Research on the Operation Strategy of Distributed Micro-grid Based on Power Electronic Transformer

Abstract

DC microgrid has more advantages than AC microgrid, and it will become the main means of renewable energy in a centralized grid connection. The structure characteristics and operation modes of an active distribution network (ADN) and connected distributed DC microgrid are fully considered in a multipoint distributed distribution system. Thus, this study uses the power electronic transformer (PET) to realize the peer-to-peer control of a DC microgrid, which reduces the complexity of the entire control system. Five operation modes of the DC microgrid are also designed, and real-time power flow optimization of the distribution network is conducted by using PET. The aim is to minimize the total operating cost of the ADN with the DC microgrid. The optimal operation strategy is realized through distribution network control and multi DC microgrid cooperative optimization operation. The example simulation shows that the method proposed in this paper can reflect the advantages of PET and DC microgrid in absorbing distributed energy, cutting the peak, filling the valley, and realizing the power flow optimization of the distribution network.