Comparative Power Quality Investigations of Variable Speed Wind Energy Converters with Doubly-fed Induction and Synchronous Generator

Two different types of variable speed wind energy converters (WECs) each of 1.5 MW nominal power were investigated: the doubly-fed induction generator (DFIG) and the synchronous generator (SG) which are used in modern wind turbine applications. Power quality (PQ) measurements from both systems will be presented. Graphs of different distortion factors are given. Four generators were measured. Differences between the systems will be explained and proposals for power quality improvements will be given. In the theoretical part the basic equations of the generator types and the special features of grid connection were set up. The comparison of the WEC measurement results leads to conclusions about possible power quality improvements.

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