基于双闭环PI控制的电流解耦控制系统研究

Research on Current Decoupling Control System Based on Dual Closed Loop PI Control

在同步旋转坐标系中建立了数学模型。采用电压电流双闭环PI控制策略,并将正弦脉宽调制SPWM技术应用在三相VSR控制系统中,实现了基于SPWM的三相电压型PWM整流器的电流解耦控制系统的总体设计。由于将三相基波正弦变量转换成同步旋转坐标系中的直流分量,能够更加直观清晰地观察三相VSR的物理意义。为验证三相VSR PWM整流技术的可行性,对三相电压型PWM整流器进行仿真建模,仿真结果表明三相电压型PWM整流器具有功率因数高、直流电压稳定的优点。

The mathematical model is established in synchronous rotating coordinate system. Using voltage and current double closed-loop PI control strategy,and sinusoidal pulse width modulation（SPWM） technology used in three-phase voltage source rectifier（VSR） control system,the overall design of current decoupling control system based on SPWM three-phase voltage type PWM rectifier is realized. As the three-phase fundamental sine variable into synchronous rotation coordinate system in the DC component,can be more intuitive and clear observation of the physical meaning of three-phase VSR. In order to verify the feasibility of three-phase VSR PWM rectification technology,the simulation software is used to simulate the three-phase voltage type PWM rectifier,the results show that the three-phase VSR has the advantages of high power factor and stable DC voltage.