应对多回并列直流换相失败的送端系统安全稳定控制措施研究  

Research on the Security and Stability Control Measures of the Sending Side System Coping With Multiple Parallel-operation HVDCs Simultaneous Commutation Failure

作　　者：贾俊川[1] 张健[1] 仲悟之[1] 屠竞哲[1] 于强[1] 易俊[1] 

机构地区：[1]中国电力科学研究院,北京市海淀区100192

出　　处：《中国电机工程学报》2017年第21期6320-6327,共8页Proceedings of the CSEE

摘　　要：大容量特高压直流工程的陆续投运进一步加剧电网"强直弱交"特性,送受端系统的耦合作用和相互影响愈发显著,受端系统故障引发的多并列直流同时换相失败会对送受端电网造成巨大的冲击,严重挤压送端电网稳定运行空间,若电网稳定裕度较低,甚至会导致全网崩溃,因此需针对多并列直流送出系统同时换相失败采取一定的安全稳定控制措施。基于三区域交直流互联系统等值模型,该文从机理分析角度提出应对多回直流同时换相失败故障冲击下互联系统安全稳定控制措施,并针对换相失败故障的特殊性对控制措施的适应性进行了分析,最后基于"三华"实际电网算例对控制措施的有效性进行仿真验证。The characteristic of ＂strong DC and weak AC＂ of the power gird is further presented as the HVDC projects are gradually putted into operation. The coupling and interaction between the sending-side and the receiving-side AC systems is becoming more and more significant, and thus the multiple parallel-operation HVDCs simultaneous commutation failure trigged by faults of the receiving side power grid is able to cause huge power impact to the sending and receiving side power system and bring a series of stability problems. If the grid stability margin is low, it can even cause the whole network to collapse. In order to expand the stable operating space of the sending-side grid, some security and stability control measures are likely to be adopted aiming to decrease the impact of the simultaneous commutation failure of multiple parallel-operation HVDCs. Based on the three-area AC/DC equivalent model, this paper firstly proposed several kinds of security and stability control measures aiming to improve the capability of the sending side system to maintain stable operation after multi-HVDC simultaneous commutation failure from the angle of mechanism analysis. And then adaptability of the control measures proposed was presented. Finally, the control measures are verified by the simulation results on the basis of the ＂North China-Central China-East China＂ power grid case system.

关 键 词：多并列直流 换相失败 安全稳定控制措施 机理分析 

分 类 号：TM73[电气工程—电力系统及自动化]