Fault Tolerant Control of Switch Power Converter in WECS Based on a DFIG

In the field of Wind Energy Conversion Systems(WECS), the prediction and early detection of wind power converter failures is one of the most promising ways to control and optimize the operational costs. This chapter presents the detection of converter open switch faults and the fault tolerant of power converters fed Doubly Fed Induction Generator (DFIG) in Wind Energy Conversion Systems (WECS). The proposed control approach is based on using the grid side converter to regulate the DC link voltage constant. The mean of the rotor side converter is to track the maximum power point for the wind turbine and to maintain unity power factor at stator terminals. The description of the proposed system is presented with the detailed dynamic modeling equations. The mean value of the rotor current diagnosis technique is adopted for fault detection. The fault tolerant topology used for service continuity is that with a redundant leg. The simulations are performed using the Matlab/Simulink environment and Sim power. The fault operation is analyzed and the detection method and fault tolerant topology used are tested with encouraging results.