DocumentCode :
3760750
Title :
A novel control strategy for operating grid connected Doubly Fed Induction Generators under unbalanced grid voltage
Author :
Nithin A N; Samina T;S Ramaiyer; Bishath Beevi A
Author_Institution :
Dept. of Electrical Engineering, CET Thiruvananthapuram, India
fYear :
2015
Firstpage :
218
Lastpage :
223
Abstract :
The wind turbine using doubly fed induction generators (DFIGs) is becoming a popular concept because of its improved power quality, high energy efficiency, and controllability. In DFIGs unbalanced three phase stator voltage causes a number of problems such as over current, unbalanced current, reactive power pulsation, and stress on mechanical components from torque pulsations. In this work we are proposing a technique that has the objective to keep the generator connected to the grid in the case of a grid failure. Here a three phase voltage is injected to the rotor circuit with the help of a sinusoidal PWM inverter there by the air gap flux can maintain a constant value at fault condition. This control strategy enhances the standard speed and reactive power control with controller that can compensate for the problems caused by unbalanced grid by balancing the stator current and eliminating the torque and reactive power pulsations. Thus DFIGs can stay connected to the grid under fault conditions also.
Keywords :
"Rotors","Torque","Circuit faults","Stator windings","Voltage fluctuations","Reactive power"
Publisher :
ieee
Conference_Titel :
Control Communication & Computing India (ICCC), 2015 International Conference on
Type :
conf
DOI :
10.1109/ICCC.2015.7432895
Filename :
7432895
Link To Document :
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