利用健全极MMC注入特征信号的直流线路故障性质判别方法  

DC Line Fault Identification Based on Characteristic Signal Injection Using the MMC of Sound Pole

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 China)

机构地区：[1]西安交通大学电气工程学院,西安710049

出　　处：《电工技术学报》2019年第5期994-1003,共10页Transactions of China Electrotechnical Society

基　　金：国家重点研发计划(2016YFB0900603);国家电网公司科技项目(52094017000W)资助

摘　　要：交流线路自适应重合闸利用跳开相和健全相之间的耦合关系判别线路故障性质;而直流线路故障清除后,直流系统电气量保持恒定,健全极与故障极无耦合关系。在利用高压直流线路极间耦合特性和换流器高可控性的基础上,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。首先详细阐述了高压直流输电线路极间耦合特性,特征信号的产生原理与特征信号的选取原则;其次通过换流站附加控制策略向健全极直流线路注入特征信号,故障线路将耦合感应出对应的特征信号,利用该特征信号在线路故障存在和消失两种状态的传播特性差异进行故障性质判别,仿真结果验证了该方法的有效性。Adaptive auto-reclosing in AC system discriminates fault properties using the coupling relationship between the faulty phase and sound phase. After the DC line fault is cleared, the electrical quantities of the DC system keep constant, and there is no coupling between the sound and faulty pole. On the basis of the coupling of the high voltage dc (HVDC) transmission lines and the high controllability of the converters, a fault property discrimination method is present by injecting characteristic signals into a DC faulty line. The electrode coupling characteristics of HVDC transmission lines, the principle of characteristic signal generation and the selection are first analyzed in detail. Then the characteristic signals are injected into the sound pole through the additional control strategy of the converter station. The faulty line couples the corresponding characteristic signal. This characteristic signal is used to identify the fault properties by the differences of the propagation characteristic between the two states, the fault existence and disappearance states. The simulation results verify the effectiveness of the proposed method in this paper.

关 键 词：线路耦合特性 主动注入 故障性质判别 直流线路故障 

分 类 号：TM77[电气工程—电力系统及自动化]