An integrated AC drive system using a controlled-current PWM rectifier/inverter link

Two identical 3-phase, bipolar transistor, controlled-current, PWM power modulators are integrated so that one functions as a rectifier and the other as an inverter in an ac drive system. The rectifier input currents maintain near 60 Hz sinusoidal waveforms with unity power factor. Leading power factor option is available. The modulators do not depend on the availability of bidirectional switch elements. Performance as a polyphase induction motor drive under motoring and regenerative braking is reported. The study includes digital simulation of operation as a synchronous motor drive.