DYNAMIC ELECTRIC BRAKE FOR A VARIABLE SPEED WIND TURBINE HAVING AN EXCITER MACHINE AND A POWER CONVERTER NOT CONNECTED TO THE GRID

摘要

A variable speed, wind turbine having a doubly fed induction generator (DFIG), includes an exciter machine (212) mechanically coupled to the DFIG and a power converter (230) placed between a rotor (211) of the DFIG and the exciter machine. Thus, the power converter is not directly connected to the grid avoiding the introduction of undesired harmonic distortion and achieving a better power quality fed into the utility grid. The system also comprises on electric brakecircuit (231). Moreover, the variable speed wind turbine includes a power control and a pitch regulation.