时滞诱导电力系统动态调频稳定性变化的原因探究  

Investigation on Causes of Time Delay Induced Stability Change for Dynamic Frequency Regulation of Power System

作　　者：马世乾 张志君[1] 王梓[2] 蒋菱[2] 魏炜[3] 董朝宇 MA Shiqian;ZHANG Zhijun;WANG Zi;JIANG Ling;WEI Wei;DONG Zhaoyu(Electric Power Research Institute,State Grid Tianjin Electric Power Company,Tianjin 300384,China;State Grid Tianjin Electric Power Company,Tianjin 300010,China;Key Laboratory of Smart Grid of Ministry of Education,Tianjin University,Tianjin 300072,China)

机构地区：[1]国网天津市电力公司电力科学研究院,天津300384 [2]国网天津市电力公司,天津300010 [3]天津大学智能电网教育部重点实验室,天津300072

出　　处：《电力系统及其自动化学报》2019年第1期40-46,共7页Proceedings of the CSU-EPSA

摘　　要：针对电力系统动态调频过程中的时滞问题,分析给出了时滞诱导系统向不稳定状态发展的原因。首先推导了电力系统动态调频的时滞模型,分析时滞模型的结构和成分;进而通过Padé逼近处理时滞环节,将时滞和模型系数耦合建立时滞系数矩阵,用于追踪时滞系统的特征根变动轨迹。利用典型的电力系统动态调频系统发现,时滞和其所在回路的控制参数作用于相同的主导特征根,其中时滞可以通过超低频振荡的方式逐渐恶化电力系统频率的稳定性。In light of the time-delay problem in the dynamic frequency regulation of power system , the causes of insta-bility induced by time delay are given. First , a time-delay model of power system under dynamic frequency regulation is derived , and its structure and components are analyzed. Then , the time delay link is processed through the Padé ap-proximation , and a time-delay coefficient matrix is established by coupling the time-delay and model coefficients , which is further used to trace the changing locus of eigenvalues of the time delay system. With the utilization of a typical power system under dynamic frequency regulation , it is found that the time delay and control parameters for the corre-sponding loop affect the same dominant eigenvalues , and the time delay therein gradually deteriorates the frequency sta-bility of the power system through ultra-low frequency oscillation.

关 键 词：时滞 动态调频系统 超低频振荡 稳定性 

分 类 号：TM73[电气工程—电力系统及自动化]