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Comparison of power electronics lifetime between vertical- and horizontal-axis wind turbines

Content Provider	IET Digital Library
Author	Parker, Max Alexander Soraghan, Conaill Giles, Alex
Abstract	A comparison has been made of the power electronics lifetime for 5MW horizontal- and vertical-axis wind turbines, based on dynamic models supplied with generated wind speed time series. Both two- and three-bladed stall-regulated H-rotor vertical-axis turbines were modelled, with several different control parameters. Vertical-axis turbines are likely to lead to a shorter power electronics lifetime as the aerodynamic torque varies with rotor azimuth, leading to a cyclic generator torque, and increased thermal cycling in the power electronics. An electro-thermal model of a low-voltage converter was created, and used to calculate the switching device temperatures based on the generator torque and speed time series from the turbine model. An empirical lifetime model and rainflow-counting algorithm were used to calculate the lifetime, and this was repeated at different average wind speeds to determine the overall lifetime. The vertical-axis turbine was found to have a lower power electronics lifetime than the horizontal-axis, or require a larger number of parallel switching devices to achieve the same lifetime, although this was lessened by running the turbine with a more relaxed speed control, allowing the rotor inertia to partially absorb the aerodynamic torque ripple.
Starting Page	679
Ending Page	686
Page Count	8
ISSN	17521416
Volume Number	10
e-ISSN	17521424
Issue Number	Issue 5, May (2016)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-rpg/10/5
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-rpg.2015.0352
Journal	IET Renewable Power Generation
Publisher Date	2016-05-01
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Converter Loss Converter Reliability Cost Reduction Cyclic Temperature Variation Cyclic Torque Variation Diode Energy Cost Reduction Failure Analysis HAWTs Horizontal-axis Wind Turbines IGBTs Offshore Installations Offshore Turbines Power Converter Power Electronic Converter Power Electronic Lifetime Power Supplies to Apparatus Pulsating Loss Reliability Rotor Position Rotor Torque Thermal Cycling Turbine Failure Source Two-bladed Turbine Variable-speed Wind Turbine VAWTs Vertical-axis Wind Turbines Wind Power Plant Wind Speed Variation Wind Turbine
Content Type	Text
Resource Type	Article
Subject	Renewable Energy, Sustainability and the Environment

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