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Online Monitoring of Wind Power Plants using Digital Twin Models
n recent years, there have been significant developments of offshore wind technology and industry, with bottom-fixed wind turbines fully commercialized and floating wind turbines entering the market. Reducing Operational Expenditure (OPEX) for offshore wind turbines by improving the wind turbine availability based on predictive maintenance of the turbine critical components can contribute substantially to the reduction of unexpected maintenance and costs and the development of more sustainable offshore wind energy in future. For this purpose, digital twin models are an enabler.
Blade-Pitch Control for Wind Turbine Load Reductions
This thesis investigates the use of blade-pitch control and real-time wind measurements to reduce the structural loads on the rotors and blades of wind turbines. The first part of the thesis studies the main similarities between the various classes of current blade-pitch control strategies, which have to date remained overlooked by mainstream literature. It also investigates the feasibility of an estimator design that extracts the turbine tower motion signal from the blade load measurements. In turn, the second part of the thesis proposes a novel model predictive control layer in the control architecture that enables an existing controller to incorporate the upcoming wind information and constraint-handling features. This thesis provides essential clarifications of and systematic design guidelines for these topics, which can benefit the design of wind turbines and, it is hoped, inspire the development of more innovative mechanical load-reduction solutions in the field of wind energy.
Wind Turbine Aerodynamics and Vorticity-Based Methods
The book introduces the fundamentals of fluid-mechanics, momentum theories, vortex theories and vortex methods necessary for the study of rotors aerodynamics and wind-turbines aerodynamics in particular. Rotor theories are presented in a great level of details at the beginning of the book. These theories include: the blade element theory, the Kutta-Joukowski theory, the momentum theory and the blade element momentum method. A part of the book is dedicated to the description and implementation of vortex methods. The remaining of the book focuses on the study of wind turbine aerodynamics using vortex-theory analyses or vortex-methods. Examples of vortex-theory applications are: optimal rotor d...
Fundamental and Advanced Topics in Wind Power
As the fastest growing source of energy in the world, wind has a very important role to play in the global energy mix. This text covers a spectrum of leading edge topics critical to the rapidly evolving wind power industry. The reader is introduced to the fundamentals of wind energy aerodynamics; then essential structural, mechanical, and electrical subjects are discussed. The book is composed of three sections that include the Aerodynamics and Environmental Loading of Wind Turbines, Structural and Electromechanical Elements of Wind Power Conversion, and Wind Turbine Control and System Integration. In addition to the fundamental rudiments illustrated, the reader will be exposed to specialized applied and advanced topics including magnetic suspension bearing systems, structural health monitoring, and the optimized integration of wind power into micro and smart grids.
Explorations in Semantic Parallelism
This collection of eighteen papers explores issues in the study of semantic parallelism — a world-wide tradition in the composition of oral poetry. It is concerned with both comparative issues and the intensive study of a single living poetic tradition of composition in strict canonical parallelism. The papers in the volume were written at intervals from 1971 to 2014 — a period of over forty years. They are a summation of a career-long research effort that continues to take shape. The concluding essay reflects on possible directions for future research.
SPECIAL EVENT POSTMARKS OF THE UNITED KINGDOM VOLUME 1
A catalogue of postmarks used on mail posted at congresses, exhibitions, shows etc, and for anniversaries from 1851-1962.
The Exercise of the Spatial Imagination in Pre-Modern China
This volume is distinctive for its extraordinarily interdisciplinary investigations into a little discussed topic, the spatial imagination. It probes the exercise of the spatial imagination in pre-modern China across five general areas: pictorial representation, literary description, cartographic mappings, and the intertwining of heavenly and earthly space. It recommends that the spatial imagination in the pre-modern world cannot adequately be captured using a linear, militarily framed conceptualization. The scope and varying perspectives on the spatial imagination analyzed in the volume’s essays reveal a complex range of aspects that informs how space was designed and utilized. Due to the complexity and advanced scholarly level of the papers, the primary readership will be other scholars and advanced graduate students in history, history of science, geography, art history, religious studies, literature, and, broadly, sinology.
