Dead-Time Voltage Error Correction with Parallel Disturbance Observers for High Performance V/f Control

This paper proposes a dead-time compensation method with a parallel disturbance observer and a current controller in the d-q rotational frame for V/f control. The parallel disturbance observers consist of a fast response disturbance observer and a slow response disturbance observer to separate the back electromotive force (EMF) from the estimated disturbance voltage. As a result, the dead-time error voltage is corrected using the proposed method. The proposed method is validated based on the simulation and experimental results. This method can improve the current distortion to less than 1/9 that of the conventional method.