网运行控制与保护研究”(2016YFB0900603);国家电网公司科技项目(52094017000W)~~

摘　　要：交流线路自适应重合闸利用健全相和跳开相之间的耦合关系进行永久性故障性质判别,考虑到直流线路故障清除后,健全极与故障极无耦合关系,并充分利用换流器的高可控性,提出了一种向直流故障线路注入特征信号的故障性质判别方法。首先详细阐述了特征信号的选取原则、特征信号的产生原理与调节;其次通过附加控制策略向直流故障线路注入特征信号,利用该特征信号在故障线路和健全线路的传播特性差异进行故障性质判别,仿真结果验证了文中提出利用全桥换流器注入特征信号判别故障性质方法的有效性。Electrical coupling between transmission lines is the premise of single-/three-phase adaptive reclosing.Considering the relationship between DC transmission lines in steady state,this paper presents a method injecting characteristic signal to a faulty DC line to identify fault property,making full use of the control characteristics of full bridge based converter without circuit breaker.The problem of non-selective restart of current HVDC transmission is solved.In this paper,the selection principle of characteristic signals,and the principle and regulation of the characteristic signal are analyzed in detail.Then,a characteristic signal is injected into the DC faulty line according to additional control strategy and the fault property is discriminated based on the propagation characteristics of the faulty line and the healthy line.Simulation results verify validity of the method distinguishing the fault properties by injecting characteristic signal using full bridge based converter.

关 键 词：全桥MMC 主动注入 故障性质判别 直流线路故障 

分 类 号：TM712[电气工程—电力系统及自动化]