Stabilization of Synchronous Motors Subjected to Voltage Dips

Synchronous motors can pull out of step due to transient dips in the terminal voltage due to faults, or starting of another synchronous motor connected to the same bus. The problem of stabilizing the synchronous motor under such conditions is investigated in this paper. This is achieved by designing a suitable excitation control system that obtains feedback from rotor velocity and terminal voltage. The design is based on the concept of minimising the settling time using Lyapunov function for the linearized system.