A novel bilateral power conversion scheme for variable frequency static power supplies

Abstract

PWM Voltage Source Inverters supplied from diode rectifiers are employed with most of today's static power supplies for variable frequency ac type loads. This method generates non sinusoidal input and output voltage/current waveforms and yields poor system reliability. This paper presents an upgraded method of power conversion that eliminates both problems. In addition it allows bidirectional power flow which improves efficiency and simplifies cooling requirements. The subject method requires a PWM rectifier and a PWM current source inverter. Advanced PWM techniques employed with both static converters allow the minimization of all associated passive components.