电流型PWM整流器有源阻尼控制的参数设计

Parameter Design of Active Damping Control for Current Mode PWM Rectifier

三相电流型PWM整流器交流侧存在LC滤波环节,该环节用来滤除网测电流谐波并且辅助开关器件换流,但是LC滤波环节存在谐振尖峰,且该尖峰会引发网侧电流畸变。针对该问题,本文提出了一种新的PWM整流控制策略,即通过有源阻尼抑制谐振尖峰,并且运用解耦控制消除耦合项对系统性能造成的影响。通过建立内外环系统框图并且对系统框图进行分析,给出了内外环控制器参数的设计方法。通过搭建实验平台,证实本文所提出方法的实用性。

The AC side of three-phase current-type PWM rectifier has LC filter link,which is used to filter out current harmonic of the grid side and help the switching device commutate,but it has resonance peak causing current distortion of the grid side.In view of this issue,a kind of new PWM rectifier control strategy is proposed in this paper,that is to suppress resonance peak through active damping and eliminate the influence of coupling items on the system performance by the use of de-coupling control.The system block diagram is analyzed by setting up internal and external loop system block diagram and analyzing the system block diagram and the design method of the inner and outer loop controller parameters is given.The practicality of the proposed method is proved by way of setting up experimental platform.