H∞ robust control of DC-AC interfaced microsource in microgrids

This paper focus on the DC-AC interfaced microsource system based H∞ robust control strategies. First, it presents detail of a model of DC-AC interfaced microsource which is connected to the power grid through a controllable switch. Then, select the double loop control scheme for the dc-ac interface. In case of the load disturbance and the model uncertainties, the inner voltage and current loop is produced based on the H∞ robust control strategies. The outer power loop uses the droop characteristics controller. Finally, the scheme is simulated using the MATLAB/SIMULINK. The simulation results demonstrate that DC-AC interfaced micro-source system can supply high quality power. Also, it is established that the proposed control scheme can make the system smooth switching between the isolated mode and grid-connected mode.