利用发电机转速实时识别两群暂态功角失稳  

Real-time Identification of Transient Angle Instability in Two Machine Groups Using Angular Velocities

作　　者：王志文 孙华东 易俊 赵兵 徐式蕴 WANG Zhiwen;SUN Huadong;YI Jun;ZHAO Bing;XU Shiyun(China Electric Power Research Institute,Haidian District,Beijing 100192,China)

机构地区：[1]中国电力科学研究院有限公司,北京市海淀区100192

出　　处：《电网技术》2020年第7期2634-2641,共8页Power System Technology

基　　金：国家自然科学基金项目(51777195,U1766202,51977197)。

摘　　要：针对特高压直流配套电源存在的两群暂态失稳问题,提出了一种基于发电机转速数据识别暂态功角稳定性的新方法。首先,在单机无穷大系统中发现了暂态功角失稳时发电机转速的特征,并证明该特征与暂态失稳的严格对应关系,提出了易于工程实现的失稳判据;然后,基于互补群惯量中心变换,将该失稳判据用于识别多机系统的两群失稳模式。在实际大电网中对所提方法进行测试,结果表明,该方法能够有效甄别暂态功角失稳,具备量测信息少、计算简便快速的优点。In view of the transient instability for two group machines of UHVDC projects,this paper proposes a new online identification method for transient angle stability based on angular velocities.First,a unique feature of generator velocities is discovered in single-machine-infinite-bus system.Then,this unique feature is proved to be able to effectively indicate instability,based on which a practical stability criterion is proposed.Thereafter,the stability criterion is extended to apply to multi-machine systems using complementary-cluster center-of-inertial.Extensive tests on China Power Grids demonstrate the effectiveness of the proposed method.The proposed method is verified to be effective in identifying transient angle instability.It has the advantages of less data needed and simpler and faster computation in scalability.

关 键 词：电力系统 暂态功角稳定 在线监测 转速 

分 类 号：TM721[电气工程—电力系统及自动化]