Method and wind turbine for damping low frequency oscillations in an electrical supply grid
AssigneeWobben Properties GmbH
InventorsJohannes Brombach, Aramis Schwanka Trevisan
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Abstract
Provided is a method for damping low frequency oscillations, in particular subsynchronous resonances, in an electrical supply grid by way of at least one decentralized production unit connected to the electrical supply grid, in particular a wind turbine or a wind farm, comprising the steps: feeding electrical power by way of the at least one production unit and supplementing the feeding by way of a supplementary component for damping the low frequency oscillations, wherein the supplementary component is determined depending on a simplified model of a synchronous machine.
Claims16
A method for damping low frequency oscillations in an electrical supply grid using at least one wind turbine or wind farm connected to the electrical supply grid, comprising:
- feeding, via a network connection point, electrical power by the at least one wind turbine or wind farm using an inverter having an inverter output;
- determining a supplementary component depending on a simplified model of a synchronous machine, wherein the simplified model is limited to emulating a subset of a plurality of properties;
- entering, into the simplified model, at least one instantaneous value of a voltage measurement at the inverter output, in the electrical supply grid or at a point between the inverter output and the electrical supply grid;
- and
- supplementing the feeding of the electrical power using the supplementary component for damping the low frequency oscillations,
- wherein
- the simplified model of the synchronous machine reproduces an oscillation damping property of a damper cage of the synchronous machine, and
- vibratory components of the synchronous machine on which the simplified model is based are not depicted or depicted having been attenuated.
A wind turbine or wind farm for feeding electrical power into an electrical supply grid and for damping low frequency oscillations in the electrical supply grid, comprising:
- an inverter having an inverter output configured to feed electrical power into the electrical supply grid;
- and
- a controller configured to:
- determine a supplementary component for damping the low frequency oscillations;
- generate a simplified model of a synchronous machine, wherein the simplified model is limited to emulating a subset of a plurality of properties;
- enter, into the simplified model, at least one instantaneous value of a voltage measurement at the inverter output, in the electrical supply grid or at a point between the inverter output and the electrical supply grid;
- and
- determine the supplementary component depending on the simplified model of the synchronous machine, and
- wherein the inverter is configured to additionally feed the supplementary component into the electrical supply grid to damp the low frequency oscillations, and
- wherein
- the simplified model of the synchronous machine reproduces an oscillation damping property of a damper cage of the synchronous machine, and
- vibratory components of the synchronous machine on which the simplified model is based are not depicted or depicted having been attenuated.
Dependencies are inferred from the claim text.