Wind Electrical energy generating systems EMC. A dedicated experimental simulator for tests

In wind electrical energy generating systems, due to fast voltage and current fluctuations, the power converter represents a source of electromagnetic disturbances. EMI problems of stand alone wind generators are here analysed in order to take into account many different power quality problems which result in voltage fluctuations and harmonics in the net. This paper, moreover, presents a wind turbine experimental simulator (WTES) that moves a wind electrical energy generating system (WEEGS) to carry out EMI measurements and the relative experimental results. The WEEGS here taken into account comprises a wound rotor induction generator (WRIG) in which the frequency transformation from the rotor to the stator windings generate interharmonics and the direct connection between stator and grid increase the sensitivity to voltage sag. These two aspects are here discussed and the existing solutions are pointed out.