Comparative Study of Grid Frequency Stability Using Flywheel-Based Variable-Speed Drive and Energy Capacitor System

Recently, there has been a rise in the integration of renewable energy sources into power grids. As result this, is need to carry out new studies order understand dynamics grids during disturbances that mainly caused by stochastic nature wind energy. The operation modern are tied farms follows stipulated grid requirement or codes, considering allowable threshold frequency variation dynamics. This paper presents comparative study two control schemes stability using topologies. A novel dynamic flywheel scheme with doubly fed induction generator (DFIG) variable-speed turbine coordinated excess kinetic and mechanical torque was first scheme, strategy an capacitor system (ECS) squirrel cage fixed-speed (FSWT) second scheme. salient part this DFIG maximum point tracking for effective smoothing output designed based on its reference achieve at terminals generator. model employed work farm conventional made steam hydro synchronous turbines. For fair comparison results, same natural speed used PSCAD/EMTDC both schemes. When no control, Scheme 1, 2 were implemented, dips 47.20, 49.99, 49.99 Hz overshoots 50.500, 50.005, 50.001 recovery times over 600.00, 0.01, 0.01 s, respectively, variable.