摘要
非线性元件的大量使用使得电力系统谐波日益增多,造成过电压、过负荷等问题,而谐波的监测和分析是治理谐波的前提条件,对此利用快速傅里叶变换FFT对构造的四种电力系统信号模型进行频谱分析。结果表明,FFT可很好地识别幅值固定不变的谐波分量,并可抑制系统中高斯白噪声的干扰,但在谐波幅值发生变化或信号频率不固定时,并不能准确获取信号频谱,需对其进行改进研究。
The wide use of non-linear components leads to an increasing harmonic wave in the power system,which brings a series of problems such as overvoltage and overload.The monitoring and analysis of harmonic wave is the prerequisite to control harmonic wave.In this paper,we use FFT（Fast Fourier Transform）method to analyze the spectrum of four signal models in power system.The results show that FFT method can well identify harmonic components with fixed amplitude,and inhibit the interference of Gaussian white noise in the system.However,when the harmonic amplitude is changed or the signal frequency is not fixed,the FFT method cannot accurately obtain the signal spectrum.It needs to be improved.
作者
赵航宇
毛王清
ZHAO Hangyu;MAO Wangqing(State Grid Jiangsu Electric Co.,Ltd.,Suqian Electric Power Company,Suqian 223800,China)
出处
《电工技术》
2018年第13期5-8,共4页
Electric Engineering
