Analysis of mechanical power fluctuations in asynchronous WEC's

In recent years, wind energy has become an important part of electrical pow er generation in some countries. Some problems such as small voltage variat ions and flicker can be caused by wind turbines and wind farms, when wind s peed variations produce mechanical power fluctuations. The consequence is t hat speed changes in the turbine rotor are produced, which lead to variatio ns in their currents and voltages. The purpose of this paper is to study the relationship between fluctuations of mechanical power, rotor speed and currents as a function of their frequ encies, in order to establish the models that should be used to analyse slo w voltage variations and flicker problems. Simulations are carried out using a dynamic model of the induction machine and assuming sinusoidal waveforms for the fluctuations of the mechanical po wer.