改进型单位功率因数谐波检测算法在三相并联型APF中的应用研究

Study of application of harmonic detection algorithm with improved unit power factor in three-phase shunt APF

为了降低电网电压不对称或畸变对UPF谐波检测算法的影响,通过引入锁相环电路的改进型UPF谐波检测算法产生基波正序电压,对有功功率进行修正,抑制了电压畸变的影响,同时提高了检测的实时性。在Matlab上对补偿前后电源侧电流波形进行对比研究,验证了改进型UPF谐波检测算法的可行性。实验结果表明,采用改进算法后,电源侧电流谐波成分中谐波含量最高的5次谐波含量由补偿前的22.8%降低为补偿后的8.1%,负载电流主要次谐波成分得到了有效抑制,实现了抑制谐波的目的。

In order to reduce impact of grid voltage asymmetry or distortion on UPF harmonic detection algorithm, an improved UPF harmonic detection algorithm introducing PLL circuit was used to produce fundamental positive sequence voltage and correct active power, which inhibited impact of voltage distortion, while improved real-time performance of detection. Current waveforms of the power supply side before and after the compensation were compared by Matlab, which verifies feasibility of the improved harmonic content is reduced from 22.8 that harmonic content of the fifth before the compensation to 8.1 improved algorithm, and the main harmonic component of the load current which achieves purpose of harmonic suppression. armonic which has the highest after the compensation by the has been effectively inhibited,