A HVRT Control Strategy for DFIG Considering Dynamic Changes of Stator Flux and Dynamic Reactive Power Compensation

In recent years, the proportion of wind power generation in the grid has become higher and higher. Doubly-fed induction generator (DFIG) has become the mainstream wind turbine of distributed wind farms. For DFIG, large rotor currents and DC bus voltages will be generated when the grid voltage swells. Without protection, the converter may be damaged. It is essential to enhance the fault ride through capability of DFIG and reduce the impact on the stable operation of power grid. Therefore, a high voltage ride-through (HVRT) control strategy considering dynamic reactive power compensation is investigated to address this problem. Firstly, the original control strategy is described. Secondly, variation of the stator flux is considered during the grid fault. Thirdly, the grid-side converter (GSC) and the rotor-side converter (RSC) output reactive current to provide reactive power compensation. Finally, simulation results analyses are conducted by MATLAB/Simulink to evaluate the effectiveness of the proposed strategy.