“…There have been thus far various design and control methods developed for flywheel energy storage systems, such as the neutral-point potential control Li Z. et al (2022), active disturbance rejection Chang et al (2015); Ghanaatian and Lotfifard (2019), wide speed range operation Zhang and Yang (2017), DC-link voltage control Zhang and Yang (2018); Gong et al (2020), robust control Zhang et al (2021); Liang et al (2022), and learning based intelligent control He et al (2022); Yin and Li (2022), just to name a few. On the other hand, flywheels have recently found applications in many new areas, such as energy management for railways Canova et al (2022); Li J. et al (2022), offshore wind farm power transmission Daoud et al (2016); Tomczewski et al (2019), vehicle energy harvesting Ahamad et al (2019); Thormann et al (2021), and so on.…”