AUTO EXCITATION CONTROL OF SYNCHRONOUS GENERATOR USING INSULATED GATE BIPOLAR TRANSISTOR AND MICROCONTROLLER

摘要

Main part of the power system is synchronous generator. All the loads are fed by generator. However any fluctuation in load may cause ultimate fluctuation in terminal voltage of alternator i.e. synchronous generator. And if alternator is damaged then power cannot be available. Therefore, alternator's terminal voltage has to be maintained at rated value at any values of load. So in order to maintain the voltage (output) at a constant value, alternator's input means should vary with the fluctuations and every time they give input in such a way that terminal voltage remains constant. Now as alternator is doubly excited machine, it has two input means (1) by prime mover (speed) (2) by field current (excitation). This invention deals with the excitation. A feedback system is prepared which can sense this fluctuation, controls it and gives the steady input to the system thereby maintaining the voltage at constant value.