Abstract
This paper presents the reactive power flow and its influence on the wide-frequency operation of sinusoidal filter-equipped induction motor (SFE-IM) drives. A sinusoidal filter, placed at the output of a voltage source inverter (VSI) to filter the pulse width modulated (PWM) voltages, unfolds a research opportunity in SFE-IM drives, as the filter capacitors also supply reactive power to the IM. The paper comprehensively investigates this reactive power flow in an SFE-IM system with filter capacitor values designed using two different methods. In continuation, with the designed capacitors, the paper analyzes issues in the wide-frequency operation, such as reactive power imbalance, abnormal escalation in inverter currents, variation in power factor seen by the VSI, and high current stress on DC-bus capacitors and VSI. Furthermore, the analysis formulates the method of filter capacitor selection for the wide-frequency operation of the SFE-IM system in terms of IM and LC filter parameters while resolving the issues mentioned above. The proposed analysis is simulated in MATLAB/Simulink and experimentally validated on a 5 hp IM drive.
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