A converter-inverter fed induction motor system is widely used for many industrial applications, and a PWM strategy is employed to obtain sinusoidal inputs and outputs. For a railway and a air-conditioner etc., a single-phase PWM converter is often utilized. In the single-phase system, the dc voltage and current are pulsated by the power variation with twice the ac power source frequency. In result, the output waveforms of the inverter are distorted and then a beat phenomenon of an induction motor. The theoretical examinations of this system necessitate complicating the calculations because of the PWM operations of the converter and the inverter.
This paper proposes a model for the single-phase PWM converter and deals with the three-phase PWM inverter-induction motor drive system. The models for the voltage source type and the current source type PWM converters, first of all, are given. Next, the inverter-induction motor system is analyzed by employing the model, and the experimental and the calculated waveforms are shown. Finally, the results at the beat operation of the motor are given. A close agreement between the measured and the theoretical results prove the validity of the proposed models for the PWM converters.
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