| With the increasing of social and economic development to energy demand and environmental protection attention,the limitation and pollution of traditional fossil energy urge people to look for new energy alternatives.The multi-energy coupling system realizes the coordination and complementarity between different energy sources by integrating and optimizing multiple energy sources,which opens up new ideas for solving energy and environmental problems.Multi-energy coupling system can effectively take advantage of the complementary characteristics of different energy sources,and fully improve the comprehensive energy efficiency and renewable energy consumption capacity.However,the net load fluctuation in the multi-energy coupling system is intensified,resulting in a great impact and influence on the system due to the large-scale grid connection of renewable energy.On the premise of ensuring the economy of the system,the flexibility of multi-energy coupling system is fully exploited to adjust and respond to the variation of power within the system so as to further improve the safety and stability of operation.Therefore,it is particularly important to consider the flexibility in the optimal allocation of multi-energy coupling system.It is necessary to predict the flexible demand of the system,to make full use of the flexible supply resources,and to evaluate the flexibility of the system reasonably.Based on the above analysis,the optimal allocation of multi-energy coupling system considering the flexible supply and demand matching is worthy of in-depth study.The main research contents are as follows:(1)Quantify the flexible demand and supply of multi-energy coupling system,and establish the evaluation index of flexible supply and demand matching.According to the energy consumption characteristics of multi-energy coupling system,a flexible demand forecasting model representing the fluctuation level of net load is established by using the method of probabilistic statistics.Based on the operation and output characteristics of flexible supply resources in the system,its basic mathematical model is constructed.Considering the characteristics of flexibility and multi-energy coupling system,the flexibility evaluation index considering the flexible supply and demand matching is constructed,so as to quantify the matching of flexible supply and demand in the system.(2)An optimal allocation model considering flexible supply and demand matching is established,which focus on the source side regional multi-energy coupling system with renewable energy and thermal power unit.Based on the coordination and complementarity characteristics of multi-energy coupling system,the flexible demand composed of wind,PV and load forecasting errors in the system are constructed.According to the output characteristics of thermal power and energy storage equipmenteach considering its flexibility,mathematical models of flexible supply resource is built.Then,taking the optimization of annual comprehensive income as the goal and considering the constraints of flexible supply and demand matching index,the optimal allocation model of regional multi-energy coupling system is constructed.The model is transformed into a mixed integer linear programming model by using linearization method,which is solved by GUROBI 9.0.2 solver,and the optimal allocation scheme considering flexible supply and demand matching is obtained.The scheme achieves the optimal comprehensive income of the system under the premise of satisfying the expected flexibility level of the system with the consideration of multi-energy coupling system.What’s more,it further improves the flexibility of the system operation on the basis of realizing the economic operation of the system.(3)Taking the off-design performance and flexible supply and demand matching into consideration,the optimal allocation model of community multi-energy coupling system is established.Aiming at the obvious off-design performance of the energy consumption of each equipment in the system,mathematical models of off-design performance affected by various factors such as partial load rate and environmental change is established taking the load side community multi-energy coupling system including electricity,gas,heat and other energy coordination as the object.For the purpose of improving the system’s ability to deal with the uncertainty of renewable energy input and multi-energy load demand,the optimal allocation model of community multi-energy coupling system is established.This model takes the flexible supply and demand matching index as the constraint and aim at optimizing the total cost of system allocation,and the allocation scheme considering the flexible supply and demand matching and the off-design performance is proposed.Under the condition of meeting the expected flexible supply and demand matching of the coupling system,the input-output relationship of the equipment in the system under different working conditions is taken into account.On the premise of economic optimization of the coupling system,the energy demand and consumption characteristics of the system are evaluated more accurately,which is more in line with the actual engineering needs. |
