Design and analysis of closed loop control of power-converters for forming droop-controlled AC–DC subgrids of an islanded hybrid AC–DC microgrid

摘要

Hybrid AC–DC microgrid (HMG) is formed byconnecting separate AC and DC microgrids with an interlinkingconverter (IC). In islanded mode of operation of theHMG its AC and DC subgrids are droop controlled to achievepower-sharing. The power flow between the subgridshappens through the IC, which regulates the amount ofpower being transferred based on the values of the frequencyof AC bus voltage and the voltage at the DC bus.This paper presents the utilization of power-electronicconverters to form the droop-controlled AC–DC subgrids ofan islanded HMG which will be beneficial for furtherstudies of IC and HMG. The detailed design and analysis ofthe closed-loop control system parameters of both the powerconverters is presented. The results obtained fromsimulations carried out in MATLAB/Simulink, and the realtimesimulation results obtained by implementation usingOPAL-RT OP4500 real-time digital simulator hardware arepresented for the verification.