| As the contradiction between energy consumption and environmental protection becomes more and more prominent,the integrated energy system(IES)with combined cooling heating and power(CCHP)as the core of energy supply is developing rapidly.It is an organic integration of different forms of energy supply systems such as electricity,heat,gas and cold,which is of great practical significance to the sustainable and healthy development of the energy sector.In the face of the emerging integrated energy market environment,it is necessary to develop an integrated demand response(IDR)mechanism for multi-energy coupling and conversion.At the same time,the gradual opening of the energy market makes it difficult for the traditional centralized dispatch to meet the needs of privacy protection and independent decision making of the district energy system containing multiple IESs.Therefore,this paper conducts the following research on integrated demand response and optimal dispatch of multi-region IESs:(1)Research on IES model and basic model of economic optimal dispatchBased on the typical energy supply framework of IES,the operating characteristics of the internal equipment are studied and the corresponding mathematical model is established.The basic model of economic optimal dispatch of IES is established with the objective of minimizing the operating cost by using the function of the power to gas(P2G)equipment to capture carbon dioxide to produce natural gas,and the model is established for the subsequent research of this paper.The simulation results show that P2 G improves system renewable energy utilization,carbon emissions and operating costs better than energy storage devices of the same capacity.(2)Research on economic optimal dispatch of IES considering IDRThe rapid emergence of multiple types of energy markets and energy services has led to the development of traditional power demand response towards integrated demand response.The paper investigates the correlation of loads of different energy types and response modes before and after the IDR on the demand side,and establishes a quantitative model of IDR on the customer side based on the conversion characteristics between multi-energy loads.Based on this,an economic optimal dispatch model of IES with IDR is proposed,and a flexible IDR strategy with transferable and switchable load response ratio as the regulation parameter is designed.The simulation results prove the effectiveness of the proposed model and show its usefulness in optimizing load resources and improving regional economy.(3)Research on hierarchical distributed economic optimal dispatch of multi-region IESsIn order to meet the needs of independent autonomy and privacy protection of each sub-region in the economic optimal dispatch of multi-region IESs,and to improve the model accuracy by considering the transmission delay of the heat network between subregions,the paper first proposes a hierarchical distributed operation framework based on the operational characteristics of the regional energy transmission network and the energy interaction between sub-region IESs.Then,based on the operation framework,a centralized dispatch model with economic optimization of multi-region IESs is established,and the centralized dispatch model is transformed into a hierarchical distributed optimal dispatch model with one-to-many cooperation between the upper and lower layers by the alternating direction multiplier method and iterative calculation with each other.Finally,a regional energy system with multiple sub-regional IESs is simulated,and the simulation results demonstrate the convergence and effectiveness of the model and algorithm,showing that the participation of the heat network structure with delay characteristics in the distributed dispatch can effectively improve the scheduling accuracy. |
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