Stability analysis of an off-grid hybrid power plant for hydrogen production
A. Llamazares, S. Martín-Arroyo, A. Bestué Coarasa and M. García-Gracia Department of Electrical Engineering EINA, Zaragoza University, Campus Río Ebro, Zaragoza (Spain) 2026-02-15

Abstract

A 500 kW off-grid hybrid system based onrenewable energies (PV and Wind) is designed to produce green hydrogen. This energy system includes a Battery Energy Storage System (BESS) to improve the grid stability. To control the power plant two strategies are assessed. First, a variable-load control is applied to the electrolyser, while the BEES control (with hysteresis) ensures that the power is not less than the minimum admissible in the electrolyser. A second control is developed to minimize electrolyser degradation. In this case, the electrolyser operates at constant power, allowing only very slow voltage variations.

Key words: Off-grid hybrid system, grid stability, power plant control.

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