A closed-loop control based braking resistor for stabilization of wind generator system

Conventional braking resistor (BR) method employing a fixed insertion period does not work well to stabilize the wind generator system for different types of faults. This paper proposes a closed-loop control strategy of the braking resistor based on thyristor technology to stabilize the wind generator system. The performance of the proposed braking resistor is evaluated in detail considering both balanced and unbalanced types of temporary and permanent faults in the system. A comparison is made between the performance of the proposed braking resistor and that of the conventional braking resistor employing a fixed insertion period. Simulation results show that the proposed braking resistor is very effective to stabilize the wind generator system in case of both balanced and unbalanced types of transient and permanent faults. Also, the performance of the proposed braking resistor method is much better than that of the conventional method.