Abstract
Multiple microgrids (MMGs) are clusters of interconnected microgrids that have great potential for integrating a large number of distributed renewable energies (DREs). The grid-connected control scheme is important for the exploration of the MMGs’ operation potential. In this paper, a multi-layer coordinated control scheme for DC interconnected MMGs is proposed to optimize their operation and improve their operation friendliness. An adaptive droop control method is designed for the DC connection interfaces of the MMGs to adaptively manage the power exchange among the sub-microgrids. Meanwhile, the strategy of power fluctuation suppression is developed for the hybrid energy storage system (HESS) in the MMGs. The coordination among the sub-microgrids and the HESS is then clarified by the proposed control scheme to optimize the AC tie-line power and make the MMGs a highly coordinated collective. A case study is performed in PSCAD/EMTDC based on the demonstration project in Guangxi, China. The results show that the proposed multi-layer coordinated control scheme realizes the coordinated operation of the MMGs, fully exploits the complementarity of the MMGs, and improves the operation friendliness among the sub-microgrids and the utility grid. Thus the integration and utilization of a large number of DREs is enhanced.
Highlights
The integration of distributed renewable energies (DREs) into power systems has been increasing rapidly in recent years [1,2]
The above analysis is based on the assumption that the hybrid energy storage system (HESS) has enough capacity configuration to release or absorb any amount of energy that is assigned by the multi-layer coordinated control scheme
The simulation model of a grid-connected multiple microgrids (MMGs) is built in PSCAD/EMTDC
Summary
The integration of distributed renewable energies (DREs) into power systems has been increasing rapidly in recent years [1,2]. It is necessary to investigate the control schemes for MMGs to fully explore their complementarity, their potential of optimized operation, and make them coordinated and friendly systems both to the utility grid and the sub-microgrids. The hybrid-connection-interface-based MMGs introduced in [13] is studied in this paper and a multi-layer coordinated control scheme for its grid-connected operation is proposed . The multi-layer coordinated control scheme is designed to adequately exploit the complementarity and coordination of the MMGs, as well as improve its operation friendliness so as to eventually promote the integration and utilization of a large number of DREs. An adaptive droop control method is designed for the DC connection interfaces of the MMGs to properly share power among the sub-microgrids and improve the sub-microgrids’ coordination.
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