SYSTEMATIC REVIEW ON FAST FREQUENCY ANCILLARY SERVICES PROVIDED BY LARGE-SCALE HYDROGEN ELECTROLYZER PLANTS

The decrease in physical inertia within AC grids may lead to more serious frequency deviations caused by power imbalances. To address these challenges attention has been paid to the potential of converter-connected resources to reduce frequency deviations. Since grid development plans aim to integrate a large capacity of hydrogen electrolyzer plants (HE) into the power grid, the analysis should be extended to include the ability of these loads to reduce frequency deviations. This paper performs a systematic review to evaluate the state-of-research on the potential of large-scale HE to reduce the rate-of-change-of-frequency and maximum frequency deviation. Current literature states a high potential of HE to counteract frequency deviation. Furthermore, various control approaches for delivering frequency ancillary services have been investigated. However, the paper identifies a research gap concerning applicability of the control approaches to large-scale HE considering resulting fluctuation in the flow rate of hydrogen production.