【摘要】 针对PWM整流器模型预测控制稳态波纹大、采样频率高、开关频率不固定等问题,结合滑模控制,研究了一种改进的模型预测控制方法。外环采用一种新型的电压平方的滑模控制来代替PI控制,具有较好的鲁棒性和动态性能,对于负载突变也能表现出较好的抗扰动性。内环采用一种定频的模型预测控制方法,并通过两步预测对系统进行延时补偿,减小了系统的稳态误差和功率纹波。仿真结果表明,相对于传统的模型预测控制,改进后的方法能够显著地减小功率脉动,增强系统的动态性能和稳态特性,是一种较好的功率控制方法。更多还原

【Abstract】 In order to solve the problems of high steady-state ripple, high sampling frequency and uncertain switching frequency for the PWM rectifier with model predictive control,an improved control method combining the sliding mode control with model predictive control was proposed. In outer loop,a new control strategy with outer voltage square loop based on the sliding mode control was used to replace PI control. The method not only has good robustness and dynamic performance,but also show good anti-disturbance when load resistance changed. In inter loop, model predictive control method with fixed switching frequency was used, and delay compensation by two-step prediction was realized,which can reduce the steady-state error and the power ripple for system. Simulation results showed that, compared with traditional model predictive control,the new method can significantly reduce power pulse, enhance the dynamic performance and steady-state performance, it is a good method for power control.更多还原