Comprehensive Evaluation of the Flexibility of Hydro-Wind-Photovoltaic Power Generation System Based on Hierarchical-Entropy Method

To accurately, comprehensively, and objectively assess the contribution of hydropower to the flexibility of the hydro-wind-photovoltaic power generation system, this study establishes a model of the system and introduces a range of flexibility evaluation indicators, considering both subjective and objective aspects. Subsequently, a sophisticated evaluation method is developed for assessing the flexibility of hydro-windphotovoltaic power generation systems, utilizing the hierarchicalentropy method. The research outcomes underscore the influence of the wind/solar capacity ratio on the flexibility of the hydro-wind-photovoltaic power generation system. Nevertheless, an optimal ratio exists, enabling the system to achieve optimum flexibility. The highest comprehensive evaluation value of system flexibility is achieved when the ratio wind/solar capacity ratio is <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$1: 2$</tex>, with a score of 84.31. In consonance with this ratio, hydropower emerges as the most adaptable and reliable option, adept at meeting both load demand and the fluctuating requirements of new energy sources to the fullest extent. This study serves as a reference for improving the operational flexibility of the hydro-wind-photovoltaic power generation system and the planning of renewable energy systems.