The modeling and application of step voltage regulators

Supplying every customer a voltage that is within ANSI standards is a basic requirement of a distribution feeder. As the load on a feeder varies the voltage supplied to every customer will also vary. Some means of regulating the customer voltages must be implemented. Switched shunt capacitors and step voltage regulators are the two most common means used for regulating voltages. This paper addresses the modeling and the application of step voltage regulators. A method of calculating the compensator R and X settings will be presented. Examples of the application of step voltage regulators with and without shunt capacitors will be presented.