Performance Assessment for Primary Frequency Regulation of Variable-Speed Pumped Storage Plant in Isolated Power Systems

Sha Li, Zezhou Cao, Kuangqing Hu and Diyi Chen ()
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Sha Li: Institute of Water Resources and Hydropower Research, Northwest A&F University, Xianyang 712100, China
Zezhou Cao: Institute of Water Resources and Hydropower Research, Northwest A&F University, Xianyang 712100, China
Kuangqing Hu: Institute of Water Resources and Hydropower Research, Northwest A&F University, Xianyang 712100, China
Diyi Chen: Institute of Water Resources and Hydropower Research, Northwest A&F University, Xianyang 712100, China

Energies, 2023, vol. 16, issue 3, 1-16

Abstract: Primary frequency regulation (PFR) is a crucial operating condition for PSPs to realise frequency modulation, and the effectiveness of PFR is significant to the stability of power system frequency. Several challenges and risks have been presented in the PFR process for conventional PSPs, especially for those which run in the isolated grid, such as water inertia, negative damping of speed governor and ultra-low frequency oscillation (ULFO). Variable-speed pumped storage plants (VSPSPs) have the potential to overcome the negative impacts on regulation performance caused by hydraulic factors, due to the advantages of rapid power regulation and independent active power control from turbine output. In this paper, the primary task is to conduct a comprehensive assessment for PFR performance of VSPSPs in isolated power systems. Initially, the hydraulic–mechanical–electrical numerical models are established. Secondly, the rotational speed stability of the pump-turbine is quantified and the advantages of VSUs in suppressing ULFO are assessed. Relevant results reveal that the performance of VSUs is better than that of FSUs in the regulation process. Finally, assessments of frequency regulation performance under various scenarios are conducted with four indicators (standard deviation of power differences, power regulation time delay, settling time and overshoot).

Keywords: variable-speed pumped storage plants; primary frequency regulation; sensitivity analysis; isolated operation mode (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
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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