单相PWM整流器高品质网侧电流控制

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...

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

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.