| Traditional energy systems are mostly planned and operated independently,the coupling effect among various energy sources is often ignored,therefore the concept of Integrated Energy System(IES)emerges as the time requires.It can realize the comprehensive utilization of electricity,natural gas,heat and other energy sources because of its multi-energy coupling characteristics,so as to maximize the comprehensive utilization efficiency of energy,which is of practical significance for ensuring the economical,efficient and environmentally friendly supply of energy.As the important unit,the energy hub enriches the supply channels of energy and improves the reliability of the system.Therefore,under the background of the energy hub,the optimal operation of the Integrated Energy System based on electricity-gas interconnection is studied,the optimal operation model of the energy hub with power to gas equipments considering the uncertainties and the optimal operation method of Integrated Energy System with multiple energy hubs taking into account the cooperative game is estabished.The main research work in this thesis is as follows:Firstly,the detailed mathematical models of various energy supply units,such as wind turbines,power to gas equipments,gas boilers,combined heat and power(CHP),electric and thermal energy storage units in the Integrated Energy System are given.Based on the above models,the models of energy supply side,energy conversion link and load storage side of the energy hub are constructed.For energy hubs with different application scenarios,it is only necessary to change the matrix elements corresponding to the equipments during modeling,which greatly simplifies the complexity of modeling.Secondly,the actual operational risk of uncertainties in the optimal operation of Integrated Energy System is considered,aiming at the uncertainties such as wind power,the demand of load and random disruption of components.A large number of initial scenes are generated by the combination of roulette wheel mechanism and Monte Carlo,then the typical scenes are retained by the backward scene reduction technique.On this basis,an optimal operation model of energy hub based on uncertainty is constructed,the objective of the optimization is to minimize the operating cost of the system and the environmental cost of the lowest CO2 emission of the system,the constraints of the system power balance and output range of the equipments are satisfied.By the weighted normalization of the multi-objective functions,the transformation from multi-objective function to single-objective function is realized and then the improved particle swarm optimization algorithm is used to solve the problem.Finally,the effects of wind power,load uncertainty and random disruption of components on the output of various equipments in energy hub are analyzed by simulation.Finally,the cooperative optimal operation of Integrated Energy System of electricity-gas interconnection based on the integration of multiple adjacent energy hubs in this thsis is studied.Considering the autonomy and privacy of the energy hub,the coordination optimization problem is modeled as a cooperative game problem based on bargaining.By using the distributed optimization method,the original game problem is decomposed into two-layer local sub-problems for each energy hub,cooperative energy hubs bargin with each other about the exchanged energy and related payment costs to obtain the optimal unit output and exchanged energy.Energy hubs exchange energy by optimal energy exchange value,which can minimize their own operating costs and ensure effective cooperation among all energy hubs.The simulation results show that the effectiveness of the operation method based on bargaining cooperative game optimization. |
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