# US 11,994,107 B2 · Oscillation damping in wind power installations > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,994,107 B2 - Document ID: US11994107B2 - Status: Granted - Kind: B2 - Application number: 17/398,774 - Filed: 2021-08-10 - Published: 2022-02-17 - Granted: 2024-05-28 - Earliest claimed: 2020-08-14 - Assignees: Wobben Properties GmbH - Applicants: Wobben Properties GmbH - Inventors: Eckard Quitmann; Sönke Engelken - Web page: https://patentgrep.com/patent/US11994107B2 ## CPC - F03D 7/0284: {in relation to the state of the electric grid} - H02J 3/00142: {Oscillations concerning frequency} - F03D 7/0272: {by measures acting on the electrical generator} - F03D 7/048: {controlling wind farms} - F03D 9/257: {the wind motor being part of a wind farm} - H02J 3/381: {Dispersed generators} - F05B 2270/1033: Power (if explicitly mentioned) - F05B 2270/337: Electrical grid status parameters, e.g. voltage, frequency or power demand - H02J 2101/28: Wind energy - Y02E 10/72: Wind turbines with rotation axis in wind direction - Y02E 10/76: Power conversion electric or electronic aspects - F03D: WIND MOTORS - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - F05B: INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract Provided is a control unit for a converter, in particular of a wind power installation and/or of a wind farm, comprising: an input for receiving a detected voltage and/or a detected current, an input for receiving a voltage set point and/or a current set point, an input for receiving a correction value and a feedback control system which is set up, depending on the detected voltage and/or the detected current and the voltage set point and/or the current set point and the correction value, to produce a reactive power set point for a modulated, preferably amplitude-modulated reactive and/or active power of the converter. ## Claims ### Claim 1 A controller for a converter, comprising: a first input configured to receive a detected voltage value and/or a detected current value; and a second input configured to receive a voltage set point and/or a current set point, wherein the controller is configured to: perform filtering on a potentially critical electrical frequency, wherein the potentially critical electrical frequency is a frequency to be dampened; determine a correction value based on filtering on the potentially critical electrical frequency; and determine a reactive power set point influencing a modulated reactive and/or modulated active power of the converter depending on the detected voltage value and/or the detected current value, the voltage set point and/or the current set point and the correction value. ### Claim 2 (depends on 1) The controller as claimed in claim 1, wherein the controller is configured to be implemented within a wind power installation or a wind farm. ### Claim 3 (depends on 1) The controller as claimed in claim 1, wherein the modulated reactive and/or the modulated active power of the converter is an amplitude-modulated reactive and/or an amplitude-modulated active power of the converter. ### Claim 4 (depends on 1) The controller as claimed in claim 1, wherein: the correction value includes at least one control value; or the at least one control value is formed from the correction value. ### Claim 5 (depends on 1) The controller as claimed in claim 1, wherein the controller is configured to determine the correction value based on the detected voltage value and/or the detected current value that enables an identification of a critical electrical frequency. ### Claim 6 (depends on 1) The controller as claimed in claim 1, wherein: performing the filtering includes applying a Kalman filter to determine a problem vector from the potentially critical electrical frequency, and the controller is configured to perform phase correction to correct a vector of critical electrical frequencies and to obtain a phase-corrected vector that forms a basis for the correction value. ### Claim 7 (depends on 1) The controller as claimed in claim 1, wherein the controller is configured to: perform the filtering in αβ coordinates; and identify a critical electrical frequency in response to a problem vector exceeding at least one amplitude response threshold. ### Claim 8 (depends on 1) The controller as claimed in claim 1, wherein the controller is configured to: identify, from a plurality of electrical frequencies, the potentially critical electrical frequency. ### Claim 9 (depends on 8) The controller as claimed in claim 8, wherein the potentially critical electrical frequency indicates a network oscillation in an electrical supply network. ### Claim 10 (depends on 8) The controller as claimed in claim 8, wherein the controller is configured to operate in one of at least two different modes in order to identify the potentially critical electrical frequency. ### Claim 11 A method for controlling a converter, comprising: detecting at least one voltage and/or at least one current; receiving a voltage set point and/or a current set point; performing filtering on a potentially critical electrical frequency, wherein the potentially critical electrical frequency is a frequency to be dampened; determining a correction value based on filtering on the potentially critical electrical frequency; determining a reactive power set point influencing a modulated reactive and/or a modulated active power of the converter depending on the detected at least one voltage value and/or the detected at least one current value, the voltage set point and/or the current set point and the correction value; and exchanging the modulated reactive power with an electrical supply network to dampen or counteract a network oscillation. ### Claim 12 (depends on 11) The method as claimed in claim 11, wherein the converter is configured to be implemented within a wind power installation and/or a wind farm. ### Claim 13 A method for controlling an electrical supply network, comprising: receiving, by a controller, a frequency or a frequency range that is set by a network operator; performing filtering on a potentially critical electrical frequency, wherein the potentially critical electrical frequency is a frequency to be dampened; determining a correction value based on filtering on the potentially critical electrical frequency; determining, by the controller, whether vibrations of a network oscillation occur within the frequency or the frequency range; and in response to determining that the vibrations of the network oscillation occur within the frequency or the frequency range, controlling reactive power in the electrical supply network to dampen the vibrations. ### Claim 14 (depends on 13) The method as claimed in claim 13, wherein controlling the reactive power includes: detecting at least one voltage and/or at least one current; receiving a voltage set point and/or a current set point; and determining, by a controller of at least one wind power installation or a wind farm, a reactive power set point influencing the reactive and/or an active power depending on the detected at least one voltage value and/or the detected at least one current value, the voltage set point and/or the current set point and the correction value.