Method For Operating Electric Power Converter And Electric Power Converter
AssigneeABB Schweiz AG
InventorsTeemu Salmia, Markus Vilkki, Timo Kantola
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Abstract
A method for operating an electric power converter, and an electric power converter including a plurality of controllable power semiconductor switches and configured to operate in a grid-forming mode of operation such that the controllable power semiconductor switches are operated at a first switching frequency, and in response to detecting a short-circuit fault in an AC network connected to the electric power converter provide an AC current of at least a predetermined magnitude to the AC network such that the controllable power semiconductor switches are operated at a second switching frequency, wherein the second switching frequency is lower than the first switching frequency.
Claims16
A method for operating an electric power converter, the electric power converter comprising a plurality of controllable power semiconductor switches and an AC output with one or more phases, the method comprising:
- operating the electric power converter in a grid-forming mode of operation including controlling the plurality of controllable power semiconductor switches to provide and sustain an AC voltage of a predetermined magnitude and a predetermined frequency at an AC network connected to the AC output of the electric power converter such that the controllable power semiconductor switches are operated at a first switching frequency;
- detecting a short-circuit fault in the AC network connected to the AC output of the electric power converter during the operating of the electric power converter in the grid-forming mode of operation;
- and
- in response to the detecting of the short-circuit fault, controlling the plurality of controllable power semiconductor switches to provide an AC current of at least a predetermined magnitude to the AC network connected to the AC output of the electric power converter such that the controllable power semiconductor switches are operated at a second switching frequency, wherein the second switching frequency is lower than the first switching frequency.
A computer readable medium storing program instructions for causing a computing apparatus controlling an electric power converter to carry out the following:
- operate the electric power converter in a grid-forming mode of operation including controlling the plurality of controllable power semiconductor switches to provide and sustain an AC voltage of a predetermined magnitude and a predetermined frequency at an AC network connected to the AC output of the electric power converter such that the controllable power semiconductor switches are operated at a first switching frequency;
- detect a short-circuit fault in the AC network connected to the AC output of the electric power converter during the operating of the electric power converter in the grid-forming mode of operation;
- and
- in response to the detecting of the short-circuit fault, control the plurality of controllable power semiconductor switches to provide an AC current of at least a predetermined magnitude to the AC network connected to the AC output of the electric power converter such that the controllable power semiconductor switches are operated at a second switching frequency, wherein the second switching frequency is lower than the first switching frequency.
An electric power converter, the electric power converter comprising:
- a plurality of controllable power semiconductor switches;
- an AC output with one or more phases;
- a control arrangement configured to:
- operate the electric power converter in a grid-forming mode of operation including controlling the plurality of controllable power semiconductor switches to provide and sustain an AC voltage of a predetermined magnitude and a predetermined frequency at an AC network connected to the AC output of the electric power converter such that the controllable power semiconductor switches are operated at a first switching frequency;
- detect a short-circuit fault in the AC network connected to the AC output of the electric power converter during the operating of the electric power converter in the grid-forming mode of operation;
- and
- in response to the detecting of the short-circuit fault, control the plurality of controllable power semiconductor switches to provide an AC current of at least a predetermined magnitude to the AC network connected to the AC output of the electric power converter such that the controllable power semiconductor switches are operated at a second switching frequency, wherein the second switching frequency is lower than the first switching frequency.
A control system for an electric power converter, which electric power converter comprises a plurality of controllable power semiconductor switches and an AC output with one or more phases, the control system including a processor, and a memory storing instructions that, when executed by the processor, cause the processor to:
- control the electric power converter to operate in a grid-forming mode of operation, including controlling the plurality of controllable power semiconductor switches to provide and sustain an AC voltage of a predetermined magnitude and a predetermined frequency at an AC network connected to the AC output of the electric power converter such that the controllable power semiconductor switches are operated at a first switching frequency;
- detect a short-circuit fault in the AC network connected to the AC output of the electric power converter during the operating of the electric power converter in the grid-forming mode of operation;
- and
- in response to the detecting of the short-circuit fault, control the plurality of controllable power semiconductor switches to provide an AC current of at least a predetermined magnitude to the AC network connected to the AC output of the electric power converter such that the controllable power semiconductor switches are operated at a second switching frequency, wherein the second switching frequency is lower than the first switching frequency.
Dependencies are inferred from the claim text.