ABSTRACT Increased penetration of the combined operation of hydraulic power plants with electrical energy storage systems has pushed the state of the art of hybrid operation of hydropower. As the body of work is growing this review article aims to provide a thematic review on the objectives of hybrid operation of hydropower and the control strategies and dimensioning methodologies of auxiliary energy storage systems to achieve these objectives. The works reviewed are categorized thematically according to whether the contribution is a commercial objective or rather contributing to increased security of supply. Increased revenue from being able to qualify for ancillary services such as frequency regulation and reduced operational costs through reducing wear are the primary commercial objectives. Improved black‐start capability, stability regions and island operation are objectives relating to security of supply. State‐of‐the‐art methodologies on control and dimensioning of hybrid systems for the proposed objectives are presented. A quantitative survey of commercial hybridization projects focusing on the Nordic countries has been performed, highlighting regional disparities in technology adoption. The review highlights gaps in the literature concerning the translation of wear reduction metrics into operational cost savings.
Döhlen et al. (Thu,) studied this question.
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