单相PWM整流器高品质网侧电流控制  

AC-side Current Control of Single-phase PWM Rectifier with High Quality

作　　者：杨艳[1] 刘斌[1] 张辑[2] 彭彦卿[2] 

机构地区：[1]淮阴工学院电子与电气工程学院,江苏淮安223003 [2]厦门理工学院电子与电气工程系,福建厦门361024

出　　处：《电测与仪表》2011年第9期61-64,81,共5页Electrical Measurement & Instrumentation

基　　金：福建省自然基金资助项目(2010J01352)

摘　　要：单相PWM整流器网侧电流控制是整流器控制系统的核心,目前常用的PI电流调节器无法实现正弦量的无差跟踪,且需要电网电压前馈以减小电网电压扰动的影响。本文分析了基于PR(Proportional-Resonant)调节器的电流控制系统的动态模型,由于PR调节器的幅频增益在基波处为无穷大,使得该系统能够实现正弦电流的无差跟踪,且不再需要电网电压前馈,简化了控制系统结构;在此基础上,利用根轨迹法对调节器参数进行了理论设计;直流输出电压存在固有的二次谐波,为了减少了网侧电流三次谐波的含量,本文在网侧电流给定条件下进行了动态补偿。仿真和实验结果表明所设计的电流控制系统能够实现网侧电流的高品质控制。AC-side current control of single-phase PWM rectifier is the core component of the control system,but the PI controllers are unable to realize accurate sine-shaped values control.Voltage feed-forward control is also needed to reduce the influence of network voltage disturbance.This paper analyzes the dynamic model of current control system based on PR controllers,which can realize zero steady-state error sine-shaped current tracking because the amplitude-frequency characteristic of PR controllers diverges to infinity at the resonant frequency,no longer needs the voltage feed-forward and the control system is simplified.The root locus method is employed for regulator parameters tuning.There is the inherent second harmonic in the DC-side of single-phase rectifier,in order to reduce the influence on the grid current of the second harmonic,and dynamic compensator is adapted in ac-side current given.The simulation and experiments show that the current control system can realize the high quality control performance of the ac-side current.

关 键 词：单相PWM整流器 电流控制 PR调节器 动态补偿 

分 类 号：TM461[电气工程—电器]