Flexible Interlinking and Coordinated Power Control of Multiple DC Microgrids Clusters

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Abstract
Multiple distributed dc micorgrids (MGs) in a close vicinity can be connected to each other to form a dc MG cluster (especially with isolated bi-directional dc-dc converters (IBDCs) as the active interconnected devices). A novel coordinated power control framework for such a cluster has been proposed, in which the dc MGs adopt the standard droop control, and a unified control is proposed for the IBDCs. In normal operation, autonomous flexible interlinking power control among the dc MGs can be achieved through the unified control of the IBDCs, making the demand of the power terminals to be proportionally shared among the slack terminals in the cluster. Furthermore, with the unified control, the interlinked IBDCs can transfer to dc MG support control mode automatically without control scheme switching and operation mode detection under emergency situations. In addition, when there is a dc bus fault in one of the subsystems, the interconnected IBDC can lockout its control signals and isolate the dc fault, to ensure stable operation of the rest of the dc MGs within the cluster. Finally, PSCAD/EMTDC based simulation verifications and experimental results obtained from a hardware prototype have been provided.
Funding Information
  • National Key Research and Development Program “Simulation and Test of Combining, Boosting and Accessing System and Equipment for HVDC-Connected Photovoltaic Station” (2016YFB0900204)
  • National Nature Science Foundation (51507109)
  • 2016 Science and Technology Project of China Southern Power Grid (CSGTRC-K163001)
  • Guangdong Key Laboratory of Clean Energy Technology (2008A060301002)
  • Future Energy System Research under Canada First Research Excellent Fund

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