A device, a system, and a method for preventing power-producing wind
turbine generators from tripping due to the detection of a low-voltage
condition on a power grid are disclosed. The disclosed device includes a
resistor bank that absorbs real power and a control system that maintains
the collector bus voltage above a threshold voltage level during the
duration of low-voltage condition on the power grid. Collector bus
voltage is maintained using gating signals that include phase delay
angles to adjust the opening/closing of the switching devices.