应用自适应陷波滤波器进行电力系统谐波检测的改进算法

An Improved Algorithm for Harmonic Detection of Power System Using Adaptive Notch Filter

非线性电力电子设备的广泛应用给电网带来了严重的谐波污染,如何抑制谐波危害已成为电力电子领域急待解决的问题。实时准确的检测谐波是抑制和补偿谐波的关键。首先分析了电网电压含有直流分量与电网电压幅值变化对基于自适应陷波滤波器的谐波提取方法的影响,并对原方法进行了改进;再将改进后的方法应用到谐波提取中,在电网电压同时含有直流分量且幅值改变时,实现了对直流分量、基波频率、各次谐波瞬时值与幅值的准确提取。在Matlab/Simulink环境下的仿真结果验证了所提出方法具有较高的精度与响应速度。

The wide use of nonlinear power electronic equipment brings out serious harmonic pollution in grid. Restricting harmonic pollution becomes an urgent problem to be solved. The key to restrict and compensate harmonic is to detect harmonic accurately and timely. Firstly, the effect of direct component and changed amplitude on harmonic detection using adaptive notch filter is amalyzed, and a modified adaptive notch filter is designed. Then modified adaptive notch filter can accurately extract direct component, fundamental frequency, harmonic instantaneous value and amplitude when grid includes direct component and changes amplitude. The result of Matlab/Simulink simulation shows that the above-mentioned approach is effective.