On Decreasing the Stator Winding Phase EMF Waveform Distortion Factorand Additional Iron Losses in the Stator of a Salient Pole Synchronous Generator
The article considers topical matters of ensuring asinusoidal shape of the line-to-line voltage waveform, which arise in designing salientpole synchronous generators, machines that are widely used in power systems. Asiswell known, the use of magnetic wedges in the generator stators lotsmakes it possible to improve the machine’s basic electrical characteristics; to decrease the influence of higher harmonic components; to decrease additional losses, the torques produced by the magnetic field higher harmonic components, noise and vibration; to decrease the winding temperature and the stator active steel temperature, and to increase the efficiency. The effect the magnetic properties of wedge material in the stator slots have on the nonlinear distortion factor isinvestigated using the ELCUT applied computation software package. It hasbe en determined that the relative permeance value has an essential effect on the stator winding phase EMF waveform distortion factor and on the additional loss in the stator iron. The optimal wedge material permeance value swith which the generator EMF waveform complies with the requirements of the relevant Russian state standard (GOST) have been selected.