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Strategy design and comprehensive performance evaluation of supercritical coal-fired power plants coupled with compressed air energy storage systems for peak-shaving

Author

Listed:
  • Xu, Qilong
  • Wang, Shuai
  • Luo, Kun
  • Fan, Jianren

Abstract

The inherent volatility and intermittency of wind and solar energy continue to challenge the stability and reliability of power systems. Consequently, achieving effective peak-shaving for these fluctuating power sources represents a critical challenge for modern power grids. Firstly, this study pioneers a deeply integrated model coupling a 600 MW coal-fired power plant (CFPP) with advanced adiabatic compressed air energy storage (AA-CAES). Secondly, this study designs five energy storage schemes and eight energy release schemes for this integrated peak-shaving system. During energy storage process, Case S1 (discharge to the No. 8 heater) achieves the highest peak-shaving capacity and depth of 28.68 MW and 4.78 %, respectively. During energy release process, Case R4 (discharge to the 4th-section extraction) delivers the highest peak-shaving capacity and depth of 11.22 MW and 1.87 %, respectively. The unit's thermal efficiency is also highest at Case R4, 41.70 %. Moreover, a novel comprehensive evaluation system is constructed to evaluate the performance of different schemes, and the best peak-shaving scheme is determined. Case S5 (to the deaerator) has the highest energy storage score of 0.748; Case R4 has the highest energy release score of 0.776. Finally, through detailed economic analysis, the feasibility of this integrated scheme is further demonstrated. This research significantly enhances the flexibility of CFPPs and provides robust support for transforming China's energy structure.

Suggested Citation

  • Xu, Qilong & Wang, Shuai & Luo, Kun & Fan, Jianren, 2026. "Strategy design and comprehensive performance evaluation of supercritical coal-fired power plants coupled with compressed air energy storage systems for peak-shaving," Renewable Energy, Elsevier, vol. 261(C).
    • Handle: RePEc:eee:renene:v:261:y:2026:i:c:s0960148126000327
    DOI: 10.1016/j.renene.2026.125207
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