Patent ID: 6198256
Filing Date: 2001-03-06
Classification: B60K,B60L,B60W,H02P,Y02T,Y10S

Abstract:
A control method for a synchronous generator system, in which A.C. electric power produced by a synchronous generator is converted by a converter into D.C. electric power, comprising the steps of:generating voltage instructions (V.sub.u *, V.sub.v *, V.sub.w *) based on a reference (P*) for a power to be produced by the synchronous generator, currents (I.sub.u, I.sub.v) flowing through the synchronous generator and information (.theta..sub.0, .omega..sub.r) concerning a position of magnetic poles of the synchronous generator through a voltage instruction generator; the converter being operated in accordance with the thus generated voltage instructions (V.sub.u *, V.sub.v *, V.sub.w *);detecting a zero crossing point, at which the voltage (V.sub.u, V.sub.v, V.sub.w) of the synchronous generator passes through a zero level of voltage through a zero crossing point detector; andcalculating the information (.theta..sub.0, .omega..sub.r) concerning the position of magnetic poles of the synchronous generator through a magnetic pole position calculator on the basis of at least one of the voltage instructions (V.sub.u *, V.sub.v *, V.sub.w *) and the power reference (P*) when the synchronous generator is under the generation mode, and on the basis of an output signal of an output signal of the zero crossing point detector when the synchronous generator is under the stand-by mode.