基于结构保留模型的低频振荡功率增量分布计算与分析  

Calculation and analysis of the low frequency oscillatory active power increment distribution based on structure-preserving model

作　　者：蔡国伟[1] 杨德友[2] 郭健[1] 张俊丰[1] 

机构地区：[1]东北电力大学电气工程学院,吉林吉林132012 [2]华北电力大学电气与电子工程学院,北京102206

出　　处：《电力系统保护与控制》2011年第8期46-50,55,共6页Power System Protection and Control

基　　金：国家自然科学基金项目(50777007)~~

摘　　要：基于电力系统结构保留模型,构建了计及详细发电机模型、励磁系统模型和负荷频率特性模型的电力系统状态方程,并利用计算线性化状态矩阵得到的特征值和特征向量,建立了求解低频振荡中的功率振荡增量在网络中的分布的计算方法。计算所用模型均在极坐标下建立,回避了传统方法中繁琐的坐标变换。该方法不仅可以计算低频振荡过程中发电机、支路和负荷处振荡功率增量的分布情况,而且可以分析负荷动态特性对功率振荡的影响。对四机算例系统进行仿真与分析,算例结果表明所提算法在准确地计算各机电振荡模式的振荡功率增量分布情况的同时能够分析负荷频率特性对振荡功率增量分布的影响。Based on the structure-preserving model of power system,the power system state equation considering the detailed generator model,excitation system model and load frequency character model is developed.The novel method for calculating low frequency oscillatory active power increment distribution by employing the eigenvalues and eigenvectors obtained through the linearized state matrix is presented.The proposed model is established based on the polar coordinates,avoiding the redundant coordinate transfer of the traditional method.The method not only can be applied to calculate oscillatory active power increment distribution over generators,transmission lines and loads,but also can be used to analyze the effects of dynamic load character on power oscillation.Simulations carried on four-machine example system testify that the effects of load frequency character on power system low frequency oscillatory can be analyzed while the oscillatory active power increment distribution is accurately calculated.

关 键 词：电力系统 低频振荡 机电模式 结构保留模型 振荡功率 动态负荷模型 

分 类 号：TM744[电气工程—电力系统及自动化]