新型抗饱和PI控制器在PWM整流器中的应用

当PI调节器输出饱和时,就会出现积分饱和现象,从而导致系统性能下降.提出了一种新型的PI调节器,并将其应用到三相PWM整流器电压环中,提高了电压环的控制性能.在这种新型PI调节器中,积分项可以根据PI调节器的输出足否饱和进行单独控制,当出积分饱和现象时,反向计算系数可以削弱这种积分饱和效应.进行了Matlab仿真和实验研究,结果验证了该算法的有效性,从而表明该新型PI调节器能有效降低系统的超调量,缩短系统的稳定时间,同时还可以提高系统对负载扰动的鲁棒性.

New Antiwindup PI Controller for PWM Rectifier

The windup phenomenon appears and results in performances degradation when the proportonal-integral (PI) controller output is saiurated.A novel antiwindup PI controller is presented to improve the control performances of the volt-age loops in the three-phase PWM rectifier.The integral term is separately controlled,corresponding to whether the PI con-troller output is saturated or not.When the windup phenomenon appears,a back-calculation gain is used to reduce the in-tegrator windup effect.Simulative and experimental investigations are carried out.The proposed antiwindup PI controller is verified by the experimental results.It is shown that the novel PI controller can reduce overshoot,shorten the settling time,and improve the robustness to load disturbances.