Distributed Cooperative Control Of Energy Interconnection Microgrid Based On Multi-agent

In recent years,the disharmony between energy supply and demand and consumption system in China has led to the waste of energy.With the increasingly severe energy and environmental problems,energy interconnection microgrid has received more and more attention as a new direction of energy structure transformation.The primary goal of energy interconnection microgrid operation control is to ensure power quality,and the two important indexes are to maintain the stability of voltage and frequency.The second is to realize the system economy optimization.In the traditional microgrid,the secondary voltage regulation and frequency regulation as well as the economic scheduling algorithm all adopt the centralized control mode.However,the centralized control depends on the communication network of the system.The amount of communication data increases with the increasing permeability of distributed generator,which poses a challenge to the reliability of the system.In view of these problems,the thesis carries out the following research:In order to improve the energy utilization rate and the overall efficiency of the system,an energy interconnection micro grid structure was constructed,the simulation models of various distributed power sources were established and the characteristics were analyzed,and the structure design of the energy router was conducted.Aiming at the reliability problem of centralized control,a distributed architecture of energy interconnection microgrid based on multi-agent was built,and the layered distributed control method was adopted.The bottom layer adopts droop control strategy to realize the power distribution of each distributed generator.In order to solve the voltage and frequency deviation problems in droop control,the second layer control adopts the finite-time consistency algorithm based on multi-agent to adjust the deviation.Aiming at the economic optimization of the system,the third layer control adopts the incremental cost consistency algorithm based on multi-agent,which takes the total generation cost as the objective function,the power balance between supply and demand as the constraint,and the incremental cost of distributed generator as the consistency variable to carry out the economic optimization control.The above layered control strategy was simulated in Matlab/Simulink environment.The simulation results show that the bottom droop control strategy can realize the power redistribution when the load changes based on the output rated power to meet the load requirements,and there are indeed voltage and frequency deviations.The second layer control strategy can eliminate the voltage and frequency deviations of the underlying control in a limited time,so that they can accurately follow their respective reference values and obtain better power quality.Under the condition of satisfying the power balance between supply and demand and the constraints of power generation,the third layer control strategy can make the incremental cost of each distributed generator converge to the same,and obtain the optimal output power value,so as to realize the economic operation of the system.