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Wind turbines are one of the most promising renewable energy technologies, and this motivates fertile research activity about developments in power optimization. This topic covers a wide range of aspects, from the research on aerodynamics and control design to the industrial applications about on-site wind turbine performance control and monitoring. This Special Issue collects seven research papers about several innovative aspects of the multi-faceted topic of wind turbine power optimization technology. The seven research papers deal respectively with the aerodynamic optimization of wind turbine blades through Gurney flaps; optimization of blade design for large offshore wind turbines; control design optimization of large wind turbines through the analysis of the competing objectives of energy yield maximization and fatigue loads minimization; design optimization of a tension leg platform for floating wind turbines; innovative methods for the assessment of wind turbine optimization technologies operating on site; optimization of multiple wake interactions modeling through the introduction of a mixing coefficient in the energy balance method; and optimization of the dynamic stall control of vertical-axis wind turbines through plasma actuators. This Special Issue presents remarkable research activities in the timely subject of wind turbine power optimization technology, covering various aspects. The collection is believed to be beneficial to readers and contribute to the wind power industry.

ANN --- DBD plasma actuation --- aerodynamics --- vertical-axis wind turbine --- PSO algorithm --- variable-speed wind turbine --- wind turbine --- wind energy --- analytical model --- wind farm efficiency --- omega arithmetic method --- wake interaction model --- tower fatigue --- floating offshore wind turbine --- dynamic stall --- nonlinear economic-model predictive control --- hydrodynamic motion response --- active flow control --- control and optimization --- wind farm --- blade optimization --- tension leg platform --- structures --- flow control --- Gurney flap --- time-domain coupled model --- drive-shaft torsion --- mixing coefficient --- modified Morison equation --- wind turbines --- FAST --- turbulence intensity

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The Special Issue “Assessment and Nonlinear Modeling of Wave, Tidal, and Wind Energy Converters and Turbines” contributes original research to stimulate the continuing progress of the offshore renewable energy (ORE) field, with a focus on state-of-the-art numerical approaches developed for the design and analysis of ORE devices. Particularly, this collection provides new methodologies, analytical/numerical tools, and theoretical methods that deal with engineering problems in the ORE field of wave, wind, and current structures. This Special Issue covers a wide range of multidisciplinary aspects, such as the 1) study of generalized interaction wake model systems with elm variation for offshore wind farms; 2) a flower pollination method based on global maximum power point tracking strategy for point-absorbing type wave energy converters; 3) performance optimization of a Kirsten–Boeing turbine using a metamodel based on neural networks coupled with CFD; 4) proposal of a novel semi-submersible floating wind turbine platform composed of inclined columns and multi-segmented mooring lines; 5) reduction of tower fatigue through blade back twist and active pitch-to-stall control strategy for a semi-submersible floating offshore wind turbine; 6) assessment of primary energy conversion of a closed-circuit OWC wave energy converter; 7) development and validation of a wave-to-wire model for two types of OWC wave energy converters; 8) assessment of a hydrokinetic energy converter based on vortex-induced angular oscillations of a cylinder; 9) application of wave-turbulence decomposition methods on a tidal energy site assessment; 10) parametric study for an oscillating water column wave energy conversion system installed on a breakwater; 11) optimal dimensions of a semisubmersible floating platform for a 10 MW wind turbine; 12) fatigue life assessment for power cables floating in offshore wind turbines.

off-shore wind farms (OSWFs) --- wake model --- wind turbine (WT) --- Extreme Learning Machine (ELM) --- wind power (WP) --- large-eddy simulation (LES) --- point-absorbing --- wave energy converter (WEC) --- maximum power point tracking (MPPT) --- flower pollination algorithm (FPA) --- power take-off (PTO) --- hill-climbing method --- Kirsten–Boeing --- vertical axis turbine --- optimization --- neural nets --- Tensorflow --- ANSYS CFX --- metamodeling --- FOWT --- multi-segmented mooring line --- inclined columns --- semi-submersible --- AFWT --- floating offshore wind turbine (FOWT) --- pitch-to-stall --- blade back twist --- tower fore–aft moments --- negative damping --- blade flapwise moment --- tower axial fatigue life --- wave energy --- oscillating water column --- tank testing --- valves --- air compressibility --- air turbine --- wave-to-wire model --- energy harnessing --- energy converter --- flow-induced oscillations --- vortex-induced vibration --- flow–structure interaction --- hydrodynamics --- vortex shedding --- cylinder wake --- tidal energy --- site assessment --- wave-current interaction --- turbulence --- integral length scales --- wave-turbulence decomposition --- OWC --- wave power converting system --- parametric study --- caisson breakwater application --- floating offshore wind turbines --- frequency domain model --- semisubmersible platform --- 10 MW wind turbines --- large floating platform --- platform optimization --- wind energy --- floating offshore wind turbine --- dynamic analysis --- fatigue life assessment --- flexible power cables --- Daguragu / Kalkaringi / Wave Hill (Central NT SE52-08)

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The coastal zone is the host to many human activities, which have significantly increased in the last decades. However, sea level rise and more frequent storm events severely affect beaches and coastal structures, with negative consequences and dramatic impacts on coastal communities. These aspects add to typical coastal problems, like flooding and beach erosion, which already leading to large economic losses and human fatalities. Modeling is thus fundamental for an exhaustive understanding of the nearshore region in the present and future environment. Innovative tools and technologies may help to better understand coastal processes in terms of hydrodynamics, sediment transport, bed morphology, and their interaction with coastal structures. This book collects several contributions focusing on nearshore dynamics, and span among several time and spatial scales using both physical and numerical approaches. The aim is to describe the most recent advances in coastal dynamics.

bending failure --- wind energy --- switching overvoltage --- marine energy --- floating offshore wind turbine (FOWT) --- hydrogen storage --- different loading directions --- armour --- vacuum circuit breaker --- HVAC --- CAES --- electrical connection --- reignition characteristics --- combined static and dynamic loads --- gravity-based structures --- ocean energy --- onshore-offshore wind power plant --- ERA5 --- development --- foundations --- weight --- jacket --- monopile --- monitoring --- frequency response functions --- renewable energies --- HVDC --- offshore wind farm --- size --- support structure --- free vortex wake --- P2X --- operation and maintenance --- horizontal vibration --- scour phenomenon --- load mitigation --- model testing --- support structures --- GBF --- safety factor --- design response spectrum --- nominal diameter --- wave --- aiRthermo --- broken mooring line --- tripod --- tension leg platforms --- mooring system --- wind power density --- physical models --- wind resource --- floating --- design and construction --- GBS --- ocean thermal --- air density --- loads and response --- coupled dynamic response --- tidal --- offshore wind energy --- offshore wind turbine --- optimal selection factors --- Lebanon --- trailing-edge flap --- ice force --- offshore wind --- wind turbine generators --- numerical models --- crushing failure --- marine currents

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This book is a collection of papers covering various aspects of the optimal control of power and energy production from renewable resources (wind, PV, biomass, hydrogen, etc.). In particular, attention is focused both on the optimal control of new technologies and on their integration in buildings, microgrids, and energy markets. The examples presented in this book are among the most promising technologies for satisfying an increasing share of thermal and electrical demands with renewable sources: from solar cooling plants to offshore wind generation; hybrid plants, combining traditional and renewable sources, are also considered, as well as traditional and innovative storage systems. Innovative solutions for transportation systems are also explored for both railway infrastructures and advanced light rail vehicles. The optimization and control of new solutions for the power network are addressed in detail: specifically, special attention is paid to microgrids as new paradigms for distribution networks, but also in other applications (e.g., shipboards). Finally, optimization and simulation models within SCADA and energy management systems are considered. This book is intended for engineers, researchers, and practitioners that work in the field of energy, smart grid, renewable resources, and their optimization and control.

fuel cell --- power control --- multi-objective optimization --- equivalent consumption minimization strategy --- firefly algorithm --- hybrid light rail vehicle --- solar energy --- Fresnel collector --- model predictive control --- fuzzy algorithm --- hybrid systems --- shipboard microgrids --- photovoltaic (PV) systems --- energy storage technologies --- microgrids --- hybrid energy storage systems (HESS) --- floating offshore wind turbine --- aerodynamic platform stabiliser --- wave rejection --- feedback loop --- control --- optimisation --- energy storage --- pumped storage hydro --- ternary pumped storage hydro --- dynamic simulation --- dynamic modeling --- inertia --- renewable energy --- power system --- primary control --- BESS --- microgrid --- Grid Forming --- Grid Support --- Inverter Control --- DIgSILENT PowerFactory --- EMT simulations --- eco-friendliness --- smart railway --- smart electrical infrastructure --- control algorithm --- regenerative braking energy --- smart grid --- optimization --- energy management system --- interconnected buildings --- renewable resources --- multi-level --- aggregator --- wind-diesel power plant --- intelligent control system --- diesel-generator set --- internal combustion engine --- artificial neural network --- fuel economy --- co-simulation --- SCADA --- operator training --- building energy management system --- simulation --- equivalent electric circuit

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Wind turbine aerodynamics is one of the central subjects of wind turbine technology. To reduce the levelized cost of energy (LCOE), the size of a single wind turbine has been increased to 12 MW at present, with further increases expected in the near future. Big wind turbines and their associated wind farms have many advantages but also challenges. The typical effects are mainly related to the increase in Reynolds number and blade flexibility. This Special Issue is a collection of 21 important research works addressing the aerodynamic challenges appearing in such developments. The 21 research papers cover a wide range of problems related to wind turbine aerodynamics, which includes atmospheric turbulent flow modeling, wind turbine flow modeling, wind turbine design, wind turbine control, wind farm flow modeling in complex terrain, wind turbine noise modeling, vertical axis wind turbine, and offshore wind energy. Readers from all over the globe are expected to greatly benefit from this Special Issue collection regarding their own work and the goal of enabling the technological development of new environmentally friendly and cost-effective wind energy systems in order to reach the target of 100% energy use from renewable sources, worldwide, by 2050

simplified free vortex wake --- n/a --- H-type VAWT --- variable pitch --- wind tunnel experiment --- rotor blade optimization --- Non-dominated Sorting Genetic Algorithm (NSGA-II) --- wake effect --- wind turbine noise propagation --- RANS --- axial steady condition --- wind turbine blades --- optimization --- computational fluid dynamic --- straight blade --- typhoon --- gradient-based --- image processing --- actuator line method --- piezo-electric flow sensor --- stall --- turbulence --- airfoil design --- vortex ring --- defects --- DMST model --- wind turbine design --- S809 airfoil --- dynamic fluid body interaction --- Computational Fluid Dynamics --- ABL stability --- semi-submersible platform --- random search --- floating offshore wind turbine --- blade length --- adjoint approach --- Fatigue Loads --- wind turbine optimization --- wind turbine airfoil --- particle swarm optimization --- rotational augmentation --- NREL Phase VI --- mechanical performance --- coupling of aerodynamics and hydrodynamics --- tip speed ratio --- aerodynamics --- oscillating freestream --- super-statistics --- blade element momentum theory --- wind turbine --- wind energy --- boundary layer separation --- wind turbine blade optimization --- actuator disc --- dynamic stall --- complex terrain --- laminar-turbulent transition --- SCADA --- OpenFOAM --- atmospheric stability --- computational fluid dynamics --- economic analysis --- OC5 DeepCWind --- wind tunnel --- actuator disk --- meso/microscale --- cost of energy --- power coefficient --- pitch oscillation --- condition monitoring --- aerodynamic characteristics --- blade parametrization --- wind turbine wakes --- truss Spar floating foundation --- wind resource assessment --- wind shear --- wind turbine noise source --- design --- low wind speed areas --- aerodynamic --- wind farm --- met mast measurements --- turbulent inflow --- VAWTs (Vertical axis wind turbines) --- thermography --- wind speed extrapolation --- MEXICO --- wind turbine wake --- aerodynamic force --- layout optimization --- H-type floating VAWT --- LES --- NACA0012