滞后一拍输出方式下逆变器的最少拍控制

Inverter deadbeat control with output pattern of one beat delay

提出了一种逆变器的最少拍控制方案,该方案采用多环控制结构,在设计过程中考虑数字控制的一拍滞后,将其作为被控对象的组成部分来进行最少拍控制器的设计,保证了控制的快速性并获得全部的逆变输出PWM占空比范围。仿真分析显示所提方案在参数稳定的前提下,可以获得理想的最少拍控制性能。分析了最少拍数字控制的系统适应性和参数敏感性问题,在设计允许的被控对象的参数变化情况下,所提出的最少拍控制的系统可以稳定工作。一台2.4 kW逆变样机实验也证明了所提方案的可行性,在阻性负载和整流性负载下都获得了总谐波失真低于3%的输出电压波形。

A scheme of inverter deadbeat control is proposed,which adopts multi-loop structure and considers the one beat delay of digital control output as a part of the controlled object in the controller design to ensure the rapidness of control and achieve the full range of output PWM（Pulse Width Modulation） duty. Simulation shows that the stable. The system adaptability the proposed deadbeat control within the range designed. The Harmonic Distortion） of output of the proposed scheme. ideal performance of deadbeat control and parameter sensitivity of deadbeat can be achieved if the parameters are control are analyzed,which shows that system can operate stably if the parameters of the controlled object vary experimental results of a 2.4 kW inverter prototype show that,the THD（Total voltage is less than 3 % for resistive or rectifier load,verifying the feasibility