Research On Optimal Dispatch Of Multi-Energy Complementary Microgrid Based On Combined Cooling,Heating And Power

With the increasingly serious problems of energy shortage and ecological destruction,it is extremely urgent to carry out the research on renewable energy.As a comprehensive energy utilization system,the cold,heat and power supply system has gradually become the current research hotspot.The cold,heat and power coupled micro-grid consists of a variety of distributed generation equipment,which can meet the needs of cold,heat and electricity of the user side through the step utilization of energy.Due to a large number of equipment types in the system,complex energy coupling and high proportion of renewable energy,the optimization scheduling problem contains dynamic stochastic and nonlinear characteristics,and the solution is relatively complex,so it is not easy to give full play to its advantages.In this thesis,the cold,heat and electricity combined micro-grid is taken as the research object,and the optimal scheduling method is proposed for the research object,which effectively improves the economic benefit and comprehensive energy utilization rate of the system.The main research contents of this paper are as follows:(1)A micro-grid architecture containing the cold,hot and power supply system is constructed,and the equipment operation strategy and energy flow mode in the system are described.Mathematical modeling is carried out for the main equipment in the system,and mathematical equations are used to describe the operation constraints and input and output power of the equipment.(2)in view of the traditional cold hot electric installations,system scheduling strategy of high running cost and equipment capacity redundancy problem,economy system as the optimization goal,set up the cold and hot electric installations,micro network optimization model for a few days ago,the optimal scheduling strategy,put forward a kind of economic and the traditional butterfly algorithm was improved,the effectiveness of the algorithm is validated by computer simulation.(3)To solve the problem of low comprehensive energy utilization rate in the cold,heat and power supply system,the air-conditioning load was taken as a virtual energy storage device and a model was established by considering the thermal comfort of human body and the inertial factors of cold and heat energy.In view of the difficulty in determining the weight in traditional multi-objective optimization,the membership function in fuzzy mathematics theory is used to analyze the multi-objective,and the improved butterfly algorithm is used to calculate the multi-objective.The effectiveness and economy of the proposed air conditioning virtual energy storage characteristics are verified by a simulation example.(4)Aiming at the problem of insufficient information interaction among micro-grid groups at present,a cooperative alliance game model for micro-grid groups of cold,heat and power supply is established.Shapley value is used to distribute the surplus value generated by cooperation.In view of the problems of insufficient energy utilization and equipment redundancy in the operation of each independent micro grid group,it is divided into supply/sale energy micro grid,and the operator can set the transaction price according to its own operation situation.Finally,the optimization is carried out with the aim of minimizing the operation cost of the alliance,and the effectiveness of the game model is verified by the simulation of an example.