基于LCL滤波的三相电压型PWM整流器研究  

Research of Three-phase Voltage Source PWM Rectifier Based on LCL Filter

作　　者：王浩宇[1] 宋文祥[1] 曹大鹏[1] 吴春华[1] 

机构地区：[1]上海大学机电工程与自动化学院,上海200072

出　　处：《电气传动》2015年第3期16-20,共5页Electric Drive

基　　金：国家自然科学基金项目(51107079)

摘　　要：采用LCL滤波器代替传统L型滤波器能够提高滤波效果减小所需电感量。但LCL滤波器本身存在谐振问题,如不能抑制谐振会导致系统不稳定。研究了一种虚拟电阻串电容的有源阻尼控制策略,通过采样LCL滤波电容电流并与s Cf Rd相乘,将计算结果叠加到电压外环的输出电流指令上,然后经过PI调节器实现有源阻尼控制。这种控制策略能够很好的抑制谐振,减小系统电流总谐波畸变率,降低损耗提高系统的动态响应,增加系统的稳定性。仿真结果证明了该方法的正确性和可行性。Using the LCL filter instead of the traditional L filter can improve the filtering effect and reduce therequired inductance. However,the LCL filter has the resonance problem. If we can not restrain Harmonic resonance,itwill cause system instability. The active damping control strategy of a virtual resistor in series capacitor was studies.Sampling LCL filter capacitor current and multiplied by s CRf d,the results will be added to the output current commandof voltage outer loop.The active damping control will be realized by PI controller. This control strategy can restrainresonance well,reduce the current total harmonic distortion system rate,cut down the loss,improve the dynamicresponse and increase the stability of the system. Simulation results in Matlab/Simulink environment prove thecorrectness and feasibility of the method.

关 键 词：LCL滤波器 有源阻尼 虚拟电阻 谐振 

分 类 号：TM461[电气工程—电器]