三相电压型PWM整流器最优H_∞鲁棒控制研究

Research on Optimal H_∞ Robust Control of the Three-phase PWM Rectifier

基于现有三相电压型PWM整流器双环PI控制的不足,采用非线性控制理论,对电流内环进行改进,提出了一种反馈线性化最优H_∞鲁棒控制策略。首先对三相电压型PWM整流器的dq模型进行分析,选取状态变量、输出变量,建立仿射非线性系统模型,然后对模型进行状态反馈精确线性化,得到解耦的精确线性化系统,通过解Riccati不等式,最终得到最优控制规律。仿真结果表明:该控制方法能使系统在固定范围内强干扰和参数摄动的状态下实现功率因数整流,并且保持稳定的输出直流电压,可以为战场条件下移动电站应急供电提供有效技术支持。

Based on the disadvantages of existing classical three-phase PWM rectifier double-loop PI control strategies including current inner loop and voltage outer loop, made the improvement of current inner loop, and proposed the optimal H~ robust control based on exact feedback linearization. By analysing the dq model of three-phase PWM rectifier, the affine nonlinear model was built on the selected state variables and output variables.Then realized decoupled control of three phase PWM rectifier through the state feedback exact linearization, and obtained the optimal control law by the solution of Riccati inequality. The simulation results show that the proposed control method can achieve the DC output voltage to be stable and unity power factor control in a fixed range of strong disturbance and parameter perturbation. It can provide effective technical support for the emergency power supply of mobile power station.