超高压变电站接入弱交流系统的功角、电压稳定问题研究  

Study on Stability Problem of Power Angle and Voltage of EHV Substations Connected to Weak AC Systems

作　　者：卢子敬 吴启亮 贾波 李子寿 周濛 张焱哲 莫石 占佳声 LU Zijing;WU Qiliang;JIA Bo;LI Zishou;ZHOU Meng;ZHANG Yanzhe;MO Shi;ZHAN Jiasheng(State Grid Hubei Electric Power Co.,Ltd.,Wuhan 430077,China;State Grid Hubei Electric Power Company Limited Economic Research Institute,Wuhan 430077,China;Central Southern China Electric Power Design Institute of CPECC,Wuhan 430071,China)

机构地区：[1]国网湖北省电力有限公司,湖北武汉430077 [2]国网湖北省电力有限公司经济技术研究院,湖北武汉430077 [3]中国电力工程顾问集团中南电力设计院有限公司,湖北武汉430071

出　　处：《电工技术》2024年第19期173-177,183,共6页Electric Engineering

摘　　要：超高压变电站接入弱交流系统情况不可避免,故障发生后可能引起近区电网暂态稳定问题。系统失稳可能呈现电压失稳和功角失稳两种表现形式,不同运行方式下系统的稳定特征和表现形式不同。在大负荷且地区电源开机不足方式下以电压失稳模式为主导,在小负荷且电源开机较多时以功角失稳模式为主导。部分方式下两种稳定问题相互交织,共同导致系统失稳。以某超高压变电站A接入电网的情况为例,分析了系统存在的稳定问题和相关影响因素,识别了不同运行方式下系统的主导失稳模式,并制定了相应的安全稳定控制措施。Some EHV substations may be connected to weak AC systems and the resultant AC fault near the EHV substation may lead to transient stability issues in the system.There are two instability models,voltage instability and power angle instability.The stability characteristics and expressions vary under different operating modes.In the case of regional heavy load and insufficient power supply,the dominant mode is voltage instability.While in the case of light load and sufficient power supply,the dominant mode is power angle instability.In some cases,power angle and voltage stability problems are intertwined,leading to system instability.Taking the connection of an EHV substation A to the power grid as an example,this paper analyzes the stability problems and related influencing factors of the system.The dominant instability modes of the system under different operating modes are identified and corresponding safety and stability control measures are provided.

关 键 词：超高压变电站 主导失稳模式 电压失稳 功角失稳 控制措施 

分 类 号：TM63[电气工程—电力系统及自动化]