Applicability of SMES to Electric and Hydrogen Hybrid Energy Storage System for Large-Capacity Renewable Energy Generation

This study established a system configuration and operation control method of a Superconducting Magnetic Energy Storage (SMES) system that can achieve high fluctuation compensation in an electric and hydrogen hybrid energy storage system for large-scale renewable energy generation, aiming to expand the introduction of renewable energy. We first investigated the system configuration and operation control method effective for improving the fluctuation compensation performance of the SMES. As a result, we identified an effective system configuration in which the SMES and a capacitor are connected in parallel, and a bidirectional DC-DC converter is installed between the DC bus and the SMES system. Simulation results show that applying the proposed system configuration and operation control method can improve the DC bus voltage regulation ratio by an order of magnitude compared to a conventional SMES system. Furthermore, a SMES system for large-scale renewable energy generation was proposed in which the response and stored energy of the superconducting coils are improved by arranging them in parallel. Simulation results show that the SMES system with superconducting coils arranged in parallel can achieve high variability compensation for large-scale renewable energy generation and that the SMES is a promising power storage device in hybrid energy storage systems for large-capacity renewable energy generation.