基于低开关损耗新型滞环PWM整流器研究

摘要

针对三相高功率因数整流器的控制要求和实际工程条件,进行了基于低开关损耗的三相PWM整流器研究,系统采用了负载电流前馈的电流滞环控制策略.该系统不仅改进了传统滞环控制策略带来的高开关频率的问题,更引入了负载电流前馈控制,使得系统对于外环的PI参数有着较传统滞环PWM整流器更低的依赖性,在三相电网不平衡的条件下也表现更好的运行特性.仿真波形和实验数据都验证了该控制方法的有效性以及对PI调节参数的低依赖性.%According to the control requirement and actual project conditions of three-phase high power fac-tor rectifier, the low switching losses three-phase PWM rectifier which adopts hysteresis current control strat-egy based on load current feed-forward control was researched. The system not only improve the high-frequen-cy switching problem brought by conventional hysteresis control strategy, but also adopts load current feed-forward control to make the system has much lower dependence on the PI parameters of the outer voltage regu-lator than conventional hysteresis current control PWM rectifiers. The system works well even under unbal-ance power conditions. Simulation and experimental data both confirm the validity of the new control strategy.