Abstract
Integrated energy system (IES) is of great significance in the construction of the modern energy system. Reasonable planning is one of the important means to improve the economy of the IES and promote the consumption of renewable energy. However, the complex coupling characteristics between energy sources make it difficult to quantify the production efficiency of multi-energy heterogeneous resources uniformly in the economic benefit model during the planning cycle. Quantifying the production efficiency of the IES for planning is currently an urgent problem to be solved. This study proposes a planning method for the IES based on the life cycle and emergy theory. First, emergy theory is applied to quantify the production efficiency of the IES. A complete economic benefit model is established based on life cycle theory. Second, a bi-level planning model of the IES is established. The upper-level model aims at minimizing the whole life cycle cost of the IES to plan the capacity and location of the coupling equipment. The lower-level model aims at maximizing the emergy yield ratio of the IES to provide the operating data for the upper level. Finally, comparing experimental evaluations with traditional planning schemes considering annual average cost and energy quality coefficient, the method in this study reduces planning costs by 23.16% and increases the consumption rate of renewable energy by 4.26%. It can be seen that the planning method proposed in this study improves the planning economy and the level of renewable energy consumption of the IES.
Highlights
Integrated energy system (IES) is an effective way to centralized supply of multi-energy and improves the absorptive capacity of renewable energy
The whole life cycle (LC) theory and emergy theory are introduced, and the bi-level programming model of the IES is established to optimize the selection of the equipment in energy hub (EH)
The upper-level model takes the cost of system planning, construction, operation, and scrapping into consideration, aiming at the minimum cost of the whole LC to provide the siting and sizing scheme for the lower level model
Summary
Integrated energy system (IES) is an effective way to centralized supply of multi-energy and improves the absorptive capacity of renewable energy. The objective of the current research on IES planning is mainly to determine the economic benefits of the system according to the market value of the equipment and energy in the system (Wang et al, 2018b) and to establish equipment selection and capacity allocation model of the EH In this process, the energy quality coefficients based on the exergy theory are applied to uniformly quantify the energy values of different energy forms usually based on different energy coupling methods (Chen et al, 2018). The main contributions of the study are as follows: 1) The energy conversion efficiency in the IES planning process is accurately quantified based on emergy theory. The emergy yield ratio EYR is as follows: EYR Y/F
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