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An novel soft-linking model: Coordinating the regulative flexibility and operational stability of pumped storage units

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  • Zhang, Meng
  • Xiao, Yu
  • Gao, Yuanqiang
  • Li, Daiyu
  • Zhao, Ziwen
  • Li, Jianling
  • Lei, Liuwei
  • Liu, Zhengguang
  • He, Mengjiao
  • Chen, Diyi

Abstract

The transformation of power systems towards greater flexibility and renewables is exacerbating the balancing challenge between flexibility and stability requirements for pumped storage (PS) units, as frequent ramping of PS stations for load balancing intensifies the operational switching. However, the flexible regulation and stable operation of units are often independently analyzed in previous research, making it difficult to achieve coordinated optimization for the PS flexibility and stability of PS units. Therefore, this paper develops a novel soft-linking coupling model between the power system unit commitment and pump-turbine governing system by utilizing the coupled relationship of parameters between the system and units (output power and water head). Moreover, it introduces new operational indicators for units, including the frequency of load changes and speed change rate. The improved Random Entropy TOPSIS method is employed to construct a comprehensive evaluation system for the flexibility and stability of PS units. Finally, a case study is conducted on a hydro-wind-photovoltaic complementary system to investigate the influence of wind/solar capacity ratio, unit's flexible parameters, and reservoir operation modes on the flexibility and stability of units. The comprehensive assessment shows that in the scenarios where the wind/solar capacity ratio is 1:5, the highest score of 85.99 (S4, ramp rate of 0.7 and power output range 0.5) exceeds the lowest scoring scenario (S1, ramp rate 0.75 and power output range 0.4) by 19.17. Despite 8.7% higher flow variance in the highest score scenario compared to the lowest scenario; the flexibility deficit rate, torque variance, and frequency stabilization time exhibit better performance with reductions of 3.91%, 4.8%, and 4.3%, respectively. This paper provides a foundational model for the coordination of flexible regulation and stable operation of PS units.

Suggested Citation

  • Zhang, Meng & Xiao, Yu & Gao, Yuanqiang & Li, Daiyu & Zhao, Ziwen & Li, Jianling & Lei, Liuwei & Liu, Zhengguang & He, Mengjiao & Chen, Diyi, 2024. "An novel soft-linking model: Coordinating the regulative flexibility and operational stability of pumped storage units," Applied Energy, Elsevier, vol. 374(C).
    • Handle: RePEc:eee:appene:v:374:y:2024:i:c:s0306261924013254
    DOI: 10.1016/j.apenergy.2024.123942
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    References listed on IDEAS

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