摘要
多馈入直流输电系统(MIDC)可以实现大容量的功率传输,运行方式也更加灵活,但同时也增加了系统的复杂程度,带来的问题也不少。换相失败是常见的故障,会造成系统直流电流增大、换流母线过电压,除了会在本回路造成多次后续的换相失败外,更严重时还会影响到其他回路,使多条回路同时发生换相失败,引发直流闭锁。因此,换相失败后的恢复问题普遍受到人们关注,如何把换相失败的时间及范围控制到最小关系着整个多馈入系统能否稳定运行。文章提出了静止无功补偿器Statcom接入系统等效加强了交流系统的强度,扩大了系统的稳定运行区域,从而可以达到改善换相失败后的恢复过程的目的。
Multi-infeed HVDC system can realize large-capacity power transmission and flexible operation,but it also increases the complexity of the system and brings more problems.As a common fault,commutation failure can cause the increase of DC current and overvoltage of converter busbar.It will cause both local commutation failure and concurrent commutation failure,and even cause DC block.Therefore,the recovery problem has been generally concerned.How to minimize the time and range of commutation failure is related to the stable operation of the entire system.This paper proposes that Statcom can add strength of AC system and expand the stable operating area so as to improve the recovery process after the commutation failure.
作者
李旭旻
顾丹珍
杨秀
赵丹丹
崔勇
张苏捷
Li Xumin;Gu Danzhen;Yang Xiu;Zhao Dandan;Cui Yong;Zhang Sujie(Shanghai University of Electric Power,Shanghai 200090,China;Electric Power Research Institute of Shanghai Municipal Electric Power Company,Shanghai 200437,China;State Grid Pudong Power Supply Company,SMEPC,Shanghai 200122,China)
出处
《电测与仪表》
北大核心
2020年第13期55-60,111,共7页
Electrical Measurement & Instrumentation
