Improved Control of Dynamic Responses of Wind Driven DFIG under Fault Condition

This paper investigates the operation of wind driven DFIG under unbalance Voltage or unsymmetrical fault condition. According to grid codes worldwide the wind driven DFIG are required to supply reactive power during and after the fault. It has been observed that the conventional vector control method used for control of DFIG does not work well during fault conditions. To reduce the oscillations in Generator Speed, Rotor currents and to maintain constant DC link Voltage a new control strategy has to be presented. The paper presents a development in methodologies for controlling wind driven DFIG during fault ride conditions without sequential decomposition of positive and negative sequence currents and controlling it with PI plus proportional Resonant controller both on Rotor side and grid side converter. The entire model is simulated in MATLAB /Simulink environment.