三相电压型PWM整流器的反馈线性化和滑模控制

建立了同步旋转坐标系下的三相电压型脉宽调制(PWM)整流器(VSR)的非线性数学模型,针对有功电流和无功电流强耦合的特点,提出一种基于该坐标系的电压和电流双闭环控制算法,其中电压外环采用滑模控制算法,电流内环采用状态反馈精确线性化控制策略,最后建立了仿真模型并与传统PI控制进行了仿真对比.结果表明,该复合控制方案结合了两者的优点,使VSR既具有良好的鲁棒性,又能实现无功电流和有功电流的解耦控制,系统能保证很高的功率因数,输出电压恒定,能适应负载的扰动和非线性变化,具有很好的静动态性能.

Feedback Linearization and Sliding-Mode Control of Three-Phase Voltage Source PWM Rectifier

In this paper, first, a nonlinear mathematical model of three-phase voltage source rectifier (VSR) with pulse-width modulation (PWM) is established in the synchronous rotating reference frame. Next, by considering the high coupling of active and reactive currents, a double closed-loop control algorithm of voltage and current is proposed, in which a sliding-mode control algorithm for the outer voltage loop and an exact feedback linearization method for the inner current loop are adopted. The whole system is then simulated, and the results are finally compared with those obtained by the traditional PI control. It is found that the proposed scheme integrates the advantages of sliding-mode control and feedback linearization method, which makes VSR to be robust and realizes decoupling control of active and reactive currents, and that, with the proposed scheme, the system is of high power factor, constant output voltage, good static and dynamic performance, and robustness to the disturbance and nonlinear variation of the load.