US 11,757,284 B2
Method for attenuating low-frequency oscillations in an electrical power supply grid
Kai Busker, Großefehn (DE); and Kaveh Malekian Boroujeni, Bremen (DE)
Assigned to Wobben Properties GmbH, Aurich (DE)
Filed by Wobben Properties GmbH, Aurich (DE)
Filed on Oct. 19, 2022, as Appl. No. 17/969,460.
Claims priority of application No. 21203591 (EP), filed on Oct. 20, 2021.
Prior Publication US 2023/0122376 A1, Apr. 20, 2023
Int. Cl. H02J 3/24 (2006.01)
CPC H02J 3/241 (2020.01) [H02J 2300/28 (2020.01)] 16 Claims
OG exemplary drawing
 
1. A method comprising:
attenuating low-frequency oscillations in an electrical power supply grid by a feed device which feeds into the electrical power supply grid, wherein the electrical power supply grid has a grid voltage and a grid frequency, wherein the low-frequency oscillations are less than 5 hertz, the attenuating comprising:
detecting a grid signal having the low-frequency oscillations,
splitting a total frequency range of the grid signal in which oscillations to be attenuated are to be expected into a plurality of partial frequency ranges, each partial frequency range having a lower range frequency and an upper range frequency,
performing a frequency analysis of the grid signal for each partial frequency range to identify in each case one or more oscillations having an oscillation frequency in the partial frequency range, if present,
identifying a low-frequency oscillation to be attenuated as a target oscillation depending on the frequency analyses of all of the plurality of partial frequency ranges,
detecting the target oscillation at least according to frequency and amplitude,
determining a setpoint attenuation signal depending on the target oscillation detected according to frequency and amplitude for attenuating the detected target oscillation,
generating a setpoint feed signal depending on the setpoint attenuation signal and a basic setpoint signal, and
generating and feeding in a feed signal depending on the setpoint feed signal.