Enhancing Renewable Energy Systems: Integrating and Optimizing Flywheel and Hydrogen-Based Energy Storage Solutions

Abstract The transition to renewable energy sources such as solar and wind is challenged by their variable outputs, which can lead to power imbalances. Hydrogen fuel cells, typically used for long-term energy storage, encounter challenges such as degradation due to power fluctuations and slow response times. This study proposes a hybrid energy storage solution that integrates flywheels and fuel cells to address these issues. Flywheels provide a rapid response to power peaks, whereas fuel cells offer stable, continuous power during periods of low renewable energy production. The hybrid system comprises a solar PV array, a PEM electrolyzer, a flywheel storage system, a PEM fuel cell, and hydrogen tanks, all coordinated by a power management unit (PMU) through a common DC link to ensure efficient power distribution. A sizing optimization model is employed to balance energy supply and demand, thereby optimizing the component sizes. Efficiency analyses indicate that this hybrid system could significantly improve the stability and reliability of renewable energy sources, presenting a robust solution to the challenge of power intermittency by effectively managing both short-term and long-term energy storage needs.