交直流系统受端故障对送端电压扰动影响及对策研究  

Analysis on the Influence of Commutation Failure on Voltage Disturbance in AC and DC System and Countermeasures

作　　者：申洪明 宋璇坤 肖智宏 刘颖 陈炜 张祥龙 曹靖[2] SHEN Hongming;SONG Xuankun;XIAO Zhihong;LIU Ying;CHEN Wei;ZHANG Xianglong;CAO Jing(State Grid Economic and Technologicl Research Institute Co.,Ltd.,Beijing 102209,China;College of Electrical Engineering,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]国网经济技术研究院有限公司,北京102209 [2]浙江大学电气工程学院,杭州310027

出　　处：《电力电容器与无功补偿》2018年第5期81-86,共6页Power Capacitor & Reactive Power Compensation

摘　　要：交直流系统受端与送端通过直流控制相互耦合。文章详细分析了换相失败及直流闭锁对送端交流母线电压的影响,揭示了换相失败与直流闭锁导致送端过电压的机理,分析结果表明送端交流系统功率因数降低以及无功补偿装置不能实时适应电网的运行是造成过电压的主要原因,并进一步提出了解决送端过电压可能造成大规模风电脱网的措施,最后基于PSCAD/EMTDC仿真验证了结论的正确性。The sending and receiving end of AC and DC system are coupled each other through DC control.In this paper,the influence of commutation failure and DC block on the sending end voltage is analyzed in detail.The mechanism of the sending end over voltage due to communication failure and DC block is revealed.It is shown by the analysis result that the main reason of over voltage is due to the reduction of power factor of AC system at the sending end and no real time adaption of the reactive power device to the operation of grid.The measures on solving such problem as large scale wind power offline due to the sending overvoltage is proposed further and,finally,the correctness of the conclusion is verified by PSACD/EMTDC simulation.

关 键 词：高压直流输电 换相失败 直流送端 电压稳定 风机脱网 

分 类 号：TM721.1[电气工程—电力系统及自动化]