摘要
电力系统的频率时刻处于波动状态,采样不可能做到完全同步,基于离散傅立叶变换(DFT)的算法不可避免的存在频谱泄露和栅栏效应,导致测量的精度无法满足电力系统参数的精度要求。介绍了一种改进的DFT频率测量算法,通过选择合适的窗函数和相位差校正的方法来提高频率测量的精度。仿真分析表明,该算法达到了电网频率测量的标准,具有一定的可行性和有效性。
The frequency of the power system is always fluctuating, which makes the sampling signals non-synchronous. And the spectral leakage and hurdle effect of DFT algorithm will result in obvious measurement errors, so the accuracy of measurement cannot meet the requirements. This paper introduces an improved DI＇~F algorithm. The appropriate window functions and Phase Difference Correcting method are applied to obtain the precision frequency of the power system. The simulation results show it can meet the requirement of measurements for power system an it is effective and practicability.
出处
《电网与清洁能源》
2009年第7期34-38,共5页
Power System and Clean Energy
关键词
离散傅立叶变换
窗函数
相位差校正
电网频率
discrete Fourier transform （DFT）
window functions
phase difference correct
frequency of power system
