A Minimum Phase Dual Output Hybrid Converter for Off-Grid Applications

Abstract

A minimum phase dual output hybrid converter for DC microgrid applications is proposed in this paper, which is capable of supplying power to AC and DC loads simultaneously. The circuit configuration of the proposed converter eliminates the right half plane zero (RHPZ) from the DC control-to-output transfer function, making the system minimum phase. Due to the minimum phase behavior, the proposed converter is capable of meeting high load current requirement while maintaining closed-loop stability. Further, the minimum phase behavior of the proposed converter also facilitates simpler controller design and faster dynamic response. The proposed converter can be applied to perform dc/ac and dc/dc power conversions for renewable energy sources. A hybrid PWM switching scheme is developed to realize the same. Detailed mathematical modeling is carried out to demonstrate the properties of the proposed converter. A 645 W laboratory prototype is developed to validate the proposed topology experimentally.