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A flexible and deep peak shaving scheme for combined heat and power plant under full operating conditions

Author

Listed:
  • Hou, Guolian
  • Huang, Ting
  • Jiang, Hao
  • Cao, Huan
  • Zhang, Tianhao
  • Zhang, Jianhua
  • Gao, He
  • Liu, Yong
  • Zhou, Zhenhua
  • An, Zhenyi

Abstract

Improving the flexible and deep peak shaving capacity of combined heat and power (CHP) plant under full operating conditions to facilitate renewable energy consumption is the main choice of novel power system. Accordingly, a dry/wet state automatic conversion control scheme fuses the precise mechanism structure, reinforcement learning and multi-objective model predictive control (MPC) algorithms is designed to promote the deep peak shaving ability of CHP plant in this paper. Firstly, the detailed mechanism models of once-through boiler at dry and wet state are presented by analyzing the dynamic characteristics of steam-water flow. Secondly, the large-scale unknown parameters in mechanism models are identified via the Takagi-Sugeno fuzzy modeling, reinforcement learning algorithms and actual dry/wet state conversion data. Thanks to the proposed hybrid modeling strategy, the high-precision boiler-steam unit models at dry and wet state are rapid obtained. Then, to meet different peak shaving demands, the multi-objective MPC algorithm is respectively constructed under dry and wet state with the comprehensive consideration of operational constraints, load tracking error, algorithm stability, power generation cost, CO2 and NOx emission costs. Aiming at maximizing the peak shaving efficiency and flexible operation ability of plant, a dry/wet automatic control scheme combined the designed multi-objective MPC algorithms and identified dry/wet state models is proposed. Finally, the load variation rate of 5 % and 2 % RCM/min is respectively achieved in the dry/wet state conversion tests on a 350 MW CHP plant based on the proposed control scheme. Thus, the rapid and thorough dry/wet state conversion performance of once-through boiler has successfully improved the operational flexibility of CHP plant under full operating conditions.

Suggested Citation

  • Hou, Guolian & Huang, Ting & Jiang, Hao & Cao, Huan & Zhang, Tianhao & Zhang, Jianhua & Gao, He & Liu, Yong & Zhou, Zhenhua & An, Zhenyi, 2024. "A flexible and deep peak shaving scheme for combined heat and power plant under full operating conditions," Energy, Elsevier, vol. 299(C).
    • Handle: RePEc:eee:energy:v:299:y:2024:i:c:s0360544224011757
    DOI: 10.1016/j.energy.2024.131402
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