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AssigneeGE Energy Power Conversion Technology Limited
InventorsThomas Brueckner, Michael Bernhard Kocur, Peter Nadolny
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A premagnetization device is disclosed for a converter system connectable to a three-phase electrical grid that has a three-phase power transformer, a converter connected to the power transformer and a circuit-breaker on the grid side of the power transformer. The premagnetization device is configured to suitably premagnetize the power transformer in a state isolated from the grid. The premagnetization device uses a single-phase reference voltage (Uref) that has a fixed relationship to the grid voltage (Ugrid) with regard to the voltage parameters, in order to generate, based on the measured instantaneous reference voltage (Uref) and the known fixed parameter relationships, by actuating the converter, a three-phase alternating voltage synchronous to the grid voltage (Ugrid) on the grid side of the power transformer. A converter system and a method for premagnetizing a three-phase power transformer of a converter system are also disclosed.
A premagnetization device for a converter system that can be connected to a three-phase electrical grid that has a three-phase power transformer with a primary side that can be connected to the grid and a converter connected to the secondary side of the power transformer, wherein the premagnetization device, when the primary side is isolated from the grid, is configured to premagnetize the power transformer via the converter such that a voltage on the primary side of the power transformer is essentially synchronous to a grid voltage (Ugrid) of the grid, wherein the premagnetization device is connected to a single-phase reference voltage (Uref) that has a fixed relationship to the grid voltage (Ugrid) in terms of frequency, amplitude and phase, and comprises means for detecting the reference voltage (Uref), and the premagnetization device is configured to premagnetize the power transformer via the converter based on the instantaneous detected reference voltage (Uref) and the known relationships between the reference voltage (Uref) and the grid voltage (Ugrid).
A method of premagnetization of a three-phase power transformer of a converter system having a converter that is connected to the secondary side of the power transformer whose primary side can be connected to an electrical grid, wherein the method comprises:
Dependencies are inferred from the claim text.