The output optimization of multi-microgrids connected to distribution network during peak, flat and valley periods

摘要

Due to the uncertainties of new energy generation and load, and the increased penetration of new energy, the impact of these uncertain factors on microgrid will increase. In this paper, a coordinated economic operation approach for output optimization of multi-microgrids connected to distribution network is proposed. In the proposed approach, the different coordination dispatching strategies are proposed during peak period, flat period and valley period of a day with different power supply and demand. The economic output optimization model, in which the interactive coordination of multi-microgrid is taken into account, is established. The method is to make full use of complementarities among different microgrids or among different microgrid sources, and remove the uncertainties of intermittent microgrid source's output. Case study shows that the proposed operation approach not only can decrease the dependence on energy storage device, but also reduce the operation cost of microgrid.