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Investigation of potential extreme load reduction for a two-bladed upwind turbine with partial pitch

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posted on 08.02.2021, 08:56 authored by Taeseong KimTaeseong Kim, Torben J Larsen, Anders Yde
This paper presents a wind turbine concept with an innovative design combining partial pitch with a two-bladed (PP-2B) turbine configuration. Special emphasis is on extreme load reduction during storm situations at standstill, but operational loads are also investigated. In order to compare the loads and dynamics of the PP-2B turbine, a partial pitch three-bladed (PP-3B) turbine and a normal pitch regulated three-bladed (3B) turbine are introduced on the basis of solidity similarity scaling. From the dynamic comparisons between two- and three-bladed turbines, it has been observed that the blade vibrations are transferred differently from the rotor to the tower. For a three-bladed turbine, blade vibrations seen in a fixed frame of reference are split with ±1P only. A two-bladed turbine has a similar split of ±1P but also includes contributions on higher harmonics (±2P, ±3P, ... etc.). Further on, frequency split is also seen for the tower vibrations, where an additional ±2P contribution has been observed for the two-bladed turbine. Regarding load comparisons, the PP-2B turbine produces larger tower load variations because of 2P excitation during the operational cases. However, extreme loads are reduced by approximately 20% for the PP-2B and 18% for the PP-3B compared with the 3B turbine for the parked condition in a storm situation. Moreover, a huge potential of 60% is observed for the reduction of the extreme tower bottom bending moment for the PP-2B turbine, when the wind direction is from ±90° to the turbine, but this also requires that the turbine is parked in a T-configuration.

Funding

EUDP-2011 II project Demonstration of Partial Pitch 2-Bladed Wind Turbine Performance.

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

Wind Energy

Volume

18

Issue

8

Pages

1403 - 1419

Publisher

Wiley

Version

VoR (Version of Record)

Rights holder

© The Authors

Publisher statement

This is an Open Access Article. It is published by Wiley under the Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported Licence (CC BY-NC-ND 3.0). Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/3.0/

Acceptance date

27/04/2014

Publication date

2014-06-11

Copyright date

2014

ISSN

1095-4244

eISSN

1099-1824

Language

en

Depositor

Deposit date: 8 February 2021