摘要
随着直流输电快速发展,交直流混联电网暂态稳定问题越来越突出,将同步运行大电网通过直流线路实现异步互联成为一种新的思路。同步大电网异步运行后,暂态稳定问题尤其对于直流闭锁故障后引发的功角稳定问题有所好转,但异步运行后暂态电压稳定风险依然存在。本文从实际运行的大电网入手,建立了同步和异步运行2种交直流混联电网的等值模型,通过理论分析和仿真计算,揭示了直流故障和交流故障导致这2种电网暂态电压失稳的风险,并探讨了影响交直流混联电网暂态电压稳定性的因素。结果表明大电网异步运行能有效避免大面积电压失稳,但系统薄弱网架或潮流分布不均处仍可能存在局部电网功角失稳或电压失稳。
With the rapid development of HVDC power transmission, the stability of AC/DC hybrid power grid is becoming more and more prominent, and it is a new way to realize the asynchronous interconnection of bulk grid with synchronous operation through HVDC. After the asynchronous operation of the bulk grid, the transient stability is improved, especially for power angle stability caused by HVDC pole blocking faults, but the transient voltage stability risks still remain in the asynchronous operation. According to actual large AC/DC power system, the paper establishes the equivalent models of the AC/DC hybrid power grid with synchronous and asynchronous operation, analyzes the risk of the transient voltage instability in both the synchronous and asynchronous operation caused by AC faults and DC faults through theoretical analysis and simulation calculation, and discusses the factors influencing the transient voltage stability of the AC/DC hybrid power grid. The results show that the asynchronous operation of the bulk grid can effectively avoid large area voltage instability, but there may still exist local power angle instability or the voltage instability in the weak network frame or with uneven power flow distribution.
作者
吴小珊
涂亮
柳勇军
吴为
赵睿
唐金锐
WU Xiaoshan1, TU Liang1, LIU Yongjun1, WU Wei1, ZHAO Rui1, TANG Jinrui2(1. Research Institute Co., Ltd. of China Southern Power Grid, Guangzhou 510080, China; 2. School of Automation, Wuhan University of Technology, Wuhan 430070, Chin)
出处
《智慧电力》
北大核心
2018年第3期1-7,48,共8页
Smart Power
基金
国家自然科学基金项目资助(51707139)~~
关键词
交直流混合系统
暂态电压稳定
异步电网
高压直流输电
暂态无功支撑能力
AC/DC hybrid power system
transient voltage stability
asynchronous grid
HVDC transmission
transient reactive powersupporting capability
作者简介
吴小珊（1988-），湖北枣阳人，女，硕士，工程师，研究方向为电力系统安全稳定控制。
