振荡能量分析和特征值分析的联系及发电机阻尼评估  

Relationship Between Oscillation Energy Analysis and Eigenvalue Analysis and Assessment of Generator Damping

作　　者：陈磊[1,2] 闵勇[1,2] 陈亦平[3] 卢明富[3] 张宇童[3] 

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》2013年第19期33-40,共8页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(51007043);南方电网公司重点科技项目(K-ZD2012-015)~~

摘　　要：振荡能量分析是一种新的低频振荡分析方法。研究了振荡能量分析和特征值分析之间的联系。明确了发电机内部的能量流动,然后基于特征值和特征向量表示系统变量轨迹并计算振荡能量消耗,定义了发电机能量消耗系数。振荡模式特征值实部与所有发电机能量消耗系数之和成比例,比例系数为负数,即特征值实部与总能量消耗反号,系统的阻尼比来源于各台发电机的能量消耗。单机无穷大系统中,发电机能量消耗系数等于阻尼转矩系数。多机系统中,发电机的能量消耗系数可定量评估其阻尼特性。仿真结果验证了结论的有效性,为基于振荡能量的低频振荡分析方法奠定了基础。Oscillation energy analysis is a new method for low frequency oscillation analysis. The relationship between oscillation energy analysis and eigenvalue analysis is studied. The energy flow in the generator is clarified. The oscillation energy dissipation is then computed based on the results of eigenvalue analysis, and the energy dissipation coefficient of a generator is defined. The real part of the eigenvalue of an oscillation mode is negatively proportional to the sum of energy dissipation coefficients of all generators. The real part of the eigenvalue and the total energy dissipation are opposite in sign, and the damping ratio of the system comes from the energy dissipation of each generator. In a one-machine infinite-bus system, the energy dissipation coefficient is equal to the damping torque coefficient. In a multi-machine system, the energy dissipation coefficients can be used for quantitative assessment of generator damping. The conclusions are verified by simulation results, laying a solid foundation for the oscillation energy analysis method.

关 键 词：低频振荡 特征值分析 振荡能量 能量消耗 阻尼 

分 类 号：TM712[电气工程—电力系统及自动化]