A voltage regulation control strategy for grid-forming permanent magnet direct-drive wind turbines with energy storage configuration on the DC side

To address the issue of grid-configured wind turbines being unable to provide adequate voltage support during instances of grid voltage dips and reactive load fluctuations, a grid-configured permanent-magnet direct-driven wind turbine generators (DWTG) voltage regulation control strategy with energy storage on the DC side has been proposed. Firstly, a virtual synchronous generator (VSG) control strategy is adopted in the grid-side converter, which can provide reactive power support at the instant of grid voltage change. Secondly, by configuring the energy storage system on the DC side, the DC-side voltage is stabilized to the reference value rapidly when the grid voltage dips, and the machine-side converter is operated stably in the maximum power tracking mode. In tracking mode, the machine-side converter is stabilized in the maximum power tracking mode. In power tracking mode, the grid-side converter can generate additional power, thereby enabling the wind turbine to provide voltage support. Finally, the effectiveness of the strategy is verified by building a single-machine system and a four-machine and two-region system simulation through the MATLAB/Simulink platform.