基于扰动观测器的电压源型逆变器负载电流前馈控制及参数设计方法

A Disturbance-Observer-Based Load Current Feedforward Control and Parameter Design Method for Voltage-Sourced Inverter

为解决采用传统电压电流双环控制的电压源型逆变器在负载投切时输出电压波动的问题,提出一种基于扰动观测器的负载电流前馈控制方法。将负载电流视为系统扰动,经扰动观测器观测后前馈至电压外环补偿器的输出端,从而抑制负载电流对输出电压的影响。在不需要增设额外电流传感器、信号传输与处理电路的情况下实现对负载电流的快速跟踪,进而提升系统的动态性能以及减小逆变器输出电压的稳态误差。基于控制系统快速响应能力和稳定性的要求,给出具备普适性和可移植性的控制参数设计方法。分析表明,与传统双环控制相比,该文提出的负载电流前馈控制方法对参数摄动的灵敏度更低,系统的鲁棒性更强。仿真和实验验证了所提控制策略及参数设计方法的可行性和有效性。

To solve the output voltage fluctuation caused by load switching for voltage-sourced inverter with traditional voltage and current dual loop control,a disturbance-observer-based load current feedforward control method is proposed.This method regards the load current as a system disturbance,and feeds forward it to the output of the compensator in voltage loop after it is measured by disturbance observer,thereby the influence of the load current on the output voltage is suppressed.Without adding additional current sensors,signal transmission or processing circuits,fast tracking of the load current is realized,the dynamic performance of the system is thus improved and the steady-state error of output voltage is reduced.Based on the requirements of rapid response capability and stability of the control system,a parameter design method with universality and portability is given.The analysis shows that compared with the traditional dual loop control,the disturbance-observer-based load current feedforward control method proposed in this paper is less sensitive to parameter perturbation and the system is more robust.Simulations and experiments verify the feasibility and effectiveness of the proposed control strategy and the parameter design method.