| In recent years,the concept of Internet Plus Smart Energy(energy internet)and integrated energy system(IES)has promoted the deep coulping of diffenert energies like electricity,natural gas and heat.Thus,various energy systems can not be operated seperately.In this case,the concept of integrated energy distribution system(IEDS)is shown up as the times require,where power distribution system is taken as the core.It benefits from comprehensive utilization of complementary features of multi-energy flow,as well as the synergies of various energy links,including energy sources,energy networks,loads and energy storages.It is conducive to achieve the goals of economical and stable operation,renewable energy integration and comprehensive energy efficiency enhancement.IEDS can be regarded as a viable development mode of the future power distribution system.This paper focuses on multi-energy flow modeling and economic dispatch algorithm in IEDS,the main work of this paper can be summarized as follows:1)Different energy links in IEDS affect each other,to address this issue,an influence mechanism analysis method of IEDS is proposed by considering the changes of natural gas networks.The changes of gas quality,load adjustment and introduction of gas injection can affect the energy subsystems coupled via energy interaction.In order to quantify the transfer relationship of key operational variables,the multi-energy comprehensive solution framework is studied along with gas load-pressure sensitivity analysis.Verified by case studies,IEDS energy supply can be improved by reasonable utilization of the changes mentioned above.2)In order to study the complementary characteristics of multi-energy flow,a multi-energy flow optimization method is proposed considering operation constraints.Regional hybrid energy station is modeled based on the concept of energy hub.The multi-energy flow optimal scheduling solution framework is built by setting operational constraints(including energy flow constraints and regional hybrid energy station constraints),which leads to the rational utilization of energy.The results of case studies also indicate that the reasonable set of operational constraints is conductive to achieve the goals of economy,meanwhile,safe and stable operation status can be obtained.3)In order to fully explore the adjustable potential of IEDS demand side resources in optimal scheduling,a method of demand side controllable loads aggregation and control as well as optimal scheduling is proposed in a wind-hydrogen integrated energy distribution system.By applying the optimal energy state regulation demand response control strategy,the model of efficient power plant(EPP)is constructed and studied based on the analysis of operation constraints and energy demand requirements.As a demand side self-regulating resource,EPP can be involved into the optimal scheduling process.The reserve capacity supplied by EPP is propitious for the integration of renewable energy,which also change the output ratio of high-carbon sources and lowcarbon sources.4)In order to overcome the cost and functionality limitations of the existing energy storage technologies,the concept of generalized multi-source energy storage system(GMSES)is proposed,which consists of conventional storage resources(CES),energy system integration(ESI)resources and demand response resources(DRR).Given the fact that energy forecast and measurement results in power deviation,a hierarchical optimal scheduling framework is studied,which includes day-ahead scheduling,intrahour scheduling and ultra-short scheduling.Results of case studies show that the method mentioned above facilitates the economic and stable operation. |
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