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US 10,770,962 B2Granted
Converter cell comprising an energy converter in parallel to a clamp inductor
AssigneeABB Schweiz AG
InventorsAneeshkumar As, Kalpesh Bhalodi, Tomas Jonsson
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Abstract
A converter cell includes a first terminal; a second terminal; a plurality of switching elements provided with respective gate units; an energy storage element; an clamp inductor provided to restrict a rate of change of current from the energy storage element to the switching elements; and a first energy converter provided in parallel to the clamp inductor. The first energy converter is provided to power the gate units by utilising energy from the clamp inductor when the converter cell changes state to be in a short circuit state.
Claims20
A modular multilevel converter cell comprising:
- a first terminal;
- a second terminal;
- a plurality of switching elements provided with respective gate units;
- an energy storage element;
- a clamp inductor in a serial connection with the energy storage element,
- wherein the energy storage element is provided in parallel, via said clamp inductor, across a first leg of two switching elements, thereby the clamp inductor is configured to restrict a rate of change of current from the energy storage element to the switching elements;
- and
- a first energy converter in the form of a DC, direct current, to DC converter provided in parallel to the clamp inductor, the first energy converter being configured to power the gate units by utilising energy from the clamp inductor when the converter cell changes state to be in a short circuit state.
5 more elements
Dependencies are inferred from the claim text.