低频振荡下发电机响应特性的量化分析

Quantitative Analysis of Generator Response Characteristic Under Low-frequency Oscillation

发电机在系统振荡下的响应特性是合理、有效设计控制策略的基础。借鉴机械振动中阻尼运动的描述方法,将低频振荡下发电机主要变量的运动归纳为阻尼振荡和临界阻尼两种基本运动形态;介绍了从仿真数据提取阻尼参数建立参数运动模型的方法,实现对发电机振荡特性的量化分析;提出一种系统侧低频振荡信号的近似模拟方法,并应用于发电机响应仿真,获得了主要变量的运动模型和阻尼参数;分析了系统侧振荡幅度、频率以及初始工况对发电机功角振荡的影响。仿真研究表明,这一量化分析方法能直观有效地描述发电机参数的动力学行为。

Quantitative analysis of the response characteristic of generator under low-frequency oscillation is basic for the appropriate design of control strategy. Based on description method of damping motion in mechanical vibration, variables movement of generator are divided into two basic motion models：damping oscillation and critical damping motion. Detail methods of extracting damping parameters from simulation data is introduced to establish variable motion models. An approximate method is put forward to simulate low-frequency signal and generator response characteristic, from which motion models and damping parameters of main variables are obtained. The influences of oscillation amplitude, frequency and initial operating point of power system to the motion damping parameters are analyzed. Simulation indicates that this method is illustrative and valid.