US 11,916,391 B2
Method for controlling a wind power installation
Christian Strafiel, Aurich (DE); Stefan Gertjegerdes, Aurich (DE); Aramis Schwanka Trevisan, Aurich (DE); and Ingo Mackensen, Aurich (DE)
Assigned to Wobben Properties GmbH, Aurich (DE)
Filed by Wobben Properties GmbH, Aurich (DE)
Filed on Dec. 11, 2020, as Appl. No. 17/119,414.
Claims priority of application No. 102019134458.1 (DE), filed on Dec. 16, 2019.
Prior Publication US 2021/0184469 A1, Jun. 17, 2021
Int. Cl. H02J 3/38 (2006.01); F03D 7/04 (2006.01); H02J 1/10 (2006.01); H02J 1/14 (2006.01); H02J 3/00 (2006.01); H02J 3/04 (2006.01); H02J 3/14 (2006.01); H02J 3/18 (2006.01)
CPC H02J 3/381 (2013.01) [F03D 7/048 (2013.01); H02J 1/106 (2020.01); H02J 1/14 (2013.01); H02J 3/007 (2020.01); H02J 3/04 (2013.01); H02J 3/14 (2013.01); H02J 3/1814 (2013.01); H02J 2300/28 (2020.01)] 16 Claims
OG exemplary drawing
 
1. A method for controlling a wind power installation or a wind farm including at least the wind power installation, comprising:
measuring, for a three-phase electrical system, a first voltage of a first phase, a second voltage of a second phase and a third voltage of a third phase;
determining, from the first, second and third measured voltages, a symmetrical negative-sequence voltage system including a first negative-sequence voltage, a second negative-sequence voltage, and a third negative-sequence voltage;
configuring, using a transformation and depending on the determined symmetrical negative-sequence voltage system, setpoints for a negative-sequence current system including a first negative-sequence system component for the first phase, a second negative-sequence system component for the second phase and a third negative-sequence system component for the third phase, wherein the setpoints are configured to balance the first, second and third voltages, configuring the setpoints including:
transforming the determined first, second and third negative-sequence voltages into respective dq coordinates using an amplitude-invariant dq transformation, wherein the first negative-sequence voltage is transformed into a first pair of amplitude-invariant dq coordinates, wherein each amplitude-invariant dq coordinate of the first pair of amplitude-invariant dq coordinates has the same amplitude as the first negative-sequence voltage and a phase angle that is modified based on the first negative-sequence voltage; and
transforming the respective dq coordinates into respective abc coordinates to produce the setpoints for the negative-sequence current system; and
feeding an asymmetrical three-phase AC current into a wind farm network or an electrical supply network depending on the configured setpoints.