Microgrid Cluster Division and Optimal Allocation Method Considering Cooperative Increment

In the distribution network with a high proportion of renewable energy penetration, the cooperative operation of multiple microgrids can constitute a microgrid cluster. The capacity optimization of distributed generator (DG) and energy storage system (ESS) of each microgrid in the microgrid cluster is realized, which can improve distribution network economic operation. This paper proposes a microgrid cluster division and optimal allocation method considering cooperative increment: The microgrid planning model considering renewable energy consumption is established, achieving the lowest the lowest annual equivalent cost of each microgrid. Considering the node coupling degree, a regional distribution network cluster partition is presented. Microgrids that are in the same partition and have cooperative increments for joint operation are divided into microgrid clusters. Finally, a two-layer microgrid cluster optimization model is established for joint planning of microgrid cluster. The objective of upper layer model is to optimize capacity allocation of microgrid cluster, and the lower layer is a joint optimization model considering the operation cost of microgrid cluster. The effectiveness and superiority of the proposed microgrid cluster planning method is verified by simulation results of the 42-node system reasonably expanded from IEEE-33 system. The results show that the microgrid cluster planning can achieve better economic operation of distribution network and the nearby consumption of high proportion of renewable energy.