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Integration Optimization of Integrated Solar Combined Cycle (ISCC) System Based on System/Solar Photoelectric Efficiency

Zuxian Zhang, Liqiang Duan (dlq@ncepu.edu.cn), Zhen Wang and Yujie Ren
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Zuxian Zhang: Key Laboratory of Power Station Energy Transfer Conversion and System, Ministry of Education, National Thermal Power Engineering & Technology Research Center, School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China
Liqiang Duan: Key Laboratory of Power Station Energy Transfer Conversion and System, Ministry of Education, National Thermal Power Engineering & Technology Research Center, School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China
Zhen Wang: Key Laboratory of Power Station Energy Transfer Conversion and System, Ministry of Education, National Thermal Power Engineering & Technology Research Center, School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China
Yujie Ren: China Academy of Building Research, Beijing 100013, China

Energies, 2023, vol. 16, issue 8, 1-22

Abstract: Integrated solar combined cycle (ISCC) systems play a pivotal role in the utilization of non-fossil energy; however, the efficient application of solar energy has emerged as a primary issue in the study of ISCC systems. Therefore, it is extremely urgent to propose the best optimization scheme for ISCC under different operating conditions. In this paper, according to the idea of temperature matching and cascade utilization, the optimization of the ISCC system is carried out with the genetic algorithm for the whole working conditions, and the optimization schemes with the highest photoelectric efficiency and system efficiency under different working conditions are derived. In comparison with two optimization schemes with different objective functions, the conclusion can be drawn that: At 100% gas turbine load—30% DNI and 100% gas turbine load—100% DNI working conditions, respectively, the maximum system efficiency of 56.32% and the maximum solar photoelectric efficiency of 35.5% are attained. With the decreasing of gas turbine load, the solar energy integration position will gradually change from the topping cycle to the bottom cycle; with the gas turbine load variation from 100% to 75%, the optimal photoelectric efficiency model prefers two-stage integration, and up to 141.3 MW of solar energy could be integrated, which is greater than the maximum value of 127.1 MW for the optimal system efficiency model. Regarding the heat collection choice of bottom cycle, the optimal photoelectric efficiency model prefers the high-pressure boiler (HPB), while the optimal system efficiency model prefers the high-pressure superheater (HPS). The comparison between the optimal solution and the actual cases confirms the correctness of the optimization results and provides guidance for the subsequent ISCC study.

Keywords: integrated solar combined cycle; optimization; solar photoelectric efficiency; system efficiency (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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Citations: View citations in EconPapers (1)

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