A dynamic hybrid model of supercritical once-through boiler-turbine unit including recirculation mode and once-through mode

Yan Xie, Ji-zhen Liu, De-liang Zeng, Yong Hu, Rui-lian Li and Yan-song Zhu

Energy, 2024, vol. 309, issue C

Abstract: Supercritical once-through boiler-turbine units play a paramount role in maintaining grid stability owing to their exceptional efficiency and flexibility. Nevertheless, achieving precise modeling of this device under various operational conditions remains a significant challenge. This study conducts modeling and simulation of an actual supercritical once-through coal-fired power plant. The findings signify that the hybrid model proposed herein adeptly encompasses all operational modes of supercritical once-through units, including start-up recirculation mode and once-through mode. To bolster model precision, an optimization algorithm grounded on weighted mean of vectors (INFO) has been employed for parameter identification, while the INFO-XGBoost was utilized to fashion a machine learning model for static parameters. It has been validated that the developed model accurately captures the dynamic characteristics of the unit. Furthermore, the utilization of the INFO-XGboost to model static parameters has been proved to enable the errors in principal outputs of coordinated control system to be within 0.35 % of MAPE across the entire operational process, thus facilitating the design of more refined and intelligent control systems.

Keywords: Supercritical once-through boiler-turbine unit; Dynamic hybrid model; INFO; INFO-XGBoost; Recirculation mode; Once-through mode (search for similar items in EconPapers)
Date: 2024
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Citations: View citations in EconPapers (1)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:309:y:2024:i:c:s0360544224027154

DOI: 10.1016/j.energy.2024.132941

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