Editorial

摘要

We are pleased to present the fifth issue of our 2015 journal. This issue features important wind engineering subjects dealing with: 1) Wind resource characterization and aerodynamics, 2) Electrical aspects and control. 3) Small wind turbine systems, and 4) Offshore wind. The first paper on wind turbine aerodynamics studied the effects of finite efficiency on wake interference and power output for identical horizontal-axis wind turbines in line with the wind. Its authors are Abdulrahman and Wood from the University of Calgary (Canada). The second paper in this set is by Olauson, Samuelsson, Bergstrom, and Bergkvist from Uppsala University (Sweden). Their paper presents an evaluation of the Uppsala mesoscale model (MIUU) for the prediction of mean wind speed at a low height (10 m). For next set of papers on Electrical aspects, the third paper of this issue evaluates the control of a microgrid with enhancement of wind power evacuation. The authors are Vanitha, Varadharajan, Viswanathan and Harish from Amrita University (India). The fourth paper here is by Rajpurohit and Singh from the Indian Institute of Technology (India). In this paper they introduce a new control scheme for enhanced performance from a doubly fed induction generator (DFIG) system. The fifth and sixth papers of this issues deal with improving the performance of small wind energy conversion systems (SWECS). The first paper in this set gives an analysis of the use of electrodynamic braking of small wind turbines. Its authors are McMahon, Burton, and Sharman from Trinity College Dublin (Ireland) and Ampair Energy (UK). The next paper is by Gharali, Johnson, Lam, and Gu from the University of Warterloo (Canada) and the University of Tehran (Iran). Their paper presents a two-dimensional blade element study of a wind turbine rotor under yaw loads. Under the general subject of offshore wind, the seventh paper of this issue discusses the development of a Prognostic decision model for offshore wind turbine maintenance. The authors are Sinha and Steel from Robert Gordon University (UK). The final paper here is by Wyman and Jablonowski from the University of Texas at Austin (USA). This paper proposes a general workflow to model offshore wind projects and demonstrates the model using hypothetical projects.