摘要
随着大容量高压直流逐步投运,电网进一步呈现"强直弱交"特性,大规模直流互联的送、受端交流系统的耦合作用和相互影响逐渐突显。该文以三区域交直流等值模型为基础,分析了不同功率流向情况下多回直流换相失败对送端系统稳定性的影响,进一步讨论了关键影响因素及应对措施,并与单回直流闭锁故障进行了对比分析,最后采用"三华"实际电网算例进行验证。研究结果可以为保证特高压交直流混联电网的安全稳定运行提供依据和参考。
As the high-voltage direct current（HVDC）s with large capacity are continually being commissioned, the characteristic of ＂strong DC and weak AC＂ of the power grid is furtherly being presented, the coupling and interaction between the sending-side and receiving-side AC systems interconnected by large-scale DC links are becoming significant. In this paper, on the base of the three-area AC/DC equivalent model, the impact of the multiple HVDC commutation failure on the stability of the sending system under different power flow directions is analyzed, the main influencing factors and the counter-measures are furtherly discussed, and the single HVDC blocking is taken to be compared. Finally, the results are verified by the ＂North China-Central China-East China＂ power grid case system. The study can provide basis and reference to ensure security and stability of the ultra-high-voltage（UHV） AC/DC hybrid power grid.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2015年第21期5492-5499,共8页
Proceedings of the CSEE
基金
国家电网公司科技项目<利用混合仿真技术的多回直流异步联网系统故障影响机理及应对措施研究>~~
关键词
直流异步互联系统
多回直流换相失败
送端系统稳定性
稳定破坏机理
high-voltage direct current（HVDC） asynchronous interconnected system
multiple HVDC commutation failure
sending-side system stability
instability mechanism
