Model Derivation of an Adjustable Speed Generator and its Excitation Control System

Adjustable speed generator has the capability of controlling easily its output power by secondary-excitation control system. It makes a contribution to increasing AFC (Automatic Frequency Control) operation capacity on electric network, and makes it possible that the disturbance will decrease rapidly when fault is occurred. In order to simulate such a response of the system in network transient analyzing program, we derived the system model which includes a circuit for excitation power supply, and analyzed its responses for verification of validity of the model.