Question

1. A three-phase voltage source is feediing the three phase receiving end voltage through a three phase series impedance. To compensate the lines, a series voltage is injected using the three phase static synchronous series compensator (SSSC). Draw a schematic diagram of this system including the lines, the transformer and the converter. 2. The per unit source voltage magnitude is 1.0 pu with an angle of 10 degrees while per unit phase voltage of the receiving end is 0.95 pu with an angle of 70 degrees. The per unit series reactance 0.4 pu. It is desired to reduce the effective reactance to 0.25 pu using a three phase SSC. 1) Calculate the series per phase voltage to be injected to reduce the effective per phase line reactance to be 0.25 pu 2) Calculate the new active and reactive powers at the receiving end.

Answer 1

TuJuchice tmhumuy 3- Line ies wesane R L 3-B Saunce R L 3-6 Liad 3-Ø Convetin SoUce

Tstotic ymchamus Soio Cupenalan (sss) in tnansmission line by hhing volhage tnugh Aenin (annedes whrh Quedatne (n') toil k which aensats induchve lineCussent and Capai ive Aartanas bases he Conay (an be caoly undnand by Limpe enuivdlnt Auik on dsine a Liva Jmfedencs volage ndrde lloge t0 line whith aloo baanca üi bok Athv« V Souna hhippaing3-4 onveabus Ne Can