Belt drive turntables can require maintenance (belts occasionally wear out), and they can be less precise, causing speed variations heard as wow and flutter.
WITH nearly two-dozen states now enacting some sort of restriction on the use of cellphones while driving, the random weaving and inexplicable speed variations, the short stops and sudden lateral jerks of drivers with phones tucked against their ears are slowly becoming things of the past.
Therefore, the methods could tolerate speed variations quite robustly.
Table 6 shows the result of evaluating speed variations.
Also, monthly and annual wind speed variations are analyzed.
We interpret these as the lowest detectable speed variations.
Uncertainties yielded by the wind speed variations, WT locations, power factor fluctuations are considered.
Otherwise the effects of large design speed variations in the database would prevail.
These rotor speed variations are very small, approximately 1 to 2percentt.
The proposed inertia controller can adapt to wind speed variations while providing optimum inertial response.
Wind speed variations, local load variations, and voltage sag are simulated.
