一种基于直接电流控制的单相PWM整流器-《集美大学学报（自然科学版）》

文章信息/Info

Author(s):: LIU Xiangyu; WANG Rongjie; ZHOU Haifeng; (School of Marine Engineering，Jimei University，Xiamen 361021，China)

Keywords:: PWM rectifier; Double closed loop control; AC side voltage feedforward; Unitypower factor

摘要:: 为了解决传统PWM整流器中存在的严重谐波污染，以及电流相位滞后的问题，提出一种基于直接电流控制的双闭环控制策略，在传统双闭环PI控制策略的基础上加入了交流侧电压前馈环节。为了实现交流侧电流正弦化，虚构了一个与交流侧电压相差90°的电压,通过锁相环技术实现交流电压相位跟踪。实验结果表明：交流侧能够以近似单位功率因数运行，直流侧电压超调量小且输出稳定。

Abstract:: Aiming at the problems of serious harmonic pollution and current phase lag in traditional PWM rectifier，a double closed loop control strategy based on direct current control is proposed.The AC side voltage feedforward link was added to the traditional double closed loop control strategy.In order to realize the sinusoidal AC side current，a virtual voltage with 90° difference between AC side voltage and AC side voltage was fabricated，and the phase tracking of AC voltage was realized by phase-locked loop technology.The simulation results show that the AC side can operate in unit power factor，the DC side voltage overshoot is small and the output is stable，which indicates that the control strategy is reasonable and can be effectively controlled.