交流调速系统脉宽调制方法研究  

Pulse Width Modulation of AC Speed Regulation System

作　　者：康雪峰 王英[1] KANG Xuefeng;WANG Ying(School of Electronics and Information Engineering,Dalian Jiaotong University,Dalian 116021,China)

机构地区：[1]大连交通大学电气信息学院,辽宁大连116021

出　　处：《电机与控制应用》2020年第4期49-53,58,共6页Electric machines & control application

摘　　要：对于交流调速系统中脉宽调制(PWM)过程同时应用空间矢量脉宽调制(SVPWM)和特定谐波消除脉宽调制(SHEPWM),低频时采用SVPWM,中频时采用SHEPWM。这种混合调制方法避免低频时SHEPWM计算存储量较大和中频时SVPWM谐波特性变差等问题。采用一种谐波电流过零点切换方法,实现了SHEPWM中开关角个数由5~1逐步切换过程的平滑过渡;在与SVPWM的切换过程中,采用参考电压矢量同相切换方法,实现了混合调制之间的平滑过渡。仿真结果验证了理论的正确性。Space vector pulse width modulation(SVPWM)and selected harmonic elimination PWM(SHEPWM)are applied simultaneously in the PWM process of AC speed regulation system.SVPWM is adopted at low frequency and SHEPWM is used at medium frequency.This hybrid modulation method avoids the problems of large storage of SHEPWM at low frequency and variation of SVPWM harmonic characteristics at medium frequency.A zero-crossing point switching method is proposed for harmonic current switching,which guarantees the smooth transition of switching angle number from 5 to 1 in SHEPWM technology.In the switching process from SHEPWM to SVPWM,a reference voltage vector in-phase switching method is adopted to achieve smooth transition.Simulation results prove the validity of the theory.

关 键 词：交流调速系统 特定谐波消除脉宽调制 开关角 平滑切换 MATLAB/SIMULINK 

分 类 号：TN787.2[电子电信—电路与系统]