Research On Distributed Coordinated Control Method Of Microgrid Based On Multi-agent-system

The efficient use of new energy sources has always been the focus of research in various countries,and the disadvantages of new energy sources such as decentralization and intermittency make them unable to generate electricity centrally like thermal power generation.The concept of microgrid is proposed to optimize a series of problems arising when distributed power sources are connected to the grid.In order to ensure the stable and efficient operation of microgrid,it is necessary to control the microgrid stably.Previously,only one of the distributed generators（DG）or energy storage facilities（ESS）was targeted in microgrid control,but since the microgrid in actual engineering contains both DG and ESS,this thesis designs an integrated controller for power generation and storage that can control the frequency and power of the system and additionally control the So C equalization of ESS;meanwhile,the communication in the microgrid system may have packet loss and delay,these problems will give affect the stability of the whole system,so this thesis designs a new event triggering mechanism to reduce the data communication volume.The application of microgrid hierarchical control theory is based on the stable operation of the primary control and three-phase inverter at the bottom,so this thesis adopts a bottom-up research route.The paper starts with a theoretical analysis of a microgrid system using only primary control,explains the causes of frequency errors,and builds a simulation model in MATLAB based on primary control and three-phase inverter control for verification.Next,the paper introduces the secondary control in hierarchical control theory to correct the frequency and power errors of the primary control,and introduces the multi-intelligence system and event triggering mechanism to reduce the data volume of the communication network and the number of actuator executions for the purpose of control system optimization,and builds a simulation model for verification.Finally,this thesis proposes the design method of the dynamic event-triggered integrated islanded microgrid secondary controller for power generation and energy storage,which can integrate power generation and energy storage under the unified control,which is more consistent with the actual engineering scenarios and easier to deploy the microgrid.The introduction of dynamic event triggering mechanism also further optimizes the performance of the controller and reduces the number of event triggers,and a simulation model is established to verify the results,which show that the algorithm proposed in this thesis has certain advantages compared with the traditional algorithm.