Dead-Time Compensation Strategies Based on Kalman Filter Algorithm for PMSM Drives

In this paper, two novel approaches to compensate VSI nonlinearities and dead-time effects are presented. The voltage disturbance observers are based on the Kalman filter algorithm. Their design is focused on suppressing the effect of the quantization noise and other speed measurement inaccuracies on the estimates of the disturbance voltage. In the one case, the rotor velocity is estimated by angle tracking observer and enters to the proposed observer instead of the measured speed. In the latter case, the observer is extended by another state. As a result, the observer is able to estimate the disturbance voltages and rotor velocity. The efficiency of the proposed approaches is verified by experiments on the real vector-controlled PMSM under different operating conditions.