US 11,841,005 B2
Damping of in-plane vibrations in multi-rotor structures
Julio Xavier Vianna Neto, Aarhus N (DK); Søren Dalsgaard, Hadsten (DK); Ian Couchman, Horley (GB); and Jon Sowman, Aarhus N (DK)
Assigned to VESTAS WIND SYSTEMS A/S, Aarhus N (DK)
Appl. No. 17/758,653
Filed by VESTAS WIND SYSTEMS A/S, Aarhus N. (DK)
PCT Filed Jan. 12, 2021, PCT No. PCT/DK2021/050007
§ 371(c)(1), (2) Date Jul. 12, 2022,
PCT Pub. No. WO2021/143990, PCT Pub. Date Jul. 22, 2021.
Claims priority of application No. 2020 70026 (DK), filed on Jan. 13, 2020.
Prior Publication US 2023/0035973 A1, Feb. 2, 2023
Int. Cl. F03D 7/02 (2006.01); F03D 1/02 (2006.01)
CPC F03D 7/0296 (2013.01) [F03D 1/02 (2013.01); F03D 7/0224 (2013.01); F05B 2270/807 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A multi-rotor (MR) wind turbine, comprising:
a tower structure;
at least two rotors assemblies supported by the tower structure, each of the rotor assemblies comprising a plurality of blades;
one or more sensors configured to detect a lateral acceleration and a vertical acceleration in a rotor plane of a first rotor assembly of the at least two rotors assemblies; and
a controller configured to:
filter a signal corresponding to the vertical acceleration of the first rotor assembly to remove an effect of gravity from the vertical acceleration of the first rotor assembly; and
determine, based at least in part on the lateral acceleration of the first rotor assembly and the vertical acceleration of the first rotor assembly, pitch offsets for controlling pitch angles of the plurality of blades of the first rotor assembly to produce an in-plane force in the form of a rotating or an oscillating force in the rotor plane of the first rotor assembly such that a phase of the in-plane force causes the in-plane force to dampen both the lateral acceleration and the vertical acceleration.