Abstract
The short circuit behavior of the early generation wind turbines depends solely on the
physical characteristics of the machine. The conventional protection schemes can be
applied to provide protection to these wind farms. But the full converter based Type 4
Wind turbine generators have complex fault current characteristics which are governed
by the converter controls. The control response of the WTG’s during fault is not similar
to that of synchronous generators. The use of relay with conventional protection
schemes may cause misoperation.
In this thesis an attempt is made to explain the complex converter controls and
operation and various grid codes that the wind farms are expected to follow. A new
protection scheme is designed based on the system operation and tested with
simulation fault responses of Type 4 wind turbine in real time digital simulator. This
thesis also explains the reasons that cause misoperation for using convention
protection schemes.