PWM整流器的无源滑模非线性控制

为提高三相电压型PWM (pulse width modulation)整流器的稳态与动态控制性能,提出了无源滑模非线性控制方案.基于PWM整流器欧拉-拉格朗口系统动力学模型,分析了系统内在无源特性.从全局能量角度出发,利用系统无源性,通过能量成形与阻尼注入方法,给出了PWM整流器的辅助设计系统.设计了滑模变结构电流内环控制器与PI(proportional-integral)电压外环控制器,同时采用基于饱和函数的准滑模控制方法解决了控制力的抖动问题.仿真实验结果表明,所提控制方法可实现三相电压型PWM整流器的单位功率因数控制与直流电压快速调节,同时具有很强的抗电网电压和负载扰动能力以及对于参数摄动的鲁棒性.

Passivity-based Sliding Mode Nonlinear Control of PWM Rectifier

A passivity-based sliding mode nonlinear control method is proposed for three-phase voltage-type PWM(pulse width modulation) rectifier to achieve better steady and dynamic control performances.Based on the Euler-Lagrange dynamics model of PWM rectifier,its inherent passivity property is analyzed.From the viewpoint of the system global energy,passivity-based energy shaping and damping injection approach is employed to obtain auxiliary design system.Consequently,the sliding mode current-inner-loop controller and PI(proportional-integral) voltage-outer-loop controller are designed,and especially a quasi-sliding mode control strategy with saturation function is presented to decrease the chattering of control force.The simulation experiment results show that the proposed control method can achieve unity power factor control and DC(direct current) high-speed voltage high-speed regulation of three-phase voltage-type PWM rectifier,and has good rejection ability for AC(alternating current) voltage and DC load disturbances as well as robustness with respect to the parameter perturbation of PWM rectifier.