一种新型的单次谐波快速分析方法

A Fast Analysis Method of Single Harmonic

探讨的单次谐波快速检测法是单相谐波快速检测法的改进。若要检测电网中第k(k为整数)次谐波的含量,传统的FFT检测法要对周期信号进行整周期的采样,而该方法只需前1/(4k)周期的信号值,就可求出第k次谐波的含量。经实验证明,将该方法用于可控单调谐滤波器进行谐波检测时,其运算速度快,延时短;同时能够实时检测电网中谐波的变化,使无源滤波器的滤波效果具有高度可控性和快速响应性。

The rapid detection method of single harmonic discussed was improved from the detection method of single phase harmonic.When detecting the k-th order harmonic component of electric power network, the entire cycle signal must be sampled with the traditional detection method of FFT.However,only the first 1/（4k） cycle signal was known,the k-th order harmonic component of electric power network can be easily obtained with this method.The experiments show that when this method is applied on controllable single tunable filter, high operational speed and short time delay can be got, and the changes of the harmonic can be measured in real time, so the passive filter has good performance such as high controllable and fast response ability.