一种新型谐波与无功电流检测方法

A Novel Method for the Detection of Harmonic and Reactive Components of Currents

谐波电流的快速精确检测是有源电力滤波器滤波性能的关键指标,现有的谐波检测方法并非很理想。文中提出一种适用于有源电力滤波器的补偿电流检测新方法,该方法通过瞬时有功功率计算出负载基波正序有功电流幅值,然后乘以单位电压幅值的电源波形,得到基波正序有功电流的瞬时值,进而分离出待补偿电流分量;建立了基于PSIM的仿真系统,针对不同负载性质和负载电流突变等情况进行了分析。仿真结果表明,该方法能够准确、快速地检测出负载电流中的谐波和无功电流分量。

Fast and precise detection of harmonic currents is the key performance factor of active power filter （APF）, and the existing detection methods of harmonic currents are not satisfied. In this paper,a novel harmonic current detecting method for active power filter （APF） is presented. By this method, the amplitude of fundamental positive-sequence active component of load current （I1p） is calculated according to instantaneous real power caculation, and then multiplied by the source voltage reference to obtain the instantaneous active load current and compensation current components. A simulation model based on PSIM is introduced, and simulation study with different load characteristics and fluctuating load condition is carried out. Simulation results show that this method can quickly and accurately detect the harmonic and reactive components of the load current.