摘要
研究了基于FFT理论的电力谐波检测原理,提出一种基于相位差校正法的高精度电力谐波检测方法。文章首先从FFT的基本理论出发,推导出FFT频谱相位差校正的理论公式,给出利用该方法检测电力谐波的操作步骤。接着利用MATLAB分别仿真了基于该方法和直接FFT法的电力谐波检测精度。结果表明,该方法能够明显的提高检测精度,可以满足实际的电力谐波检测。
After studying on the measurement principle of power system harmonic based on FFT theory, this paper presents a high-accuracy method based on phase difference correcting to measure the harmonic. First, theoretic formulas are deduced on the basic theory of FFT. Then the operating sequence using these formulas is proposed in this paper for power system harmonic measurement. Finally, by use of MATLAB, two methods are simulated, one based on phase difference correcting, the other on FFT. The simulation results show that the former greatly improves the measurement precision and can meet the actual use demand.
出处
《电测与仪表》
北大核心
2007年第2期13-15,28,共4页
Electrical Measurement & Instrumentation
