ABSTRACT

This chapter proposes a blended single-phase-shift (SPS)-extended-SPS (ESPS) digital control algorithm for a digital control dual-active bridge-isolated bidirectional DC–DC converter instead of using a traditional SPS-control algorithm, which is commonly used for applications with large input to output voltage variations. This proposed blended SPS-ESPS control algorithm achieved high power conversion efficiency during a large input to output voltage variation, over a traditional phase-shift-control algorithm by reducing the backflow power and the current stress in a circuit. The chapter also proposes a modified digital control dual-active bridge-isolated bidirectional DC–DC converter to be deployed in a stand-alone solar power system coupled with a high-power-density energy storage device. A closed-loop controller is required in power converters for regulating the output voltage/current, and it is also needed to compensate the source/load disturbance. The closed-loop controller is essentially used to minimize or eliminate the error in an output.