Optimal multivariable individual pitch control for load reduction of large wind turbines

2016 ◽  
Author(s):  
Mehdi Vali ◽  
Jan-Willem van Wingerden ◽  
Martin Kuhn
Keyword(s):  
Wind Turbines ◽  
Load Reduction ◽  
Pitch Control ◽  
Individual Pitch Control ◽  
Large Wind

Flexure pitch bearing concept for individual pitch control of wind turbines

Wind Energy ◽  
2017 ◽  
Vol 21 (2) ◽  
pp. 129-138 ◽  
Author(s):  
Michael Juettner ◽  
Alexander Hasse ◽  
Stephan Tremmel
Keyword(s):  
Wind Turbines ◽  
Pitch Control ◽  
Pitch Bearing ◽  
Individual Pitch Control

Gain-phase margins-based delay-dependent stability analysis of pitch control system of large wind turbines

2019 ◽  
Vol 41 (13) ◽  
pp. 3626-3636 ◽  
Author(s):  
Omer Turksoy ◽  
Saffet Ayasun ◽  
Yakup Hames ◽  
Sahin Sonmez
Keyword(s):  
Control System ◽  
Stability Analysis ◽  
Wind Turbines ◽  
Time Domain ◽  
Dynamic Performance ◽  
Pitch Control ◽  
Wide Range ◽  
Delay Dependent ◽  
Delay Dependent Stability ◽  
Large Wind

This paper investigates the effect of gain and phase margins (GPMs) on the delay-dependent stability analysis of the pitch control system (PCS) of large wind turbines (LWTs) with time delays. A frequency-domain based exact method that takes into account both GPMs is utilized to determine stability delay margins in terms of system and controller parameters. A gain-phase margin tester (GPMT) is introduced to the PCS to take into GPMs in delay margin computation. For a wide range of proportional–integral controller gains, time delay values at which the PCS is both stable and have desired stability margin measured by GPMs are computed. The accuracy of stability delay margins is verified by an independent algorithm, Quasi-Polynomial Mapping Based Rootfinder (QPmR) and time-domain simulations. The time-domain simulation studies also indicate that delay margins must be determined considering GPMs to have a better dynamic performance in term of fast damping of oscillations, less overshoot and settling time.

Load reduction for two-bladed horizontal-axis tidal current turbines based on individual pitch control

2020 ◽  
Vol 207 ◽  
pp. 107183
Author(s):  
Hongwei Liu ◽  
Yangjian Li ◽  
Yonggang Lin ◽  
Wei Li ◽  
Yajing Gu
Keyword(s):  
Tidal Current ◽  
Horizontal Axis ◽  
Load Reduction ◽  
Pitch Control ◽  
Individual Pitch Control
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