Abstract
Due to the rising tensions surrounding the energy industry in response to the depletion of non-renewable energy sources and pollution of the environment, it is especially important to improve the energy utilization rate of integrated energy systems (IESs). Exergy is an important index to measure energy quality. Therefore, this paper proposes an IES operation optimization method based on exergy analysis and an adaptive genetic algorithm. First, based on the energy network theory, a unified expression of the exergy transfer process is given, and the energy level factor is introduced to evaluate the energy quality. Second, the steady-state expression of different forms of exergy in the energy transfer line is given. Third, the exergy economic model of the IES is established by combining exergy analysis, and the solution process of the adaptive genetic algorithm is given. Finally, the operation optimization simulation and analysis of an IES in Bali are carried out to verify the effectiveness of the exergy analysis method and feasibility of the simulation method.
Highlights
Due to increasing concerns regarding the environmental pollutants produced by coal-fired power generators and the low-efficiency energy utilization of conventional electrical power grids, which focus on electrical energy utilization but ignore other kinds of energy utilization [1], many researchers are searching for more environmentally friendly and less costly ways to supply energy
The differential of any form of energy potential function is equal to the product of the differential of the corresponding basic intensive quantity and the conjugate basic extensive quantity, that is, any form of energy can be expressed by the same mathematical expression, which provides a mathematical basis for the unified study of the transfer and conversion process of different forms of energy in theory
This paper proposes a novel unified modeling theory to analyze the degradation of the energy transfer process in integrated energy systems (IESs), which lays a theoretical foundation for maximizing the energy efficiency of IESs
Summary
To quantify the quality of different types of energy, exergy is defined as the largest theoretical energy potential that can be employed to do useful work [22], [23] Based on this definition, the exergy efficiency of a practical residential IES was calculated by Ebrahimi et al [24]. 2) To the best of the authors’ knowledge, this is the first study to propose a novel operational IES model based on the exergy losses in the transmission process to produce an optimal operational solution with higher efficiency and quality of energy utilization.
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