连接交流系统的HVDC线路暂态稳定判别及保护机制  

Transient stability criterion and protection mechanism of HVDC link connected to AC systems

作　　者：高博 汪玉 张同谦[2] 陈冬[2] 丁津津 李远松 张峰 Gao Bo;Wang Yu;Zhang Tongqian;Chen Dong;Ding Jinjin;Li Yuansong;Zhang Feng(Electric Power Research Institute of State Grid Anhui Electric Power Company Limited,Hefei 230601,China;Anhui Huadian Engineering Consultating&Design Co.,Ltd.,Hefei 230022,China)

机构地区：[1]国网安徽省电力有限公司电力科学研究院,合肥230601 [2]安徽华电工程咨询设计有限公司,合肥230022

出　　处：《电测与仪表》2020年第16期130-133,140,共5页Electrical Measurement & Instrumentation

基　　金：国家电网有限公司科技项目(SGAH0000TKJS1900055)。

摘　　要：随着交/直流混联系统不断推广应用,混联系统的保护动作机制决定着系统的稳定性。提出了一种交直流混联系统稳定性判别原则,根据直流系统故障后的恢复运行极限时间配置保护。分析了交直流混联系统的暂态稳定性模型,推导出了HVDC连接下的电磁功率表达式。以两机交直流混联系统为例,分析了暂态稳定的AC/DC等面积定则,给出了故障前、故障中和故障后的分析。根据两机系统暂态稳定判据,提出了直流系统故障下的恢复运行的极限时间,以此配置保护,提高混联系统的暂态稳定性。通过仿真算例,分析了影响AC/DC系统暂态稳定性的主要参数,同时说明了所提方法的适用性。With the continuous promotion and application of the AC/DC hybrid system,the protection operation mechanism of the hybrid system determines the stability of the system.This paper proposes a transient stability criterion for AC/DC hybrid systems,which is configured according to the critical time to return to operation in case of DC contingencies.Firstly,the transient stability model of AC/DC hybrid system is analyzed,and the electromagnetic power expression with HVDC link is derived.Secondly,taking the two-machine AC-DC hybrid system as an example,the equal area criterion of transient stability AC/DC is proposed,and the analysis of pre-,during and post fault is given.According to the transient stability criterion of the two-machine system,the critical time to return to operation under the DC system fault is proposed,and the protection is configured to improve the transient stability of the hybrid system.Finally,the main parameters affecting the transient stability of AC/DC system are analyzed by simulation examples.The applicability of the proposed method is also illustrated.

关 键 词：交直流混联系统 暂态稳定性 等面积定则 直流特高压 

分 类 号：TM933[电气工程—电力电子与电力传动]