Research On Game Optimization Strategy Of Multi-microgrid Cluster For New Power System

The surge in the proportion of new energy has led to a large number of microgrids with unbalanced allocation of source,load and storage resources and insufficient independent operation capacity.In this case,the multi microgrid system needs an energy interaction mechanism that takes into account the interests of all parties to ensure the coordinated operation of the system.Under this mechanism,all microgrids widely carry out equal and mutually beneficial energy transactions to improve their economy and stability;For the power grid,the multi microgrid system is required to improve the self absorption level of distributed energy and reduce the impact of its volatility on the power grid,so as to ensure the friendliness of the power grid.In view of the above situation,this paper first designs a multi microgrid cluster framework structure.Each microgrid in the cluster has a switch array structure and has a unique operation mode parallel mode.The microgrid in this mode can use mains power to supply part of the load while ensuring that the fluctuation of distributed power generation will not affect the power grid,And trade electric energy through internal AC bus.Then,this paper proposes an electric energy trading mechanism in which operators formulate internal electricity price to guide each microgrid in the cluster to carry out demand side dispatching,and designs the determination method of microgrid power consumption and electric energy trading scheme: at the microgrid level,an interior point method based on NSGA-Ⅱ coordination is proposed for optimal dispatching;A multi-objective non cooperative game model is established at the multi microgrid level,and the corresponding iterative solution method of power trading scheme is proposed.When the final scheme is determined,the choice of each microgrid is the Pareto optimal response under the current electricity price.Finally,according to the proposed framework,this paper develops and builds a multi microgrid cluster hardware experimental platform and its supporting host computer software system.Transient experiments show that the platform has good transient response characteristics,can maintain good waveform quality during load increase and decrease,mode conversion and power supply bus switching,and each microgrid can conduct stable power trading;The whole day operation experiment shows that the platform has good steady-state operation ability,and the method proposed in this paper can balance the supply-demand relationship of internal power trading,improve the power interaction level and economy of each microgrid,reduce the dependence of the cluster on the power grid,and improve the overall stability and power grid friendliness of the cluster.