有源电力滤波器谐波电流的检测方法综述

Review of Harmonic Detection Methods for Active Power Filters

电网谐波污染日益严重,有源电力滤波器作为谐波抑制的理想解决方案受到广泛的关注。谐波电流的检测性能很大程度上影响有源电力滤波器的补偿效果。根据谐波检测方法依据的理论不同,分为基于功率定义和数字信号处理技术两大类。基于功率定义的谐波检测方法有基于Fryze功率定义、瞬时无功功率理论、同步旋转坐标系、直流侧电压控制等;基于数字信号处理技术的谐波检测方法有基于傅利叶变换、广义积分器、Prony/Kalman估计、小波/S变换、神经网络/自适应滤波。文章详细对谐波检测方法进行归类总结和比较分析,指出了各自的优缺点和适用范围。

Harmonic quality of power network has which is effective for harmonic suppression, has become increasingly deteriorated. The use of active filtering techniques, more attractive. One of the key points for proper implementation of an APF is to use a reliable method for current/voltage reference generation. Harmonic detection methods are divided into two categories, based on power definition and digital signal process theories. The power definition theories include Fryze power definition, instantaneous reactive power, synchronous rotating coordinate system, voltage-controlled DC, etc. The digital signal process theories include Fourier transform, generalized integrator, Prony/Kalma estimation, wavelet/S transform, neural network/adaptive filtering, etc. This article gives a survey of the commonly used methods for harmonic detection in active power filters, and presents their advantages, disadvantages and application scope respectively.