Resilient control of DC microgrid integrated with multi-nanogrids considering connected-islanded states
CSEE Journal of Power and Energy Systems(2023)
摘要
In this paper, a DC microgrid (DCMG) integrated with a set of nano-grids (NG) is studied. The DCMG exchanges predetermined active and reactive powers with the upstream network. The DCMG and NGs are coordinately controlled and managed in such a way that the exchanged P-Q powers with the external grid are kept on the scheduled level following all events and operating conditions. The proposed control system, in addition to the ability of mutual support between DCMG and NGs, makes NGs support each other in critical situations. On the other hand, in all operating conditions, DCMG not only feeds three-phase loads with time-varying active and reactive powers on the grid side but also injects constant active power into the grid. During events, the NGs support each other, NGs support DCMG, and DCMG supports NGs. Such control strategies are realized by the proposed control method to increase the resilience of the system. For these purposes, all resources and loads in DCMG and NGs are equipped with individual controllers. Then, a central control unit analyzes, monitors, and regularizes the performance of individual controllers in DCMG and NGs. Nonlinear simulations show that the proposed model can effectively control the DCMG and NGs under normal and critical conditions.
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关键词
DC Microgrid,Nanogrid,Control System,Resilience
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