tax procedure and tax rate to attenuation of resonanzschwingungen a parallelschwingkreises for a pulswechselrichter a stromzwischenkreisumrichters.

摘要

The invention relates to a control method and a control device (12) for damping resonant oscillations in a parallel resonant circuit for a pulse invertor (6) of a current source converter, the pulse invertor (6) containing converter valves (V1,... V6) which can be switched off and being linked to an inductive and a capacitive load (8, 10), this inductive and capacitive load (8, 10) forming the parallel resonant circuit. According to the invention, by means of an operating frequency (f1) of a converter current (IR), a modulation mode is selected from a plurality of stored modulation modes and switching angles ( alpha 1, alpha 2, ..., alpha n) are determined as a function of a factor (f1/fres) which is formed and of the selected modulation mode, depending on the operating frequency, by means of stored, predetermined switching angle characteristics, with which switching angles the control times for the pulse invertor (6) are then generated. In this way, the pulse edges of a selected modulation mode can be adjusted as a function of frequency, with the operating frequency, as a result of which the resonant oscillations are sufficiently damped over the complete operating frequency range. …IMAGE…