Abstract
Integrated energy system (IES) has the advantages of improving energy efficiency, optimizing energy structure and reducing pollutant emissions, so it has become one of the most effective measures to solve the energy and environmental problems. To solve the planning problem of regional integrated energy system (RIES) without a given system structure, a zoning planning method (ZPM) based on energy hub (EH) model and the concept of directed acyclic graph is presented. That is, by analyzing the energy coupling relationship of EH, the EH zoning model based on equipment type is obtained, and the RIES system structure planning model is proposed. This method not only solves the problem that the planning results are influenced by the unfixed number of system structure planning model layers, but also can jointly plan the system structure and equipment configuration of RIES and improve computational efficiency. An illustrative example of RIES planning is given to make comparative analysis of the planning schemes obtained by hierarchical planning method (HPM), three-tier planning method (TPM) based on the equipment type and ZPM. The results show that ZPM can avoid the influence of the unfixed number of system structure planning model layers on the planning results, and can obtain more economical planning schemes and improve the solution speed of the planning model.
Highlights
Integrated energy system (IES) can achieve unified planning and dispatching for production, transmission, distribution, conversion, consumption and storage of various energy such as electricity, gas, cold and heat
In the first type of planning studies, there are nonlinear planning studies that use dispatch factors [7] to allocate equipment output energy[8], there are linear planning studies that consider the capacity of the equipment as continuous variables [9] or discrete variables with fixed steps[10], and there are planning studies that use binary variables to represent the choice of candidate equipment capacity [11, 12], which is more applicable for practical engineering applications
The above research indicates that IES planning research with given system structure has been relatively mature, while the IES planning without a given system structure has two problems: 1) the unfixed number of system structure planning model layers will affect the planning results and 2) too many candidate planning schemes reduce the planning efficiency of IES
Summary
Integrated energy system (IES) can achieve unified planning and dispatching for production, transmission, distribution, conversion, consumption and storage of various energy such as electricity, gas, cold and heat. The above two planning methods have certain IES planning versatility, but the energy coupling relationship is limited, especially the secondary energy conversion equipment cannot be directly coupled, resulting in the lack of flexibility in the IES’s system structure planning model, and the planning results may not be the comprehensive optimal solution of system structure and equipment capacity The above research indicates that IES planning research with given system structure has been relatively mature, while the IES planning without a given system structure has two problems: 1) the unfixed number of system structure planning model layers will affect the planning results and 2) too many candidate planning schemes reduce the planning efficiency of IES To solve these problems, this paper presents a zoning planning method (ZPM) to jointly plan the system structure and equipment configuration of RIES based on EH model and the directed acyclic graph.
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