能量回馈式PWM整流器并网的工程设计方法

论述了能量回馈式PWM整流器并网时的同步电流PI控制技术,提出改善馈网电流质量的几种关键的工程设计方法,包括软件滤波、防积分饱和PI控制、简单死区补偿和单位功率因数控制等.基于DSP和CPLD设计了控制系统,实现了上述设计方法,并应用于2.5kW的能量回馈式电子负载.实验结果表明,所提出的工程设计方法有效地改善了馈网的电流质量,使电流波形近似为正弦波且功率因数接近-1.

Engineering Design Techniques of Energy-Fed PWM Rectifier Connected to AC Mains

In order to improve line side current quality of energy-fed PWM rectifier connected to the AC mains, this paper adopts synchronous current PI control technique. Engineering design techniques including software filter, anti-integrated-saturation PI control, simple dead-time compensation and unity power factor(PF)control are described in detail, as well as the relative theory, and key parameters calculation processes. Control system based on DSP and CPLD is designed and used successfully in a 2.5 kilowatt electronic simulation load. The experimental results, which achieve approximately sinusoidal line side current and approximate unity PF, indicate that the described techniques are feasible and useful in engineering design.