The Overall Capacity Optimization Method of Microgrid Cluster Structure with Distributed Photovoltaic Integrating into Distribution Network

With the continuous advancement of the dual-carbon target, the rapid development of distributed small-capacity photovoltaics takes a challenge to the expansion of distribution network capacity. According to the problem of high penetration of distributed photovoltaic access to distribution network, an overall optimization method of microgrid cluster structure is proposed. According to the planning and operation characteristics of microgrid based on distributed photovoltaic, a microgrid cluster structure analysis model is established. Considering the randomness of photovoltaics, the interaction between microgrids, energy conversion, interaction, and the operation of microgrid clusters, the objective function of microgrid cluster optimization is constructed. A transformer location algorithm based on Voronoi diagram is proposed, which can realize the overall capacity optimization after the microgrid group is integrating into the distribution network. The distributed photovoltaic access distribution network in a certain area was taken as an example, the simulation calculation is carried out. The calculation results show that the microgrid cluster structure can improve the photovoltaic absorption capacity and operation efficiency, optimize the increase of distribution network capacity, and reduce the cost of distribution network planning.