Abstract
The off-design performance of compressed air energy storage (CAES) system is crucial when integrated with intermittent renewable energy generation due to increasing requirements for demand response and a wide range of part-load operation. In this study, a computationally efficient bi-directional nozzle control strategy was developed to optimize nozzle openings of multistage radial-inflow turbines during the discharge process, which is shown to minimize the energy loss of CAES and meet the requirements for demand response control. In addition, a quasi-steady-state method was employed to simulate the part-load operation using a mean-line model for radial-inflow turbines, and thermodynamic models for the rest of CAES components. According to our analysis, the optimized bi-directional nozzle control strategy is able to improve the discharge efficiency of a multistage radial-inflow turbine by 2–7% under part-load operation (≤50% of rated load), compared with only adjusting the nozzle opening of the first stage. We also compared nozzle control with valve throttling that is commonly used for CAES. Although there was a decrease in turbine efficiency, the proposed nozzle control strategy significantly increased discharge efficiency by 10–18% under part-load operation due to the absence of throttling losses. Our study demonstrated that the bi-directional nozzle control is an effective solution for part-load operation of CAES systems.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
