Rapid Braking Control of Inertia Flywheel System Based on Converter Reactive Power Compensation

With the in-depth advancement of new-type power systems, conventional thermal power units are gradually decommissioned, which has increasingly exacerbated the problem of transient fluctuations in power grids; the novel inertia flywheel system increases the moment of inertia of the synchronous condenser rotor by coupling the flywheel rotor with a synchronous condenser, providing direct inertial support for power grids, and compared with power electronic converters, this system has significant advantages in terms of overload capacity and operational stability, boasting broad development prospects. However, after the integration of a large-scale flywheel rotor, when the system malfunctions or primary equipment is unavailable, the inertia flywheel system cannot achieve rapid and effective braking, and the substantial mechanical kinetic energy stored in its high inertia is difficult to dissipate quickly, posing a serious threat to the intrinsic safety of the system. To address this issue, this paper proposes a passive braking method based on converter reactive power compensation, which realizes the successful self-excitation of the flywheel motor and dissipates the energy of the flywheel system in the form of thermal energy through resistors, ensuring rapid braking of the system.