连续换相失败对大电网功角稳定影响分析  

Analysis of Successive Commutation Failure Influence on Power Angle Stability of Large Power Grid

作　　者：朱元振 马欢 姜力扬 周宁 蒋哲 ZHU Yuanzhen;MA Huan;JIANG Liyang;ZHOU Ning;JIANG Zhe(State Grid Shandong Electric Power Research Institute,Jinan 250003,China;State Grid Yantai Power Supply Company,Yantai 264001 Shandong Province,China)

机构地区：[1]国网山东省电力公司电力科学研究院,山东济南250003 [2]国网山东省电力公司烟台供电公司,山东烟台264001

出　　处：《山东电力技术》2024年第4期56-63,共8页Shandong Electric Power

基　　金：国家自然科学基金项目(52177096)。

摘　　要：连续换相失败对交直流大电网的安全稳定运行存在严重威胁,容易引发跨大区电网的连锁故障。采用理论分析和实际电网仿真相结合的方式研究连续换相失败对交流系统功角稳定性的影响。首先从交直流系统无功功率交换的角度,分析连续换相失败的形成原因。然后以简化的三区域交直流互联系统为例,基于等面积法则分析连续换相失败过程中交流系统同步发电机相对功角的变化情况。最后,仿真分析当绍兴换流站发生连续换相失败时,送端电网和受端电网功角变化情况。仿真结果表明,连续换相失败在短时间内对交流系统造成多次能量冲击,长时间的连续换相失败会造成交流系统功角失稳。Successive commutation failure is a serious threat to the safe operation of large AC/DC power grid,which may lead to cascading failures across regional power grids.The influence of successive commutation failures on the power angle stability of AC systems was studied by combining theoretical analysis and actual power grid simulation.Firstly,from the perspective of reactive power exchange in AC/DC systems,the cause of successive commutation failure was analyzed.Then,taking a simplified three zone AC/DC interconnected system as an example,the variation of the relative power angle of the synchronous generator in the AC system during the successive commutation failure process was analyzed based on the equal-area criterion.Finally,simulation analysis was conducted on the power angle changes of the sending-side power grid and the receiving-side power grid when the successive commutation failure occurs at the Shaoxing converter station.Simulation results show that successive commutation failure can cause multiple energy shocks on the AC system in a short period of time.Long-term successive commutation failure is able to result in power angle instability of the AC system.

关 键 词：连续换相失败 功角稳定 等面积法则 连锁故障 

分 类 号：TM722[电气工程—电力系统及自动化]