| The sustainable development of human society is inseparable from the rational use of energy.The microgrid can effectively utilize various types of distributed renewable energy.It can be connected to an external large grid for grid-connected operation to improve the reliability and power supply efficiency of the power supply system,or it can be operated independently from the grid to form a small power system,to supply power for the local load.The AC/DC hybrid microgrid combines the advantages of the AC microgrid and the DC microgrid,fully considers the characteristics of different loads,avoids unnecessary energy conversion,and improves use efficiency.This article focuses on the AC/DC hybrid microgrid,combined with the future development trend,introduces electric vehicles,a special load that can consume and provide electricity,and proposes an AC/DC hybrid based on Smart Interlinking Unit(SIU)Microgrid architecture and its hierarchical control strategy.The main work of this paper is as follows:(1)Introduced the typical microgrid architecture,including AC microgrid,DC microgrid and AC/DC hybrid microgrid,and then analyzed their respective advantages and disadvantages;then introduced the two levels of electronic components and system architecture Control strategy of hybrid microgrid.(2)Aiming at the structure of the hybrid microgrid,a new interconnection converter topology named SIU is proposed,which can be used to connect the AC subnet and the DC subnet.It is not only compact in structure,but also includes a dedicated interface for electric vehicle charging piles.On this basis,a new SIU-based AC/DC hybrid microgrid architecture is also proposed.(3)The corresponding hierarchical control strategy is proposed for the new type of AC/DC hybrid microgrid,and the local control of the first layer and the energy flow control strategy of the second layer are introduced in detail.According to the different operating modes and state of charge,it is divided into 4 kinds of local control strategies and 17 kinds of energy flow control strategies.(4)For the proposed micro-grid architecture,the system simulation experiment platform was built and analyzed in MATLAB/Simulink.Through the analysis of a variety of typical cases in the grid-connected mode and the off-grid mode,the feasibility of the architecture and the effectiveness of the strategy are verified,and it is proved that the architecture can operate stably in different states and complete the strategy consistent with the expected strategy.The energy flow realizes the optimal configuration of energy. |
