Load Demand Based Reactive Power Matching Control for High-Voltage Ride-Through of Doubly Fed Induction Generator

During the high-voltage ride-through (HVRT) process, to address the mismatching hazard between the point of common coupling (PCC) voltage swell and the reactive power generation from the doubly fed induction generator (DFIG), this paper proposes a load demand based reactive power matching (LDRPM) control, which contains three parts: 1) A transient voltage compensation control strategy for the rotor side converter (RSC) is constructed to mitigates rotor overcurrent through the transient stator voltage feedforward compensation term; 2) A rotor power injection control strategy in the grid side converter (GSC) is designed to suppress DC link overvoltage by considering the external imbalance power; 3) An adaptive droop allocation control strategy is presented to ensure sufficient inductive reactive power. The static characteristics of the external load is used to deduce the droop reactive power of the adaptive droop allocation control, and the reactive power allocation between RSC and GSC is realized by the reactive power allocation factor, which is constructed by the stator and GSC reactive current upper bounds. Simulation results demonstrate that the proposed control strategy effectively suppresses the rotor overcurrent and the DC link overvoltage when supplying sufficient reactive power support.