A Control Strategy for Hybrid Islanded Microgrid

Hybrid ac/dc microgrids have been developed to overcome the drawbacks of either ac or dc microgrid. To profit of the remarkable aspects of ac as well as dc, an inter-linking converter (ILC) is required to transfer the power between the two sides of the microgrids, meanwhile maintain the ac sub-grid frequency as well as the dc sub-grid voltage within acceptable ranges. This paper presents a strategy to control the power flow between the two sub-grids. The paper proposes an autonomous control for the ILC to eliminate the need for any communication layer between the distributed generators and the converter. Multiple operating modes have been simulated using PSCAD/ EMTDC software environment to ensure the validity of the suggested control strategy.