基于滑�？刂频娜�電平PWM整流器建模及仿真

摘要：建立了中點箝位三電平PWM整流器的數學模型，為提高系統直流環節動態響應，設計了基于PI調節的電流內環和滑模變結構的電壓外環的雙閉環控制器。仿真結果表明：該PWM整流器可以有效抑制諧波，實現網側單位功率因數控制，與常規PI控制器相比，滑�？刂破鞯膽�用使得直流環節的動態性能得到明顯改善。 敘詞：三電平 PWM整流器 滑�？刂� 動態響應 Abstract：In this paper, the mathematical model of three-level rectifier is constructed, and the sliding-mode control strategy is studied. A double closed-loop control system based on current closed-loop of PI regulator and voltage closed-loop of the sliding-mode control　regulator had been designedThe results of the emulation and the experiment were present. The experiment showed that the rectifier could effectively restrain the harmonic pollution and the system presents better dynamic and static characters Keyword：Three-level, PWM rectifier, Sliding-mode control, Dynamic response