三相VSR的新型电流前馈解耦和滑模控制

A novel decoupling current and sliding mode control of three-phase voltage-source PWM rectifier

三相电压型PWM整流器(voltage source PWM Rectifier——VSR)广泛采用同步旋转d-q坐标系下的电压、电流双闭环控制,且对电流内环的分析一般是建立在系统解耦的基础上。在实际中,由于电感值的变化,系统不能完全解耦,从而导致系统性能变差。针对此问题,提出了一种新型的电压电流双闭环控制,其中电流内环采用同步旋转d-q坐标系下无电感L参数的电流解耦控制方法;电压外环采用滑模控制,并结合SVPWM技术对控制信号进行调制。仿真结果表明,该控制方案具有很好的动态响应性能和鲁棒性能。

The double closed loop control strategy, composed of inner current loop and outer voltage loop in the d-q synchronous frame, is a relatively common control strategy of the three-phase voltage-source PWM rectifier. The analysis of the inner current loop is based on decoupling current controller. In fact, because of the variety of the input inductor, the system is not decoupled completely, and its performance becomes poor. To solve this problem, a novel double closed loop control strategy was proposed, which consisted of decoupling current controller without exact value of the boost inductance in d-q synchronous frame with outer voltage control loop using sliding control method. The control signals were modulated by SVPWM technology. The simulation analyses demonstrate that the proposed method possesses good dynamic response and good robustness.