Research And Implementation Of Dynamic Reconfiguration Strategy Of Microgrid Based On Multi-agent

Microgrid is a new generation and distribution electric power system with distributed generation as its major power source.It is considered to be one of the most effective ways to utilize distributed renewable energy by reducing the adverse effects of distributed generation on the distribution network and improving the utilization of distributed generation through operational control and energy management to achieve grid-connected or island operations.Due to the randomness and intermittence of renewable energy and the environmental uncertainty,it is important to seek an effective dynamic reconfiguration strategy to ensure the efficient and stable operation of microgrid.With the rapid development of information technology,traditional centralized control has made it difficult to effectively and flexibly control and manage the microgrid.In view of this,this paper applies the distributed multi-agent system(MAS)technology to the dynamic reconfiguration of microgrid energy.The main work of this paper is as follows:(1)Research on microgrid architecture and reconfiguration analysis of microgrid.The microgrid system with wind turbine,solar,diesel engine and storage is established.The functions of scheduling control and reconfiguration decision are realized through energy management system.Mathematical modeling of distributed micro-sources is carried out to analyze its output characteristics.The basic characteristics,excitation conditions and reconfiguration objectives of microgrid reconfiguration are analyzed in detail.The energy loss caused by unnecessary power conversion can be reduced,and the economic benefits of microgrid can be improved.(2)Modeling of microgrid systems based on MAS.Based on the complex theory and the Agent-based modeling method,the agent micro-model of the microgrid system for distributed renewable energy is established.The concept of state transition under reconfiguration is proposed.Focusing on the requirements of reliability,scalability and dynamic adaptability,a reconfigurable microgrid distributed MAS architecture is proposed.Function agents are introduced as mobile agents to aid the optimization and decision-making of the whole system.(3)Implementation of microgrid energy management and dynamic reconfiguration system.This paper introduces the potential game algorithm as the core optimization algorithm for energy management and dynamic reconfiguration of microgrid.Based on JADE platform,the development of microgrid energy management and dynamic reconstruction system is established.The interaction between agents is proposed.The dynamic reconstruction of the microgrid is realized through the interaction and cooperation of the agents.Potential game has excellent distributed characteristics that realize absolute distributed dynamic reconfiguration by combining topology with core optimization algorithm.Finally,simulation verification is carried out by an example of islanded microgrid.Simulation results show that,in base of individual autonomy and intelligence of microgrid,microgrid can realize dynamic reconfiguration.The energy management system can support the plug-and-play of the source,storages and the load.The overall economic,reliability and scalability of the microgrid are fully improved.The simulation results verify the validity of the proposed methods.