Impact of droop control strategies on the stability of isolated power systems with hydrogen energy storage integration

Impact of droop control strategies on the stability of isolated power systems with hydrogen energy storage integration .
The increasing penetration of renewable energy sources (RES) into isolated power systems introduces significant challenges to frequency and voltage stability due to the lack of rotational inertia. Hydrogen energy storage systems (HESS) offer a promising solution not only for short-term balancing but also for seasonal energy shifting, yet their dynamic interaction with grid-forming inverters remains underexplored. This study addresses the critical need for robust control strategies that ensure stable operation of hybrid RES-HESS microgrids under various network conditions and fault scenarios.
This paper aims to evaluate the effectiveness of three droop-based control strategies – conventional droop, inverse droop, and a combined method with synthetic inertia – for isolated power systems incorporating HESS. The hypothesis is that the combined synthetic inertia approach provides superior dynamic performance and stability margins, particularly when HESS is used for seasonal energy storage, while adaptive tuning is essential for accommodating the asymmetric response of electrolyzers and fuel cells.
A mathematical model of an isolated microgrid comprising RES, HESS (electrolyzer, hydrogen storage, and fuel cell), and power converters was developed in MATLAB/Simulink and PSAT. The control algorithms were implemented and tested under normal operations, load steps, inverter plug-in/outage, and fault conditions. Key performance indicators included settling time, frequency nadir, voltage deviation, and eigenvalue-based small-signal stability analysis.
The conventional droop control ensures stable operation but requires careful tuning and suffers from reactive power sharing errors in resistive networks. Inverse droop improves decoupling in low-voltage grids but exhibits slower transient responses. The combined method with synthetic inertia demonstrates the best performance, achieving active power redistribution within 0.7 seconds and maintaining frequency within permissible limits (49.84–50.25 Hz) under severe disturbances. Furthermore, it is shown that HESS can effectively absorb summer solar surplus for winter discharge, with droop control ensuring smooth power transitions and preventing overloads.
The integration of HESS with advanced droop control strategies significantly enhances the stability and reliability of isolated power systems. The combined method with synthetic inertia is recommended for hybrid electro-hydrogen complexes, provided that adaptive, real-time coefficient adjustments are implemented. For Russia, this approach offers a strategic pathway to energy sovereignty in remote and isolated territories, leveraging hydrogen as a seasonal energy carrier and stabilizing seasonal imbalances between summer solar generation and winter demand.

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