摘要
电力系统小干扰稳定分析的实质是系统近似线性化后所得的定常时不变系统的分析,系统的时域解特性使得仿真曲线的阻尼表征了系统的振荡模态。基于这一特性,本文提出一种基于时域仿真的小干扰稳定分析方法。该方法通过直观分析系统的时域仿真曲线的收敛程度,快速判定系统的小干扰稳定性,无需对系统状态矩阵进行特征值求解,进而避免了特征值求解方法存在的各种不足,为电力系统小干扰稳定在线分析提供了一种新的依据。并对系统的仿真曲线采用HHT方法进行波形分析,得到系统的最小阻尼比来体现系统稳定裕度。最后,分别对WSCC3机9节点小系统及某地区实际大电网的某个时间点的典型运行方式下的算例进行仿真实验,验证所提方法的有效性。
The small signal stability analysis is the analysis of a linear time-invariant system that is based on the approximate linearization of the original system. According to the characteristic of time-domain solutions which illustrates the embodiment of the system oscillation mode by the damping characteristics of the simulation curve,this paper proposes a method of small signal stability analysis based on time domain simulation. The proposed method rapidly determines the small signal stability by analysis of the degree of convergence of the time domain simulation curve of the system without the need of system state matrix eigenvalue calculation. So this method can avoid all the shortcomings of the method of eigenvalue solution,which provides a new way for the online analysis of power system small signal stability. Then,the HHT method is employed to analyze the waveforms of the simulation to obtain the minimum damping ratio which can reflect the system’s stability margin. Finally,the validity of the proposed method is illustrated by simulation of a WSCC3 system with 9 buses and a calculation example of a typical operating mode on a certain time point of a large grid.
出处
《电工电能新技术》
CSCD
北大核心
2017年第1期44-51,共8页
Advanced Technology of Electrical Engineering and Energy
基金
国家自然科学基金项目(51541707)
关键词
电力系统
振荡模态
时域仿真
小干扰稳定
阻尼比
HHT
power system
oscillation mode
time domain simulation
small signal stability
damping ratio
HHT
