Control and Protection Scheme for DC-link of Solar PV based Microgrid

This paper presents the integrated DC-link voltage control and protection scheme for the DC-link of the microgrid. The proposed integrated scheme is designed to regulate the DC-link voltage during AC side faults or load switching conditions, and protect the DC-link when short-circuit fault occurs at DC-link. To test the proposed scheme, the microgrid test system is designed according to the IEEE 1547 standard in PSCAD/EMTDC software environment. Then the developed microgrid is tested under different fault conditions to verify the effectiveness of the proposed scheme. Results show that the proposed control and protection scheme is able to maintain the DC-link voltage under fault on AC or DC side in grid-connected and islanding modes of operation. The proposed scheme has the ability to ensure the voltage stability and protection of the DC-link of the microgrid under various operating conditions and faults.