| In recent years,clean energy is promoting the innovation and transformation of the energy industry due to the non-renewable nature of fossil energy.With the progress of social life standards,the type of energy loads are increasing,and the coordinate scheduling capabilities of various energy network is facing great challenges.In order to improve the utilization rate of primary energy,the operational efficiency and safety of energy supply system,the concept of integrated energy system(IES)has emerged in the energy field.On this basis,in order to make users to a reasonable energy source use,a reasonable energy pricing strategy is urgently needed considering the increase of coupling cost among various energy sectors.Under the background of this subject that above mentioned,the main work in this paper are as follows:First of all,the research status of electricity-gas-heat integrated energy systems and node price is described,and the steady mathematical model and modeling method of electricity power subsystem,natural gas subsystem and district heating subsystem in integrated energy system are explored,the operation mechanism and operation characteristics of each subsystem are analyzed,and the interactive coupling relationship between multi-energy systems is revealed.Secondly,through the analysis of electricity-gas-heat coupling link(natural gas-fired generators and combined heat and power units),the optimal scheduling model of electricity-gas-heat integrated energy system with the goal of minimizing operating cost of integrated energy system and cost of carbon emission is established,and solve the optimal multi-energy flow of this model.Using the integrated energy system composed of PJM-5 bus power network,7 node gas network and 6 node district heat network as an example,the optimal multi-energy flow in carbon emission-embedded system is analyzed.The results show that the proposed model can ensure the minimum total cost of IES on the basis of reducing carbon emissions,the practicability of the this model is further verified by the integrated energy system composed of IEEE-39 bus power system,Belgian 20 node natural gas system and 6-node heat system.Finally,a multi-energy pricing strategy,node energy price,is proposed on the basis of the theory of nodal electricity price.Based on the optimal dispatching model of electricity-gas-heat integrated energy system,and the locational marginal price of various energy in the integrated energy system is determined.By an example,the changes of nodal electricity price,gas price and heat price are analyzed when the congestion occurs in power subsystem,natural gas subsystem or heat subsystem.The influence of carbon emission cost on node energy price is further analyzed.The results have showed that the pricing strategy of electricity-gas-heat integrated energy system takes into account the interaction among multi-energy systems,can provide an effective and reasonable pricing mechanism,and provide reference for various participants in the energy market. |
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