VIENNA整流器改进同相双载波补偿控制的仿真研究

Simulation Research on the Improved PDDRCC for VIENNA Rectifier

在实际应用中,VIENNA整流器在传统的同相双载波补偿控制方式下会导致直流母线欠压起动失效和空载时直流母线电压不受控等问题。针对这些问题,研究了同相双载波补偿控制对VIENNA整流器直流母线电压的影响,提出了在原有的同相双载波补偿控制基础上引入电流极性判断和加入空载电压控制环节的控制策略,搭建了VIENNA整流器的仿真模型。仿真结果表明,系统在过渡过程中可以平稳工作,在稳态时网侧功率因数高,输入电流畸变率低,验证了所提控制策略的有效性。

In practical application,the traditional Phase Disposition Double Ramp Comparison Control(PDDRCC)mode of the VIENNA rectifier will result in the problems of DC bus undervoltage starting failure and no-load DC bus voltage uncontrolled.Aiming at these problems,the influence of PDDRCC on DC bus voltage of VIENNA rectifier was studied,and the control strategy of introducing current polarity judgmen t and adding no-load voltage control link to the original PDDRCC was put forward.The simulation model of VIENNA rectifier was built and the simulation result reveals that the system can work smoothly in the transition process,with high power factor and low Total Harmonic Distortion(THD)of input current in steady state,which verifies the validity of the proposed control strategy.