CAJ | 학술논문

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。
수착대용량고압직류축보투운，전망진일보정현“강직약교”특성，대규모직류호련적송、수단교류계통적우합작용화상호영향축점돌현。해문이삼구역교직류등치모형위기출，분석료불동공솔류향정황하다회직류환상실패대송단계통은정성적영향，진일보토론료관건영향인소급응대조시，병여단회직류폐쇄고장진행료대비분석，최후채용“삼화”실제전망산례진행험증。연구결과가이위보증특고압교직류혼련전망적안전은정운행제공의거화삼고。
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.