基于非线性PID控制理论的单相PWM整流器研究

摘要

Based on the voltage loop PI controller of traditional linear control theory,single-phase voltage source PWM rectifier has the characteristics of the poor dynamic performance of system and parameters tuning difficulty in the control of single phase voltage source PWM rectifier.Firstly,the double closed loop of the single-phase voltage source PWM rectifier control is as the basis,which is to analyze the PWM rectifier model of mathematical,and to introduce a new nonlinear function to optimize the control performance of voltage loop,thus,a new type control scheme of single phase nonlinear PI controller is proposed.Finally,the simulation platform is built up by MATLAB software.Compared with the traditional PI controller,the simulation results show that calculation is simple and easy to implement,and the proposed method can not only significantly improve the dynamic performance of the system,but also further enhance the anti-interference ability of the system.%在单相电压型PWM整流器的控制方面,基于传统线性控制理论所设计的电压环PI控制器存在着系统动态性能差、参数整定困难等缺点.文章首先以单相电压型PWM整流器的双环控制为基础,对PWM整流器模型进行数学分析,然后引入新的非线性函数对电压环的控制性能进行优化,进而提出了一种单相PWM整流器的电压环非线性PI控制器控制方案.最后利用MATLAB软件搭建仿真平台,与传统PI控制器的仿真对比表明该方案不仅计算简单易于实现,系统的动态性能好而且还能进一步增强系统的抗干扰能力.