中文摘要：

采用一种适合于三相四线制不对称负载的谐波检测方法,使得逆变器仅需补偿无功及谐波电流而降低了开关器件容量的选取值。将比例调节与重复控制理论相结合,设计了电流双环重复控制系统,提高了电流环跟踪的快速性与稳态精度。通过MATLAB仿真验证了该谐波检测算法可顺利分离出各相无功及谐波电流,且控制算法具有快速和高稳定性。通过搭载DSP芯片作为主控系统的实验平台验证实际补偿效果,三相网侧电流谐波畸变率分别由补偿前的54.4%、59.2%、65.2%降低至补偿后的2.6%、3.2%、4.4%,证明所提出的检测及控制方法具有实用性和高稳定性。

英文摘要：

A harmonic detection method suitable for the asymmetric load of three-phase four-wire system is presented,with which,only the reactive and harmonic currents are compensated by the inverter,resulting in the reduced switching device capacity. Based on the proportional regulation and repetitive control,a dualloop repetitive control system is designed to improve the tracking speed and steady precision of current loops. The results of MATLAB simulation show that,the reactive and harmonic current is successfully separated for each phase by the harmonic detection algorithm and the control strategy has fast speed and high stability. An experimental platform with a DSP chip as its main control system is built to verify the actual compensation effect. The grid-side current THD of three phases are reduced from 54.4 %,59.2 %,65.2 %（without compensation） to 2.6 %,3.2 %,4.4 %（with compensation） respectively,verifying the practicality and high-stability of the proposed detection method and control strategy.