Simulation and Field Verification of High Voltage Ride Through Capability of Doubly-fed Induction Generator in Weak Grid

Abstract

To improve the adaptability of a doubly-fed induction generator (DFIG) in a weak grid, this paper applies the high voltage ride-through (HVRT) control strategy based on realistic model data. The DFIG's rotor-side converter (RSC) uses current loop control to decouple active and reactive power, enabling the DFIG's variable speed and constant frequency functions. The grid-side converter (GSC) employs dual closed-loop voltage-current control to stabilize the DC bus voltage, control the reactive power output, and operate the turbine at the unit power factor. The MATLAB simulation shows that the control strategy of the whole machine enables the DFIG to operate stably and to achieve HVRT when the grid voltage rises within 1.3 pu. Moreover, by optimizing the fan control parameters, the measured data matches the simulation results.