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A multi-objective optimization scheduling approach of integrated energy system considering the exergy efficiency using the variable step-size approximation method

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  • Liu, Shuaidong
  • Han, Song
  • Tian, Junling
  • Rong, Na

Abstract

As an important part of the new power system, it is crucial to consider the efficiency, economy and environment of the integrated energy system simultaneously. In order to improve the efficiency of solving multi-objective optimization scheduling problems for integrated energy systems, a variable step-size approximation method is proposed in this paper. Firstly, a model of integrated energy system is constructed, and the source-side and load-side exergy equations of different energy networks are given, as well as the mathematical expressions of equipment by combining the idea of unification. Secondly, in comparison with the ergodic weights approach, the variable step-size approximation method theoretical minimum reduction percentage of solution time is deduced by mathematical methodology under the m objective functions. Finally, the results from an integrated energy system including a modified New England 30-bus system, a 6-node heat network and a 7-node gas network demonstrate that the multi-objective function proposed compromises the economy, environment and efficiency of integrated energy system compared to the traditional optimization problem. In comparison with the ergodic weights approach, the step size approximation method can save over 97 % of the solution time, and the percentage of average error can be as low as 0 % under the multi-objective functions.

Suggested Citation

  • Liu, Shuaidong & Han, Song & Tian, Junling & Rong, Na, 2024. "A multi-objective optimization scheduling approach of integrated energy system considering the exergy efficiency using the variable step-size approximation method," Energy, Elsevier, vol. 311(C).
    • Handle: RePEc:eee:energy:v:311:y:2024:i:c:s0360544224031463
    DOI: 10.1016/j.energy.2024.133370
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