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US 11,424,612 B2Granted
Method and apparatus for over voltage protection of a power system
AssigneeGE Aviation Systems LLC
InventorsHao Huang, David Dimitri Karipides, Roger Dean Thornton
Life of this patent
Estimating the term…
Abstract
A method and apparatus for operating an overvoltage response for an electric machine includes opening a first switching element and a second switching element in response to an overvoltage condition. In the instance that the overvoltage condition persists, the method and apparatus can further open a third switchable element to cease the overvoltage condition.
Claims20
An overvoltage response module for an electric machine, comprising:
- an input configured to receive a voltage output value of the electric machine;
- a first output configured to drive a first switchable element at a first leg of an H bridge and a second output configured to drive a second switchable element at a second leg of the H bridge, the H bridge further including an exciter stator of the electric machine disposed between the first leg and the second leg;
- a third output configured to drive a third switchable element upstream of the H bridge;
- a controller module configured to compare the voltage output value with an overvoltage condition of the electric machine, defining a first comparison, and in response to a determination an overvoltage condition exists based on the first comparison:
- controllably operate the first switchable element to open, by way of the first output, and the second switchable element to open, by way of the second output, and after a predetermined period of time, compare the voltage output value with the overvoltage condition of the electric machine, defining a second comparison;
- and
- in response to a determination the overvoltage condition exists based on the second comparison, controllably operate the third switchable element to open.
4 more elements
A method of operating an overvoltage response in a power system, the method comprising:
- receiving a first value representative of a voltage output of an electric machine;
- a first comparing of the first value with an overvoltage threshold value representative of an overvoltage condition in the electric machine;
- in response to determining an overvoltage condition exists based on the first comparison, controllably opening a first switchable element at a first leg of an H bridge and controllably opening a second switchable element at a second leg of the H bridge, the H bridge further including an exciter stator of the electric machine disposed between the first leg and the second leg;
- after a predetermined period of time sufficient to cease current conduction in the exciter stator, receiving an updated value representative of the voltage output of the electric machine;
- and
- a second comparing of the updated value with the overvoltage threshold value representative of the overvoltage condition in the electric machine to ensure the overvoltage condition has ceased.
3 more elements
An electric machine assembly, comprising:
- a voltage output having a sensor configured to sense the voltage output;
- a Stator assembly including an H bridge circuit defining a first leg and a second leg, and having an exciter stator disposed between the first leg and the second leg;
- a first switchable element disposed in the first leg;
- a second switchable element disposed in the second leg;
- a third switchable element disposed upstream of the H bridge circuit;
- a controller module connected with the sensor and configured to compare a sensed voltage output by the sensor with an overvoltage condition of the electric machine, defining a first comparison, and in response to a determination an overvoltage condition exists based on the first comparison:
- controllably operate the first switchable element to open and the second switchable element to open, and after a predetermined period of time, compare an updated sensed voltage output by the sensor with the overvoltage condition of the electric machine assembly, defining a second comparison;
- and in response to a determination the overvoltage condition exists based on the second comparison, controllably operate the third switchable element to open.
5 more elements
Dependencies are inferred from the claim text.