A closed-loop quasi-optical dynamic braking resistor and shunt reactor control strategy for transient stability (of synchronous generators)

A control strategy for dynamic braking resistor and shunt reactor is proposed for stabilization of electric generators subjected to large disturbances. The time optimal control is derived as a function of synchronous machine power, its rotor angular position, and speed deviation. The response for a single-machine system with the proposed control has been obtained using the steepest-descent method. The strategy has also been tested on two multimachine systems. Results indicate that the proposed strategy provides a simple and effective method of stabilization under transient emergency conditions. It is found that the strategy is very effective in controlling first swing instability.<>