Method and device for correcting of distortions in the magnetization current of a transformer, which with a self-commutated converter is linked with disconnectable power semiconductor switches

摘要

the invention relates to a method for ausregelung distortions in magnetisierungsstrom a transformer (4), on the one hand, with a load or a network (6) and, on the other hand, with a selbstgefu00fchrten converters (8) with abschaltbarem leistungshalbleiterschalter is associated.erfindungsgemu00e4u00df is measured wicklungsstrom (ir, is, it) in areas (a1, a3) with lienaren distortions and in areas (a2, a4) without distortion, and the corresponding divided stromzeitflu00e4chen calculated, from which a magnetisierungsunsymmetrie (ir =, =, =) we d, through a comparison with a reference value $i1 a statistic (tr, ts, tt),with the help of the schaltzeitpunkte the control signals (s) of the stromrichters (8) as long as time be delayed until the value of the magnetisierungsunsymmetrie (ir =, =, =) is equal to the target value.thus one can with a strommeu00dfwert (ir, is, it), irrespective of an offset error (iof) by means of a calculated hauptfeldspannung (clock, uhs, uht) non-linear distortions of a stromrichtergespeisten transformer (4) ausregeln.