Modular Multi-Input-Isolated Voltage Multiplier Converter for PV fed DC Microgrid

Abstract

A PV interfaced new Multi-input-port isolated voltage multiplier converter (MIP-IVMC) feeding the DC microgrid is proposed. The ability of the proposed converter to provide high voltage gain utilizing multiplier cells facilitates integration of multiple low voltage PV panels with the 380V DC microgrid. MIP-IVMC incorporates high frequency transformer with the facility of maintaining quasi square voltage in the winding and is capable of reducing the voltage stress on the devices, therefore reducing the conduction loss and improving the efficiency. The input stage of the proposed converter significantly reduces the ripple at the input side by interleaving the current in the inductors. The case of 500W MIP-IVMC feeding the DC microgrid integrating two PV panels in parallel are considered while avoiding the flow of circulating current. The presented results demonstrate fast dynamics and efficient tracking of maximum power under all conditions, even during partial shading conditions. The proposed converter exhibits flexible, robust and reliable operation under all conditions.