Abstract
Integrated energy systems (IESs) are considered a trending solution for the energy crisis and environmental problems. However, the diversity of energy sources and the complexity of the IES have brought challenges to the economic operation of IESs. Aiming at achieving optimal scheduling of components, an IES operation optimization model including photovoltaic, combined heat and power generation system (CHP) and battery energy storage is developed in this paper. The goal of the optimization model is to minimize the operation cost under the system constraints. For the optimization process, an optimization principle is conducted, which achieves maximized utilization of photovoltaic by adjusting the controllable units such as energy storage and gas turbine, as well as taking into account the battery lifetime loss. In addition, an integrated energy system project is taken as a research case to validate the effectiveness of the model via the improved differential evolution algorithm (IDEA). The comparison between IDEA and a traditional differential evolution algorithm shows that IDEA could find the optimal solution faster, owing to the double variation differential strategy. The simulation results in three different battery states which show that the battery lifetime loss is an inevitable factor in the optimization model, and the optimized operation cost in 2016 drastically decreased compared with actual operation data.
Highlights
With the rapid development of society and the gradual improvement of technology, the traditional energy supply pattern is facing huge challenges, as the large scale and centralized energy supply cannot march the diverse and differential energy demand [1]
The simulation results in this paper highlight that different energy loss states of the battery have an unavoidable influence on optimization results, which is not widely developed in the operation optimization of Integrated energy systems (IESs)
An optimization model of an integrated energy system consisting of photovoltaic, combined heat and power generation system (CHP) and battery energy storage systems (BESSs) is built, which aims to get the minimum operation cost while considering the lifetime loss of battery life
Summary
With the rapid development of society and the gradual improvement of technology, the traditional energy supply pattern is facing huge challenges, as the large scale and centralized energy supply cannot march the diverse and differential energy demand [1]. The severe energy crisis and environmental pollution problems force the energy supply pattern to be more sustainable and cleaner [2]. The IES is an extension of traditional energy applications, and it is a physical concept of a hybrid energy system, via integrating renewable energy generation, energy storage and other energy technologies, which could achieve the collaborative operation of various power sources, while obtaining certain benefits [5]. On the energy supply side, IES systems mainly exploit renewable energy sources such as wind power, photovoltaic and natural
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