电力电子系统的无功功率补偿与谐波抑制研究

Reactive Power Compensation and Harmonic Restraining in Power Electronic System

对电力电子系统的无功功率与谐波抑制方法进行分析。包括谐波的产生、谐波和无功功率的危害、谐波分析的理论基础、非正弦电路的功率,并对并联有源电力滤波器进行了理论分析,对系统加入有源电力滤波器前后利用Matlab/Simulink分别进行仿真研究,比较功率因数和总谐波畸变率,最终满足加入有源电力滤波器后的功率因数接近1,交流侧电流总谐波畸变率小于5%。负载不对称时,加入有源电力滤波器后三相电流完全平衡。仿真结果表明,并联型有源电力滤波器在抑制谐波、补偿无功功率方面具有良好的效果。

The article analyzes reactive power compensation and harmonic restraining in power electronic system. Including the occurent of harmonic, the affect of harmonic and reactive power, the theories foundation of harmonic analysis, the power of the non- sine electric circuit, and completing the theories analysis of the active power filter, the system unjoined and joined the active electric power filter are imitated by the MATLAB, comparing the power factor and total harmonic distortion. In the end, the system with the electric power filter satisfy power factor near to 1 and the total harmonic distortion of the AC side current is small. While loads are unsymmetrical, the three phase currents of the system with the electric power filter is balanceable completely.The simulation result indicates that the parallel active electric power filter have the extremely good effect in reactive power compensation and harmonic restraining.