A Novel Grid Connected Dc-Dc Converter

[摘要] This paper proposes a three-port grid based dc-to-dc power conversion circuit for low range distributed systems. With this converter, the load can be powered from two different dc sources, which can be a combination of two from a solar-cell panel, a fuel-cell set, a battery bank, etc. and grid source,. The power conversion circuit consists of two active power switches by commonly using an inductor and an output filter capacitor and also the gate pulses of ac inverter circuit. By adjusting the duty-ratio of the active power switch and gate pulses, the voltage regulation at the output as well as the power coordination between two input sources can be made. An experimental circuit has been built and tested to verify the analyzed and simulated results.

[关键词] DC-DC converter;Continuous Conduction Mode;Discontinuous Conduction Mode;Grid system