Research on Control Strategy of High-Speed Grid-Connected FESS (Flywheel Energy Storage System) Based on Dual-PWM Converter

• Published in: Tehnički vjesnik Vol. 31; no. 1; pp. 178 - 184
• Main Authors: Bu, Wenping, Ding, Zhilin, Feng, Shuling, Cai, Xing, Zhang, Yunfang, Yu, Xiao, Huang, Wenhao
• Format: Journal Article Paper
• Language: English
• Published: Slavonski Baod University of Osijek 01.01.2024; Josipa Jurja Strossmayer University of Osijek; Strojarski fakultet u Slavonskom Brodu; Fakultet elektrotehnike, računarstva i informacijskih tehnologija Osijek; Građevinski i arhitektonski fakultet Osijek; Faculty of Mechanical Engineering in Slavonski Brod, Faculty of Electrical Engineering in Osijek, Faculty of Civil Engineering in Osijek
• Subjects: Analysis; Charging; Closed loops; Control methods; Control systems; D C motors; Design; dual-PWM converter; Electric current converters; Electric potential; Electric power grids; Energy industry; Energy management systems; Energy storage; Feedback control; Flywheels; grid-connected control; High speed; high-speed FESS; Power flow; Storage capacity; two-stage control; Voltage; China
• ISSN: 1330-3651; 1848-6339
• DOI: 10.17559/TV-20230803000849

FESS (flywheel energy storage system) motor is used in important load fields for instance rail transit; meanwhile the power flow is formed through the connection between FESS (flywheel energy storage system) and power grid system, which can critically improve the power flow fluctuation caused by new energy grid integration regarding wind and photovoltaic generation concerning that the motor speed in FESS is related to its energy storage capacity. Aiming at the limitation of current low motor speed in the FESS, this article puts forward a high-speed grid-connected FESS, and designs a model via the proposed dual-PWM two-stage control form, which is named as double closed-loop control. In this article, the FESS, as well as the power grid system, is analyzed and simulated in three stages: charging, pre-grid connection and grid connection. In this way, the flywheel motor speed and DC bus voltage signal are sampled to design the flywheel motor side with the proposed method. Then the grid-connected double closed-loop control method is designed for the sampling observation points, which realizes the efficient design on the control strategy of proposed high-speed grid-connected FESS and the verification of voltage and current parameters. The simulation experiments show that the operation process of the grid-connected FESS motor obtains its rapid speed response characteristic, which can meet the proposed design requirements during the charging and discharging process.