Development of Control Strategies for Operation of Cluster of Interconnected Hybrid Microgrids in Islanded Mode

Abstract

This article presents the architecture and control techniques for interconnections of islanded hybrid smart microgrids (MGs, both dc and ac), for transferring the bidirectional power between different MGs. Three ring-type MGs, i.e., one ac microgrid (acMG) and two dc microgrids (dcMGs) operating at different voltages are interconnected to form a power park. A bidirectional dc–dc converter has been used to interconnect two dcMGs, and bidirectional three-phase voltage source converter (VSC) is used to interconnect the dcMG and acMG. The control techniques of these bidirectional VSCs are also proposed to control the operation of interconnected MGs system. The feedforward and feedback control signals are suggested in the proposed control techniques. The objectives of the proposed control techniques are to control the bidirectional power flow between the interconnected MGs, and to establish the constant rated voltages of all MGs, under islanded mode, for various operating scenarios. To check the effectiveness and robustness of the developed interconnected MGs system and proposed control techniques, the simulations have been carried out for the different operating conditions, in the real-time digital simulator environment.