Abstract:
Grid rules require wind turbines to survive a grid voltage unbalance without tripping. Existing controls for brushless doubly-fed induction generator (BDFIG)-based wind turbines under grid unbalance have various issues, including decoupling control, flux or current estimations, and complex control structures.
Furthermore, earlier research solely addressed machine side converter (MSC) control, not coordinated MSC-grid side converter (GSC) control or BDFIG wind turbine system control objectives. This work presents a coordinated MSC-GSC control technique to solve these issues and improve control.
Determine the increased control objectives for the BDFIG wind turbine system first. Second, MSC and GSC have simple single-current closed-loop controllers without flux or current calculations. All disturbances and cross-coupling terms on dq axes are generated and employed for feedforward control in current loops to decouple and improve system dynamic response.
To improve system control, quick sequence decomposition is used. Finally, 2 MW BDFIG-based wind generation system case studies confirm the suggested control. The findings show that the suggested control may meet wind turbine system control objectives under grid voltage unbalance and perform well dynamically and stablely.
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