G - Physics – 05 – F
Patent
G - Physics
05
F
G05F 1/70 (2006.01) H02H 7/10 (2006.01) H02J 3/18 (2006.01)
Patent
CA 2096319
Abstract of the Disclosure A method and apparatus is described for generating a synchronizing signal for a firing-circuit subassembly to trigger a power converter valve of a controlled series compensator. According to the invention, a sinusoidal substitute variable is provided, which can be either a measured line current or the sum of a capacitor current and a valve current, such that the zero crossings of said substitute variable do not vary. This substitute variable is modified in terms of its phase position so that a synchronizing signal that corresponds to the phase position of the capacitor voltage of the series capacitor of the controlled series compensator is made available to the firing-circuit subassembly. The result, even in the bypassed state, is a sinusoidal synchronizing signal whose zero crossings do not vary, so that operating stability problems no longer occur in the transient state during operation close to resonance.
Leowald Karl-Friedrich
Weiss Stephan
Aktiengesellschaft Siemens
Fetherstonhaugh & Co.
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