三相电流型PWM整流器在断续导通模式下的研究  

Research on Three-Phase Current Source PWM Rectifier in Discontinuous Conduction Mode

作　　者：刘一瑾 杨奕 郭强 LIU Yijin;YANG Yi;GUO Qiang(College of Electrical and Electronic Engineering,Chongqing University of Technology,Chongqing 400054,China;Chongqing Energy Internet Engineering Technology Research Center,Chongqing University of Technology,Chongqing 400054,China)

机构地区：[1]重庆理工大学电气与电子工程学院,重庆400054 [2]重庆市能源互联网工程技术研究中心,重庆400054

出　　处：《重庆理工大学学报（自然科学）》2021年第11期189-197,共9页Journal of Chongqing University of Technology：Natural Science

基　　金：重庆市教委科学技术研究计划项目(KJQN202001128);重庆市技术创新与应用发展专项资助项目(cstc2019jscx-msxmX0003)。

摘　　要：在轻载条件下,三相电流型PWM整流器常出现网侧电流畸变严重、输出电压失控的问题,针对这种情况,提出一种多目标PWM方法。首先,介绍了传统的PWM方法,并给出在不同负载条件下系统使用传统PWM方法时,输入电流和直流侧电流的仿真波形。然后,针对调制模式下的Buck-Buck电压模式,根据不对称和对称DCM两种情况下的直流侧纹波电流,通过等面积法、伏秒平衡及其电感的电压电流关系式,推导出多目标PWM占空比表达式,并给出多目标PWM方法的开环控制结构。最后,仿真结果验证了所提方法的可行性和正确性。Under the condition of light load,the grid-side current distortion and output voltage out of control of three-phase current PWM rectifier often occur,because the discontinuous current at the dc-link leads the system to run in the discontinuous conducting operation mode.To solve the above problems,a multiobjective PWM method is proposed in this paper.Firstly,the traditional PWM method is introduced,and the simulation waveform of input current and dc-link current is given when the system uses the traditional PWM method under different load conditions.Then,for the Buck-Buck voltage mode with modulation mode,according to the ripple current of asymmetric DCM and symmetric DCM,the duty cycle expression of multiobjective PWM is derived by using the equal-area method,voltage-current equation of volt-second balance and inductance,and the open-loop control structure of multiobjective PWM method is given.Finally,the simulation results verify the feasibility and correctness of the proposed method.

关 键 词：电流型PWM整流器 电流畸变 电压失控 断续导通模式 占空比 

分 类 号：TN35[电子电信—物理电子学]