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Wind turbine asymmetrical load reduction with pitch sensor fault compensation

Liu, Yanhua; Patton, Ron J.; Shi, Shuo


Yanhua Liu

Shuo Shi


Offshore wind turbines suffer from asymmetrical loading (blades, tower, etc), leading to enhanced structural fatigue. As well as asymmetrical loading different faults (pitch system faults etc.) can occur simultaneously, causing degradation of load mitigation performance. Individual pitch control (IPC) can achieve rotor asymmetric loads mitigation, but this is accompanied by an enhancement of pitch movements leading to the increased possibility of pitch system faults, which exerts negative effects on the IPC performance. The combined effects of asymmetrical blade and tower bending together with pitch sensor faults are considered as a “co‐design” problem to minimize performance deterioration and enhance wind turbine sustainability. The essential concept is to attempt to account for all the “fault effects” in the rotor and tower systems, which can weaken the load reduction performance through IPC. Pitch sensor faults are compensated by the proposed fault‐tolerant control (FTC) strategy to attenuate the fault effects acting in the control system. The work thus constitutes a combination of IPC‐based load mitigation and FTC acting at the pitch system level. A linear quadratic regulator (LQR)‐based IPC strategy for simultaneous blade and tower loading mitigation is proposed in which the robust fault estimation is achieved using an unknown input observer (UIO), considering four different pitch sensor faults. The analysis of the combined UIO‐based FTC scheme with the LQR‐based IPC is shown to verify the robustness and effectiveness of these two systems acting together and separately.


Liu, Y., Patton, R. J., & Shi, S. (2020). Wind turbine asymmetrical load reduction with pitch sensor fault compensation. Wind energy, 23(7), 1523-1541.

Journal Article Type Article
Acceptance Date Feb 17, 2020
Online Publication Date Mar 11, 2020
Publication Date 2020-07
Deposit Date May 4, 2020
Publicly Available Date Oct 27, 2022
Journal Wind Energy
Print ISSN 1095-4244
Electronic ISSN 1099-1824
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 23
Issue 7
Pages 1523-1541
Keywords Fault-tolerant control; Individual pitch control; Pitch sensor faults; Wind turbine; Asymmetrical load reduction
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