Patent ID: 7746038

Claim:
A controller for use in a synchronous generator that includes an exciter field winding, an exciter armature winding, a main field winding and a main armature winding, the controller comprising: a first input-operably connected to monitor output voltages of the generator; a voltage calculator operably connected to the first input for calculating an average voltage value based on the monitored output voltages; a control loop operably connected to the voltage calculator for generating a compensated signal based on the average voltage value, wherein in response to an unbalanced short-circuit condition the control loop identifies and modifies a voltage ripple component within the average voltage value to generate a compensated signal; and an output operably connected to control excitation provided to the exciter field winding based on the compensated signal provided to the control loop, wherein the compensated signal counteracts armature reaction voltage ripples generated as a result of an unbalanced short-circuit fault.