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

Author

Listed:
  • Wang, Pengcheng
  • Zheng, Hao
  • Qian, Guoyuan
  • Luo, Jingzhen
  • Li, Huixian
  • Feng, Suzhen
  • Wang, Jinwen

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.

Suggested Citation

  • Wang, Pengcheng & Zheng, Hao & Qian, Guoyuan & Luo, Jingzhen & Li, Huixian & Feng, Suzhen & Wang, Jinwen, 2025. "Monthly and quarter-hourly hydro scheduling for assessing retrofit of conventional to reversible turbines with wind and PV integration," Energy, Elsevier, vol. 320(C).
    • Handle: RePEc:eee:energy:v:320:y:2025:i:c:s0360544225008655
    DOI: 10.1016/j.energy.2025.135223
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