摘要
电力系统低频振荡已影响到电网的安全稳定,对此提出了一种基于加窗插值快速傅里叶变换(fast Fourier transform,FFT)模式分析法。该方法采用海明窗进行低频振荡信号加权分析以减少FFT算法的频谱泄漏,且通过对比前后两次谱分量幅值差异来确定模态阻尼因子,再利用双峰谱线插值算法减少栅栏效应的影响,同时使用多项式逼近求解主导模式的频率。仿真结果表明,该方法可有效分析低频振荡的主导模态参数,计算量较少,并对含白噪声的信号具有较好的鲁棒性。
Aiming at the problem that low frequency oscillation of the power system has affected security and stability of the power grid,a kind of mode analysis method based on windows and interpolated fast Fourier transform（FFT）is proposed.This method uses Hamming for weighted analysis on low frequency oscillation signals so as to reduce frequency spectrum leakage of FFT algorithm,and by comparing two successive differencesof spectral component amplitudes,it can confirm modal damping factors.Double spectral lines interpolation algorithm is used for reducing influence of picket fence effect and polynomial approximation is used to solve frequency of the dominant mode.Simulation results indicate that this method is able to effectively analyze parameters of the dominant mode of low frequency oscillation which is of less calculated amount and has better robustness on signals containing white noise.
出处
《广东电力》
2016年第3期61-66,共6页
Guangdong Electric Power
关键词
低频振荡
频谱分析
快速傅里叶变换
窗函数
low frequency oscillation
frequency spectrum analysis
fast Fourier transform（FFT）
window function
