Frequency Support and Speed Recovery Strategy of Grid-forming PMSGs Based on Inertia Synchronization
Focusing on the issue of secondary frequency drop induced by the switching between active power support and speed recovery after frequency response in wind turbines,a grid-forming wind turbine frequency support strategy considering speed recovery is proposed.Firstly,the"inertia synchronization"principle of grid-forming wind turbines is elucidated.Secondly,based on the rotor motion equation,the influence mechanism of frequency regulation and speed recovery strategy on the lowest frequency and secondary frequency drop of grid-forming wind turbines is analyzed.Finally,based on the PSCAD/EMTDC simulation platform,a grid-forming wind power system based on inertia synchronization is constructed,and the effectiveness of the proposed control strategy is verified under different disturbances.
grid-forming wind turbineinertia synchronizationspeed recovery strategyfrequency supportsecondary frequency drop
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