Verfahren und Vorrichtung zur Bestimmung eines Grundschwingungsstrom-Raumzeigers eines gemessenen Ständerstrom-Raumzeigers.

摘要

The invention relates to a method and a device (14) for determining a fundamental current space vector (is1) of a measured stator current space vector (is) of a converter-supplied induction machine (2). According to the invention, a harmonic-model current actual vector is determined as a function of a control voltage vector (u<*>s1) and of a measured stator voltage space vector (us), which harmonic-model current actual vector is automatically adjusted in accordance with a harmonic current actual vector (iosw) as a function of a proportionality factor (k) which is calculated from the harmonic-model current actual vector and from a fundamental current space vector (is1). A fundamental current space vector (is1) of a measured stator current space vector (is) can thus be detected quickly, with a high frequency bandwidth, in converters having a low switching frequency.