Multi-dimensional quantitative assessment method for flexibility of hydro-wind-PV multi-energy complementary power generation systems across multiple time scales

Authors

• Xiangyi CHEN, Southwest Branch of State Grid Corporation of China, Chengdu 610041, China
• Quan QING, Southwest Branch of State Grid Corporation of China, Chengdu 610041, China
• Chunyi HUANG, School of Electrical Engineering, Southwest Jiaotong University, Chengdu 61756, ChinaFollow
• Yonglong ZHAO, Southwest Branch of State Grid Corporation of China, Chengdu 610041, China
• Ruoyun WANG, Southwest Branch of State Grid Corporation of China, Chengdu 610041, China
• Tu XU, Southwest Branch of State Grid Corporation of China, Chengdu 610041, China
• Kai LIAO, School of Electrical Engineering, Southwest Jiaotong University, Chengdu 61756, China

Keywords

MCPSs-HWP; flexibility; multi-dimensional; multi-timescale; long-term and medium-to short-termoperational correlation

Abstract

With the gradual transition of the energy system toward clean energy, multi-energy complementary power generation systems with hydro-wind-PV (MCPSs-HWP) have developed rapidly. However, the volatility and uncertainty of wind and PV output, as well as the seasonal variation of hydropower regulation capability, make the dynamic interactions of diversified generation resources across multiple time scales complex, and the key influencing factors of the flexible regulation capability of MCPSs-HWP and their influence mechanisms remain unclear. Therefore, this paper explores the differentiated characteristics of hydropower, wind power, and PV power over long-term and medium- to short-term horizons, and proposes a multi-dimensional quantitative assessment method for the flexibility of MCPSs-HWP across multiple time scales. First, the volatility and uncertainty of wind and PV, as well as the effects of interval inflow, hydraulic relationships, reservoir capacity, and other factors of cascade hydropower on the regulation capability of MCPSs-HWP, are analyzed, and flexibility assessment indices are constructed from three dimensions：regulation range, regulation speed, and regulation direction. Second, based on the balance relationship between power and energy, a flexibility supply-demand balance model across multiple time scales is established, and the long-term and medium- to short-term operational correlation of MCPSs-HWP is constructed. On this basis, a two-stage long-term and medium- to short-term operation model is developed using a chronological operation simulation method. Furthermore, scenario sets of wind and PV output and natural inflow considering volatility and uncertainty are generated based on the Monte Carlo method, and a flexibility index calculation method for MCPSs-HWP under multi-time-scale coupled operation is proposed. Finally, a case study of a river basin in Southwest China is conducted for simulation analysis, and the influence of key factors on the regulation capability of MCPSs-HWP is quantitatively investigated, verifying the effectiveness and practicality of the proposed method.

DOI

10.19781/j.issn.1673-9140.2026.02.019

First Page

212

Last Page

225

Recommended Citation

CHEN, Xiangyi; QING, Quan; HUANG, Chunyi; ZHAO, Yonglong; WANG, Ruoyun; XU, Tu; and LIAO, Kai (2026) "Multi-dimensional quantitative assessment method for flexibility of hydro-wind-PV multi-energy complementary power generation systems across multiple time scales," Journal of Electric Power Science and Technology: Vol. 41: Iss. 2, Article 19.
DOI: 10.19781/j.issn.1673-9140.2026.02.019
Available at: https://jepst.researchcommons.org/journal/vol41/iss2/19