Abstract
A low-loss quasi-parallel resonant DC link (L2QPRDCL) circuit with advanced PWM capability is proposed for soft switching a three-phase PWM inverter. This L2QPRDCL has minimum voltage stress for the devices, and an advanced PWM capability due to the variable zero voltage duration of the DC-link over a wide range. Owing to there being scarcely any freewheeling current in the L2QPRDCL during the zero voltage period, low-loss operation in the resonant circuit can be obtained. As a result, the proposed L2QPRDCL inverter is applicable to the highpower range. Operational principles and detailed analyses are presented. By adopting the non-nearest four vectors (N2FV) selection law in the space vector PWM technique, the narrow pulse problem originating from the link operation, which should be considered in those inverters having resonant DC-links, can be eliminated. Experimental results are also presented to verify the link operation and the performance of the selected space vector PWM method.
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