Abstract
More and more large-scale wind farms are interfaced into the power grid to achieve sustainable development and environmental protection, and the penetration rate of wind power generation in the power system is increasing. To improve the frequency support ability of wind turbines (WTs) and weaken the adverse effect of phase locked loop, virtual synchronous generator (VSG) control of WTs is in the ascendant. However, the VSG-controlled doubly-fed induction generator (DFIG) based wind farm does not have sufficient capability to ride-through grid faults such as voltage drops. In this paper, a model predictive control-based VSG control for DFIG is proposed, which can limit the current surge and accelerate the decay of the transient flux component under symmetrical voltage faults and suppress the transient and negative sequence rotor current components under asymmetrical voltage faults. At the same time, a calculation method of power reference values of DFIGs and battery energy storage system under voltage faults is proposed, which can reduce the decline of wind farm output active power while providing the required reactive current to the power grid. Finally, simulation and experimental results verify that the proposed control strategy is effective in enhancing the low-voltage ride through capability of DFIG-Based wind farms.
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