Describe two methods of controlling voltage in a power system.

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load is supplied through a 275kV link of total reactance 50V from an infinite busbar at 275 kV. Plot the receiving-end voltage against power graph for a constant load power factor of 0.95 lagging. The system resistance may be neglected.

 Describe two methods of controlling voltage in a power system.

a. Show how the scalar voltage difference between two nodes in a network is given approximately by: DV ¼ RP þ XQ V Each phase of a 50km, 132km overhead line has a series resistance of 0.156 V/km and an inductive reactance of 0.4125V/km. At the receiving end the voltage is 132 kV with a load of 100MVA at a power factor of 0.9 lagging. Calculate the magnitude of the sending-end voltage.

b. Calculate also the approximate angular difference between the sendingend and receiving-end voltages.