Multi-Time Scale Energy Management and Optimal Dispatch Scheme for Islanded DC Microgrid Operation

Abstract

DC microgrid has outstanding advantages in accepting new energy generation system and DC load, etc. This paper takes theislandedDC microgrid as the research object, and proposes a multi-time scale optimization scheduling scheme for theislandedDC microgrid. On the basis of satisfying the power balance of the DC bus and considering the factors of economy and environmental protection, this scheme realizes the optimized operation of the DC micro-grid under the isolated island mode. The optimization scheme consists of two stages: day-ahead scheduling and intraday scheduling. According to the short-term forecast data in advance, the day-ahead dispatching takes economic and environmental protection as the target todispatch controllable unit. In this paper, intraday scheduling maintains the power of the battery energy storage and interruptible loads determined by day-ahead scheduling. Taking ultra-short-term prediction data as the premise, intraday scheduling takes the minimum deviation between the output power of controllable power supply and the corresponding value of day-ahead scheduling as the target to formulate scheduling scheme. Finally, an example is given to verify the feasibility of the optimized scheduling scheme by simulating the proposed program on MATLAB.