A two-degrees-of-freedom current control scheme for deadtime compensation

A current controller having an inverse dynamic model and a proportional-int egral (PI) controller has been proposed with the aim of compensating the ef fects of deadtime, The proposed control scheme, having two degrees of freed om, can be used for compensating the effects of disturbance without degradi ng tracking performance. To be specific, the disturbance-rejection property is enhanced by increasing the gains of the PI controller, but the PI gain does not affect the transfer function between the current command and its o utput. By nature, it is robust to the parameter mismatch error between the model and the plant, since the mismatch error can be counted as another dis turbance. With the experimental results, we have shown the superiority of t he proposed method in suppressing the current distortion caused by deadtime .