H - Electricity – 02 – M
Patent
H - Electricity
02
M
321/97
H02M 1/084 (2006.01) H02M 1/12 (2006.01) H02M 5/45 (2006.01) H02M 7/5387 (2006.01)
Patent
CA 2035730
ABSTRACT OF THE DISCLOSURE A control process and trigger equipment damps resonant oscillations of a parallel-resonant circuit for a pulse-controlled inverter of a current-source inverter. The pulse-controlled inverter contains turn- off current-converter switches and is linked to an inductive and to a capacitive load. This inductive and capacitive load forms a parallel-resonant circuit. A modulation mode is selected from several stored modulation modes from the system frequency (f1) of the converter current (IR). Depending upon a calculated factor (f1/fres) and the selected modulation mode, switching angles (.alpha.1, .alpha.2, ..., .alpha.n) are determined depending upon system frequency by means of stored, pre- set switching angles. From these switching angles the control times for the pulse-controlled inverter are then generated. Thus, the pulse edges of a selected modulation mode can be adjusted with the system frequency as a function of frequency, enabling the resonant oscillations to be adequately damped over the entire system frequency range.
Aktiengesellschaft Siemens
Fetherstonhaugh & Co.
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