换相失败后直流整流站有功特性及其对送端交流系统影响的研究  

Study on Post-commutation-failure Active Power Characteristics of HVDC Converter and Its Influence on Sending-end AC System

作　　者：吴启亮 卢子敬 王杰 徐秋实 欧阳稳 张焱哲 莫石 耿仁东 WU Qiliang;LU Zijing;WANG Jie;XU Qiushi;OUYANG Wen;ZHANG Yanzhe;MO Shi;GENG Rendong(State Grid Hubei Electric Power Company Limited Economic Research Institute,Wuhan 430077,China;State Grid Hubei Electric Power Co.,Ltd.,Wuhan 430077,China;Central Southern China Electric Power Design Institute of CPECC,Wuhan 430071,China)

机构地区：[1]国网湖北省电力有限公司经济技术研究院,湖北武汉430077 [2]国网湖北省电力有限公司,湖北武汉430077 [3]中国电力工程顾问集团中南电力设计院有限公司,湖北武汉430071

出　　处：《电工技术》2024年第19期80-84,87,共6页Electric Engineering

摘　　要：针对直流换相失败的研究目前主要集中在逆变站及受端电网,而直流换相失败引起的整流站有功功率变化可能超过直流输电功率,会对送端交流系统造成巨大的功率冲击。首先,介绍了直流换流器的等效数学模型以及目前工程中常用的整流站控制策略。接着,基于包含详细控保系统的实际直流工程电磁暂态仿真模型,结合相关电气量的变化轨迹分析了直流换相失败后整流站注入交流系统的有功功率变化超过正常输送功率的机理,并分析了故障严重程度、功率控制方式、控制器参数等因素对整流侧有功功率冲击大小的影响。最后,针对实际交直流混联电网,分析了受端电网故障引发直流换相失败后,其对送端电网产生的功率冲击对系统稳定性的影响。研究结论可以为实际电网运行提供参考。Currently published studies on DC commutation failure have mainly focused on the inverter station and the receiving-end AC system.This study discovered that the active power change of DC rectifier station caused by commutation failure might exceed the transmission power,thus causing huge power impact on the sending-end AC system.The work first clarified the equivalent model of LCC converter and the common DC control strategy in the current project.Then it established an electromagnetic transient simulation model of actual UHVDC project with detailed control and protection system explored the variation law of relevant electric parameters,and consequently analyzed the mechanism of post-commutation-failure active power variation exceeding normal transmission power,and the impacts of factors such as fault severity,power control mode,controller parameters,etc.,on rectifier-side active power.Finally it simulated the influence of receiving-end-fault-induced post-DC-commutation-failure strong active power fluctuation on stability of sending-end system with respect to practical AC/DC hybrid network.The conclusion of this study may contain useful information for operation and control of actual power system.

关 键 词：直流换相失败 整流站 有功功率特性 电流调节器 送端系统稳定性 

分 类 号：TM721.1[电气工程—电力系统及自动化]