Abstract
To alleviate environmental pollution and improve the energy efficiency of end-user utilization, the integrated energy systems (IESs) have become an important direction of energy structure adjustment over the world. The widespread application of the coupling units, such as gas-fired generators, gas-fired boilers, and combined heat and power (CHP), increases the connection among electrical, natural gas, and heating systems in IESs. This study proposes a mixed-integer nonlinear programming (MINLP) model combining electrical, natural gas, and heating systems, as well as the coupling components, such as CHP and gas-fired generators. The proposed model is applicable for either the radial multi-energy network or the meshed multi-energy network. Since the proposed MINLP model is difficult to be solved, the second-order cone and linearized techniques are used to transform the non-convex fundamental matrix formulation of multi-energy network equations to a mixed-integer convex multi-energy flow model, which can improve the computational efficiency significantly. Moreover, the potential convergence problem of the original model can also be avoided. A simulation of IEEE 14-node electrical system, 6-node natural gas system, and 23-node heating system are studied to verify the accuracy and computational rapidity of the proposed method.
Highlights
With the rapid development of the economy, energy and environmental problems have become increasingly prominent
The multi-energy flow solution model of the joint electric/ heating/gas network is established, and the practicability and rapidity of the method proposed in this article are proven by practical examples
The integrated energy system with electricity, gas, and heat is composed of a power system, thermal system, natural gas systems, and the coupling units such as combined heat and power (CHP), gas turbine, and gas boilers
Summary
With the rapid development of the economy, energy and environmental problems have become increasingly prominent. Considering different operation modes of CHP units, two models of cogeneration are established, including the backpressure model and the pumping model On this basis, the multi-energy flow solution model of the joint electric/ heating/gas network is established, and the practicability and rapidity of the method proposed in this article are proven by practical examples. The integrated energy system with electricity, gas, and heat is composed of a power system, thermal system, natural gas systems, and the coupling units such as CHP, gas turbine, and gas boilers. The original Weymouth equation, which represents the relationship between the natural gas flow with the pressure at the inlet and the outlet of a natural gas pipeline, is a non-convex and nonlinear problem and hard to solve directly.
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