Abstract
With the widespread attention on clean energy use and energy efficiency, the integrated energy system (IES) has received considerable research and development. This paper proposed an electricity-gas IES optimization planning model based on a coupled combined cooling heating and power system (CCHP). The planning and operation of power lines and gas pipelines are considered. Regarding CCHP as the coupled hub of an electricity-gas system, the proposed model minimizes total cost in IES, with multistage planning and multi-scene analyzing. Renewable energy generation is also considered, including wind power generation and photovoltaic power generation. The numerical results reveal the replacing and adding schemes of power lines and gas pipelines, the optimal location and capacity of CCHP. In comparison with conventional separation production (SP), the optimization model which regards CCHP as the coupled hub attains better economy. At the same time, the influence of electricity price and natural gas price on the quantities of purchasing electricity and purchasing gas in the CCHP system is analyzed. According to the simulation result, a benchmark gas price is proposed, which shows whether the CCHP system chooses power generation. The model results and discussion demonstrate the validity of the model.
Highlights
Owing to low capital costs, high thermal efficiency, and relatively low fuel cost, natural gas-fired generation is more attractive than traditional fossil units
Motived by the issue above, the main contributions of the paper are as follows: (1) This paper proposes a mixed-integer linear programming (MILP) optimization planning model of integrated energy system (IES) based on the coupled combined cooling heating and power system (CCHP)
11-node lowsystem pressure natural gas IES network topology is shown in network anddistribution a 11-node low pressure network
Summary
Owing to low capital costs, high thermal efficiency, and relatively low fuel cost, natural gas-fired generation is more attractive than traditional fossil units. The interactions between electrical and gas systems have become tighter [2,3]. Based on this background, it is necessary to regard the electrical and gas systems as an integrated energy system (IES) [4,5]. IES can bring a great number of benefits, which mainly include complementary strengths of diverse energy systems for system operation and design, facilitating the integration of local renewable and sustainable energy resources, carbon emission reduction by increasing the whole system reliability and energy efficiency, improved system reliability and resilience [6]
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