Enhanced Two-stage Coordination Control of AC/DC Hybrid Microgrid

In recent times due to the extensive utilization of renewable energy resources, the requirement of grid connection of DC microgrid and AC microgrid becomes very decisive. This paper is proposed an enhanced two-stage coordination control scheme for a bidirectional interlinking converter (BIC) to overcome the problem of efficiency during the interconnection of DC and AC microgrids. The first stage of control scheme is depended upon the P-V/Q-f droop control method, it is used when link-impedance is mainly resistive in nature. The second stage of control scheme is comprised to compensate for the deviation of voltage and current, which are depending upon load under grid connected mode and islanding mode. While changing the load on the AC side under grid connected mode, the operation is transferred to islanding mode. The two-stage control scheme is also utilized for bifurcation of active and reactive power. The proposed control scheme is verified in MATLAB/ Simulink environment.