Atmospheric icing on large wind turbine blades

... collision efficiency at different sections of NREL 5 MW wind turbine blade 3.2 Atmospheric ice accretion To study the rate and shape of ice accretion at different sections along the wind turbine ... parameters the ice accretion on the wind turbine blades can be minimized. This could reduce the need for de- and anti -icing systems on the wind turbine blades installed...

Ngày tải lên: 05/09/2013, 14:58

... the operation, and design consideration of the converter for grid-connected applications. I. I NTRODUCTION For inverter-based wind turbine systems in grid-connected applications as distributed ... particularly for small wind turbine systems. A single-stage inverter is an inverter with only one stage of conversion for both stepping-up and stepping-down the dc voltage from wind...

Ngày tải lên: 03/01/2014, 19:16

... additions to background noise. Design optimization is therefore needed to resolve the conflicting considerations of maximum power production and minimum noise generation. Horizontal Axis Wind Turbines ... doubly fed induction generators using MATLAB. 2. Modeling of wind turbine The turbine is a wind energy conversion system. It consists of an induction generator and other electrical...

Ngày tải lên: 05/09/2013, 16:10

... the information on wind velocity are not required. Index Terms— Wind turbine, Variable-Speed, synchronous generator, Maximum power, Buck-boost converter I. I NTRODUCTION Wind energy ... maximum power from wind turbine. The operating power of wind turbine depends on the wind speed intensity and especially the turbine speed [1]. If the transfer of power betwe...

Ngày tải lên: 03/01/2014, 19:15

... variable speed wind turbine (VSWT) configuration with non- inverting buck-boost converter. The wind turbine systems consist of permanent magnet synchronous generator (PMSG) connected to diode ... unit MPPT LPPT Operator Controller speed d Control strategy VSWT Control unit VSWT Electrical unit Fig. 1. Control concept of VSWT with non-inverting buck-boost DC-DC converter. 14th I...

Ngày tải lên: 03/01/2014, 19:15

... retrieves texts from large confirmation using confidence in recognition confirmation using significance for retrieval automatic speech recognizer (Julius) speech input confirmation for significant ... candidate, and makes confirmation based on significance for retrieval. 4.1 Confidence in recognition We define the confidence in recognition for each phrase in order to reject partial recognition...

Ngày tải lên: 20/02/2014, 16:20

... Production of Noise and Vibration by Wind Turbines 1. Wind turbines can produce unwanted sound (referred to as noise) during operation. The nature of the sound depends on the design of the wind turbine. ... WIND TURBINE HEALTH IMPACT STUDY 3 | P a g e Chapter 2 Introduction to Wind Turbines This chapter provides an introduction to wind turbines so as to provide a conte...

Ngày tải lên: 09/03/2014, 00:20

... asynchronous generator No 23) Yaw control system Wind vane 24) Upwind or downwind Upwind Espada / 0,8 kW Fortis Wind Energy HAWT from 0,8 kW to 10 kW. 15 Fortis Wind Energy Contact ... asynchronous generator No 23) Yaw control system Wind vane 24) Upwind or downwind Upwind Passaat 1,4 kW Fortis Wind Energy HAWT from 0,8 kW to 10 kW. 16 Catalogue of European Urban W...

Ngày tải lên: 24/03/2014, 05:20

... David A. Pat- terson. High-performance sorting on networks of work- stations. In Proceedings of the 1997 ACM SIGMOD In- ternational Conference on Management of Data, Tucson, Arizona, May 1997. [2] ... parallelization and distribution of large- scale computations, combined with an implementation of this interface that achieves high performance on large clusters of commodity PCs. Secti...

Ngày tải lên: 30/03/2014, 16:20

... situation is different once one moves beyond the task of factoid QA. Comparatively little research has focused on QA models for non-factoid ques- tions such as causation, manner, or reason questions. Because ... similar questions already answered (Jeon et al., 2005), i.e., our answer collection C contains only the site’s answers without the corresponding ques- tions answered. The second com...

Ngày tải lên: 31/03/2014, 00:20