Monthly and quarter-hourly hydro scheduling for assessing retrofit of conventional to reversible turbines with wind and PV integration

Pengcheng Wang, Hao Zheng, Guoyuan Qian, Jingzhen Luo, Huixian Li, Suzhen Feng and Jinwen Wang

Energy, 2025, vol. 320, issue C

Abstract: The surge in renewable energy challenges grid stability, making energy storage urgent. Transforming conventional hydropower plants into hybrid pumped storage hydropower plants offers a promising solution, bypassing lengthy site selection and construction. The addition of reversible turbines alters plant's original operations, challenging accurate incorporation of pumping-generation mode into model to obtain hydro scheduling accurately. This study evaluates the conversion of hydropower plants and examines the complementary scheduling issues when wind-photovoltaic systems are included. A monthly and quarter-hourly coupled hydropower scheduling model is formulated to integrate typical daily quarter-hourly scheduling into each month by interpolating monthly storage into quarter-hourly levels, avoiding discrepancies between different scales, allowing the assessment of monthly-scale metrics while incorporating the quarter-hourly pumping-generation characteristics of hybrid pumped storage hydropower plants. Application to the Bailianhe Hydropower reservoir reveals the conversion enhances benefits and firm yield, particularly with a 214.2 % increase in benefits during dry years by leveraging quarter-hourly price fluctuations, ensuring a minimum output of 1.41 × 104 MWh even during the low-output months(August–November). The conversion reduces curtailment by over 78.3 % when wind-photovoltaic installations exceed 250 MW, and despite increased competition for high-price channel capacity between hybrid pumped storage and wind-photovoltaic, hybrid pumped storage-wind-photovoltaic system's benefits consistently surpass conventional hydropower-wind-photovoltaic system.

Keywords: Hydro scheduling; Hybrid pumped storage hydropower plants; Retrofit into reversible turbines; Hydro-wind-PV system; Coordinated operation; Benefit evaluation (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:320:y:2025:i:c:s0360544225008655

DOI: 10.1016/j.energy.2025.135223

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