An novel soft-linking model: Coordinating the regulative flexibility and operational stability of pumped storage units
Meng Zhang,
Yu Xiao,
Yuanqiang Gao,
Daiyu Li,
Ziwen Zhao,
Jianling Li,
Liuwei Lei,
Zhengguang Liu,
Mengjiao He and
Diyi Chen
Applied Energy, 2024, vol. 374, issue C, No S0306261924013254
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.
Keywords: Pumped storage; Soft-linking model; Flexibility; Stability; Comprehensive performance (search for similar items in EconPapers)
Date: 2024
References: Add references at CitEc
Citations:
Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0306261924013254
Full text for ScienceDirect subscribers only
Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.
Export reference: BibTeX
RIS (EndNote, ProCite, RefMan)
HTML/Text
Persistent link: https://EconPapers.repec.org/RePEc:eee:appene:v:374:y:2024:i:c:s0306261924013254
Ordering information: This journal article can be ordered from
http://www.elsevier.com/wps/find/journaldescription.cws_home/405891/bibliographic
http://www.elsevier. ... 405891/bibliographic
DOI: 10.1016/j.apenergy.2024.123942
Access Statistics for this article
Applied Energy is currently edited by J. Yan
More articles in Applied Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu (repec@elsevier.com).