A Novel Three Phase Induction Motor Drive for Ceiling Fan Application with Improved Dc-link Utilization

A novel three phase induction motor drive for domestic ceiling fan application is proposed in this paper with improved dc-bus utilization. The proposed system is fed from a 50Hz single phase ac power source using a flyback-based power factor correction rectifier circuit, which results in 100Hz voltage ripple in the dc-link. The voltage ripple is considerable (nearly 10%) as a low value of capacitor is used to avoid high system cost. By using special carrier based space vector modulation (SVM) strategy the motor performance can be made immune to this voltage ripple but it limits the dc-bus utilization considerably. In this paper this problem is addressed by introducing an appropriate phase difference between the reference vector of the SVM and the dc-link voltage ripple. This phase difference is calculated by aligning the peaks of the modulation signal and the dc-link voltage ripple. It is shown that by doing so the dc-bus utilization can be increased. In the proposed case the dc-bus utilization is achieved to be 61% whereas any existing PWM strategy with ripple free dc-link voltage cannot have more than 57.7% dcbus utilization. Simulation studies are carried out in PLECS to support the theoretical claims. The experimental validation would be included in the final paper.