多机系统超低频振荡分析与等值方法  

Analysis of Ultra-low-frequency Oscillations in Multi-machine System and Equivalent Method

作　　者：陈磊[1,2] 路晓敏[1,2] 陈亦平[3] 闵勇[1,2] 张勇[3] 唐卓尧 

机构地区：[1]清华大学电机工程与应用电子技术系,北京市100084 [2]电力系统及发电设备控制和仿真国家重点实验室清华大学,北京市100084 [3]中国南方电网电力调度控制中心,广东省广州市510623

出　　处：《电力系统自动化》2017年第22期10-15,25,共7页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(51377002);中国南方电网有限责任公司科技项目~~

摘　　要：实际电力系统中多次发生的超低频频率振荡在振荡形式及机理上与低频振荡存在显著区别。在多机系统中对超低频频率振荡问题进行了分析。超低频频率振荡中,所有发电机转速同调变化,系统频率整体振荡。提出一种适用于超低频频率振荡分析的系统等值方法,将多机系统等值为单机单负荷系统进行分析,提高计算效率。各发电机原动系统的阻尼转矩相互解耦,和电磁功率中的阻尼转矩加和后共同影响系统阻尼比。研究结果可为实际系统超低频频率振荡的分析与控制提供指导。There are significant differences in the oscillation performance and the mechanism of the ultra-low-frequency frequency oscillations（ULFFO）from that of low frequency oscillations.The ULFFO problem is analyzed in the multi-machine system.In the ULFFO,all of generator speeds change coordinately.As a consequence,the system’s frequency oscillates together.An equivalent method for ULFFO analysis is proposed to increase computation efficiency,in which the multi-machine system is equivalent to a single-machine system.Damping torques in the prime mover systems of the generator are decoupled.The sum of them and the damping torques in the electromagnetic power affect the damping ratio of the system.The results provide guidance for the analysis and control of ULFFO in the actual system.

关 键 词：超低频频率振荡 有功频率控制 一次调频 小扰动稳定 振型 单机等值 原动系统阻尼 

分 类 号：TM712[电气工程—电力系统及自动化]