Today governments put a special importance on wind energy turbines because wind energy has great potential of all renewable energies. By 2030 most of the developed countries are
In the present study, power quality issues such as power fluctuations, voltage fluctuations, and flicker emission are investigated and compared in two-bladed WTs with rigid and teetered rotors in different
For instance, an 80-m tower can let 2 to 3-MW wind turbines produce more power, and enough to justify the additional cost of 20-m more, than if installed at 60 m. Taller towers will also let larger turbines enter the market.
It then discusses the relevant power quality issues of the wind turbine types and collector systems. A case study is used to illustrate the issue of harmonics and compliance with the IEEE-519 recommended limits for
Moreover, when wind turbines are part of the grid thepower, quality seems to be a complex issue which highly depends on the interaction betweenthe grid and the wind turbines. The main impact on the grid by the wind turbines, concerningpower quality, is related to voltage changes and fluctuations, harmonic content, power peaksand flicker.
The reliability of a wind turbine needs to be maximized, as it also determines the other challenges such as maintenance. Referring to statistics on malfunctioning of the turbine, more than 20% of failures in large wind turbines occur due to malfunctioning of the gearbox .
An optimum design of the onshore wind turbine (WT) tower structure is crucial for achieving an economic, efficient and safe design of the entire onshore WT system.
Furthermore, increasing the height of the tower will enable the turbine to receive high wind speed. Moreover, wind speed and power can increase by 20% and 30%, respectively, with increasing the tower height of 10 m. Under extreme wind conditions, the wind turbine rotates extremely fast, which can damage the turbine [76, 77].
The soft–stiff structural design is normally used for wind turbine towers. In this design, the first natural frequency of the wind turbine tower sits between the f 1 P and f 3 P frequencies. In this study, f 1 s t is designed to avoid both f 1 P and f 3 P frequencies with a tolerance of ± 5 % (Lloyd and Hamburg, 2010).
The methods used in the design of wind turbine towers can be roughly categorised into two types, i.e. (1) partial safety factor (PSF) design, where uncertainties in the uncertain variables are considered by PSFs; and (2) reliability based design, where the uncertainties are accounted for through stochastic modelling.
