Method and associated transmission system
AssigneeABB Technology AG
InventorsStefan Thorburn, Nicklas Johansson
Life of this patent
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Abstract
It is presented a method executed in a transmission system, the transmission system comprising an AC grid, a DC grid and at least two AC/DC converters connected between the AC grid and DC grid. The method comprises the steps of: obtaining set points for each one of the at least two AC/DC converters, each set point comprising a magnitude and direction of power through the respective AC/DC converter during normal operation generating, based on the set points, a virtual AC grid, the virtual AC grid corresponding to AC behavior of the DC grid, as viewed from each AC side of the at least two AC/DC converters; and controlling the at least two AC/DC converters to mimic a behavior in accordance with the virtual AC grid. A corresponding transmission system is also presented.
Claims20
A method executed in a transmission system, the transmission system comprising an AC grid, a DC grid and at least two AC/DC converters connected between the AC grid and DC grid, the method comprising the steps of:
- obtaining set points for each one of the at least two AC/DC converters, each set point comprising a magnitude and direction of power through the respective AC/DC converter during normal operation;
- obtaining measurements for each one of the at least two AC/DC converters;
- generating, based on the set points and the measurements, a virtual AC grid, the virtual AC grid corresponding to AC behaviour of the DC grid, as viewed from each AC side of the at least two AC/DC converters;
- and
- controlling the at least two AC/DC converters to mimic a behaviour in accordance with the virtual AC grid.
A transmission system comprising an AC grid, a DC grid, at least two AC/DC converters connected between the AC grid and DC grid, and a controller, the controller being arranged to:
- obtain set points for each one of the at least two AC/DC converters, each set point comprising a magnitude and direction of power through the respective AC/DC converter during normal operation;
- obtain measurements for each one of the at least two AC/DC converters;
- generate, based on the set points, a virtual AC grid, the virtual AC grid corresponding to AC behaviour of the DC grid, as viewed from each AC side of the at least two AC/DC converters;
- and
- control the at least two AC/DC converters to mimic a behaviour in accordance with the virtual AC grid.
Dependencies are inferred from the claim text.