Answer Happy

Solve a & b
Consider the following power system, where an induction motor and a 6-pulse convertor are fed from a 6 kV busbar. Fundamental current and the harmonic currents of the convertor is given in the following table. Transformer and induction motor resistances are known to follow R(h) = R(1)*0.35*115 13 Order of Harmonic Harmonic Current: IVA) 1 600 5 120 7 55 11 35 17 10 19 9 22 a) Construct the equivalent circuit and determine equivalent circuit parameters at fundamental frequency b) Assume that convertor bus (Bus-3) is at 6 kV. Determine the voltages of Bus-2 and Bus-1 and power factor of Bus-2 at fundamental frequency. c) Determine bus voltages and line currents for 58 thru 19# harmonics. d) Determine THD for bus voltages and line currents. e) Determine the value of the capacitance that can improve bus pf to 0.95 when connected to Bus-2 f) Repeat case-c after compensation. g) Repeat case-d after compensation. h) Will THD at Bus 3 exceed IEEES19? Bus-1 36 KV. 100 MVA, XR-10 T: T.. 36/6 KV. 20 MVA, 266, XR-9 T2.6/6 kV. 8 MVA. Z-68. X/R-8 Bus-2 IM : 6 KV. 6 MVA. pf-0.90 at 50 Hz IM 6 pulse couvertor: 600 Apf-0.80 at 50 Hz 6KV T: 6 kV Bus 3 6 puise convertor