有源电力滤波器谐波及无功电流的检测

准确、迅捷检测出系统电流中的谐波及无功成份，是保证有源电力滤波器（APF）能适时补偿的关键，由于传统检测方法系统复杂，所需器件多，因此从傅立叶变换出发，提出了一种新型的谐波及无功电流检测方法；基波有功分量剔除法，该方法由于算法简单，所用器件少，适时性较高，不仅能适用于单相电路，而且也适用于三相电路，理论分析和仿真研究表明，该方法能适时准确地检测出谐波及无功分量。

Detecting Method for Harmonics and Reactive Currents in Active Power Filter

Detecting the harmonics and reactive current exactly and promptly is the key of the APF's timing compensation. For the traditional detecting system is very complex and needs numerous components, this paper presents a new detecting method for harmonics and reactive current, according to Fourier transform, in active power filter based on elimination of the real part of the fundamental load current. The system structure derived from this algorithm is simple and requires lesser components, at the same time, has a finer timing performance. It not only fits for single phase circuit, but also for three phase circuit. The theory analyses and the results of simulations show that this technique can detect the harmonics and reactive current timely and preciously.