Two-stage Coordinated and Dynamic Economic Dispatch of Multi-microgrid System Considering Hierarchical Structure

[摘要] Multi-microgrid (MMG) system consists of several microgrids (MGs) close to each other in space, and is more resilient to uncertainties and economical in operation than single MG. To coordinate the different goals of MMG system and individual MGs, a hierarchical dispatch structure is firstly established in this paper. Based on this, a two-stage dynamic economic dispatch (DED) scheme is then proposed to achieve the compromise between global and local scope. In Stage I, MMG system's operation cost is minimized to determine the power exchange among MGs, while in Stage II, each MG's purchased power from main grid is optimized to realize local economy. Finally, numerical tests are performed on a triple-MG system and different cases are studied to demonstrate the effectiveness and feasibility of the proposed dispatch strategy.

[发布机构] China Electric Power Research Institute (Nanjing), Nanjing; 210003, China^1;School of Electrical Engineering, Southeast University, Nanjing; 210096, China^2

[效力级别] 电工学

[关键词] Dispatch strategy;Dynamic economic dispatch;Hierarchical structures;Local economy;Micro-grid systems;Numerical tests;Operation cost;Power exchange