串补输电系统中次同步谐振的模态阻尼推导  

Modal Damping of Subsynchronous Oscillation on Compensated Transmission Systems

作　　者：张东辉[1] 谢小荣[1] 刘世宇[1] 杨庭志[1] 

机构地区：[1]清华大学电机系,北京市100084

出　　处：《电力系统自动化》2008年第6期5-8,共4页Automation of Electric Power Systems

基　　金：国家重点基础研究发展计划(973计划)资助项目(2004CB217906)~~

摘　　要：串补输电系统中次同步谐振的模态阻尼分析主要采用复转矩系数法和特征根分析方法,但都需要复杂建模,且只能从大量计算结果中得到次同步谐振发生的规律,不能给出直观的机理解释。文中在系统等效为单机无穷大系统的情况下,推导出多模式次同步谐振各扭振模式阻尼的显式表达式。经验证,可以较精确地近似特征根分析的结果。该表达式在理论上有助于进一步理解次同步谐振的机理和系统参数对次同步谐振的影响,在工程应用上可用于快速、方便地分析各种运行条件下次同步谐振的风险及其严重程度。The complex torque coefficient method and eigenvalue analysis are two main methods for analyzing the modal damping of subsynchronous resonance （SSR） in compensated transmission systems. However, both methods need complicated and detailed models of full system, and the conclusions can only be summarized from the large amount of calculating results without intuitionistic explanations. An explicit mathematical expression of multi-mode SSR torsional damping in an equivalent singlemachine infinite-bus system is deduced and verified by comparing with the results of eigenvalue analysis. This obtained formulas are helpful to better understand the principle of SSR and the influence of different system parameters on SSR. Moreover, it also provides an efficient method to quickly assess the risk and severity of SSR in practical engineering applications.

关 键 词：多模式次同步谐振 特征值分析 模态阻尼 串补输电系统 

分 类 号：TM72[电气工程—电力系统及自动化]