Research on modeling and a control scheme for synchronous condenser of flywheel energy storage system based on permanent magnet variable frequency speed regulation

To address the issue of insufficient grid inertia support caused by the large-scale integration of renewable energy， a synchronous condenser model of a flywheel energy storage system， along with a control scheme， is developed based on permanent magnet variable frequency speed regulation. This model integrates a flywheel energy storage system with permanent magnet variable frequency speed regulation on the rotor of the synchronous condenser. By utilizing the kinetic energy of the flywheel， the inertia power response capability of the synchronous condenser is enhanced without altering its grid connection method or rapid excitation capability. Both the electromagnetic and mechanical models of the permanent magnet speed-regulated motor and the synchronous condenser of the flywheel energy storage system are constructed. Additionally， a dual-channel coupled power output model that includes the synchronous condenser and the frequency converter is established. Based on this， the paper proposes a power control strategy for synchronous condenser frequency regulation of the flywheel energy storage system using permanent magnet variable frequency speed regulation. Simulations under typical application scenarios have verified the feasibility and effectiveness of this strategy.