SOFT-SWITCHING SPACE VECTOR PWM INVERTER USING A NEW QUASI-PARALLEL RESONANT DC LINK

A soft switching quasi-parallel resonant dc-link (QPRDCL) inverter wit h improved PWM capability has been recently presented [5]. The circuit has the minimum voltage stress of the devices and provides the flexib ility of selecting the on/off instants of the resonant link, resulting in improved PWM capability. In this paper, the operational principles and the detailed analysis of the QPRDCL inverter are presented for th e resonant components design and the inverter control. An SVPWM with o ptimal vector sequence suitable for the QPRDCL inverter is also presen ted through the comparisons among five different modified space vector PWM (SVPWM) techniques classified by the voltage vector sequences. Th e performance of the selected optimal SVPWM is verified by the experim ental results.