#Avr control on generators generator
It should be able to apply the negative sealing voltage across the generator field winding for a quick de-excitation of the generator. What are the technical requirements for an AVR? If the generator operates in light load and if an additional load is applied to the generator then there would be a quick drop of the generator’s terminal voltage, so during this situation, our major choice is to apply voltage in addition to the existing field voltage. So in order to decrease the excitation voltage very quickly, a negative voltage can be applied to the DC voltage. So the AVR would detect this increase in the voltage level, so this problem must be solved quickly and the AVR operation is not quick enough for this and if this fault is not cleared quickly then the generator could become unstable. In case if the generator load is disconnected or thrown off due to some reason and this would cause a sudden increase in the voltage level. This is the input regulation, this is the percentage of the output voltage change with the input. The load regulation can also be described as the load voltage percentage change. 
There would be a change in the output voltage in case if there is a change in the load current and this must be regulated. There are two types of voltage regulation and they are The output voltage of a power supply would change according to the load and it would also vary according to the input.
AVR would maintain the generator’s output power. It would support controlling the frequency for large interconnections. It can suppress the overvoltage on the load rejection. The stability of the power system will be improved, transient stability and dynamic stability can be achieved with the help of AVR. It would adjust the reactive power by doing the voltage regulation in the generator. 
The AVR can regulate the generator terminal voltage, the terminal voltage will be detected by the AVR, and then it would be compared with the setter.The voltage at the terminals of all the equipment of the system would be in the acceptable limits.It would help to achieve the reliable operation of the power system.What are the major functions of a voltage regulator?
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