PROCEDURE FOR REGULATING THE D.C. VOLTAGE OF A RECTIFIER

摘要

Procedure for regulating the d.c. voltage of a pulse-width modulated rectifier bridge controlled by selfcommutated semiconductor components and provided with filtering coils, in which procedure the phase voltages of the supplying three-phase mains and the d.c. voltage of the rectifier are measured. The modulation references needed for the pulse-width modulation are produced using pure sine and cosine curves synchronized with the mains voltages, with spatial vectors formed from them or with components of such vectors, by means of a phase-locked loop. The regulation is effected in a coordinate system tied to the spatial vector of the mains voltages.