Loading of generators by switchmode power supplies, 3-phase rectifiers, gaseous-discharge lamp fixtures, and other nonlinear loads produces voltage distortion and possible excitation system instability. The voltage distortion is measured by total harmonic distortion (THD), which can reach values as high as 25 percent. The usual method of control is to derate the generator for nonlinear load. Typical standby generators emplq salient-pole rotors with incomplete damper windings, that is, damper windings only in the direct axis. Previously published experimental work has shown that non-salient pole rotors with complete damper windings reduce the voltage distortion under rectifier load. Manufacturers have not offered generators for low distortion operation, but have generally recommended derating. We will examine analytically the impact of reducing saliency in the rotor construction and in the damper windings on the impedance of the generator to harmonic currents.
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