Control Techniques for Interconnections of Cluster of Neighboring Islanded Hybrid Smart Microgrids

Abstract

This paper presents an architecture for interconnections of cluster of neighboring islanded mix smart microgrids (both DC and AC), for sharing the power among various areas. The cluster of microgrids consists of three microgrids i.e. two DC microgrids operating at different voltages and one AC microgrid. All microgrids have ring type architectures, which consist of various renewable distributed generations, battery energy storage systems, and various AC and DC loads. Two DC microgrids are interconnected through the bidirectional DC–DC converter, and the DC microgrid and AC microgrid are interconnected through the bidirectional single-phase voltage source converter (VSC). In this work, the control techniques of the bidirectional VSCs, used for interconnections of three microgrids, have also been developed, for controlling the operation of the interconnected microgrids system. The developed control techniques use the feed-back and feed-forward control signals. The developed control techniques are aimed to manage the bidirectional power flow between the interconnected microgrids, and to maintain constant desired rated voltages of all microgrids, under islanded mode, for different operating conditions. To verify the robustness of the proposed interconnected microgrids system and developed control techniques, the simulations are carried out under various operating scenarios, in the MATLAB environment.