Research On Coordinated Control Method For AC/DC Hybrid Microgrid Based On Multi-Agent

The AC/DC hybrid microgrid integrates new energy distributed power generations technology,AC/DC hybrid power distribution technology,etc..With various topologies and flexible operation modes,it can effectively access various forms of distributed generations,and provide efficient generations for various forms of AC or DC loads.It can effectively solve the problems of local access and absorption of high density distributed generations.In addition,the uncertainties of high distributed energy,flexible and diverse operation modes,a large number of distributed generations and power electronic converter equipment have posed many challenges to the coordinated control of AC/DC hybrid microgrid.Especially with the access of high-density distributed generation,the communication has increased steeply,and the communication network of the system is overwhelmed.To solve the above problems,this paper focuses on the coordinated control of AC/DC hybrid microgrid based on the multi-agent.Firstly,this paper introduces the research background and significance of this paper,summarizes the development trend of microgrid and the research status of microgrid technology;secondly,it summarizes the typical structure and operation mechanism of AC/DC hybrid microgrid,and analyses the advantages and disadvantages of three different modes of master-slave control,peer-to-peer control and hierarchical control;and it also analyses the basic theory of multi-agent and its consistency problem.Aiming at the characteristics of multi-agent autonomy,collaboration and distribution,multi-agent theory is applied into the coordinated control of AC/DC hybrid microgrid.Then,combined with the typical topology of AC/DC power interface in AC/DC hybrid microgrid,a hierarchical coordinated control strategy of multi-parallel bi-directional converters in AC/DC hybrid microgrid based on multi-agent is proposed and it implementes the reasonable power distribution of AC/DC power interface in AC/DC hybrid microgrid and the stability of DC bus voltage.Then the operation mechanism and coordinated control method of AC/DC hybrid microgrid are studied.A hierarchical coordinated control strategy of AC/DC hybrid microgrid based on regional multi-agent is proposed.The proposed control strategy realizes the reasonable distribution of power and secondary coordinated control of bus voltage.Meanwhile it enhances the controllability of microgrid system.Finally,combined with the AC/DC hybrid microgrid demonstration project,a simulation model was built,and the correctness and feasibility of the proposed control strategy was verified.