The difference between detected voltage and given reference voltage is called as the error voltage. There are two main types of automatic voltage regulators (AVR):Īn automatic voltage regulator detects the terminal voltage and compares it with the reference voltage. For this purpose, alternators are provided with excitation control or automatic voltage regulator systems. The field current must be increased to compensate this voltage drop, such that the terminal voltage is at the target value. As the load current, and hence the armature current, increases, voltage drop in the armature also increases. The terminal voltage of an alternator can be given as V = E - IZ. Induced emf (E) of a synchronous generator (alternator) depends on the excitation current (field current). Using excitation control or voltage regulators at generating stationsĮxcitation control or voltage regulators at generating stations.Methods of voltage control in power system Following are the methods of voltage control in power system. Therefore, it is important to apply certain techniques, certain methods to control the power system voltage to keep it constant.
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