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47 Check your understanding Consider the following three-bus power system where transmission line impedances and power are shown in per unit on 100 MVA base: Po = 3.0 pu Bus Islack) Bus 2 (PV) j0.2 pu Vi = 1.00 po Bus 3 (load) @0 10.4 pu j0.1 pu S = 2 + j0.3 pu V = 1.00 pu B=0 S3 + jo. Spu Given the bus output data in per unit as follows: Bus IV Angle (deg.) 1 1.0 0.0 PG Qc PL Q ??? 0.5253 0.0 0.0 2 1.0 - 11.9749 3.0 1.4574 2.0 al els 0.3 3 0.9180 -24.7974 0.0 0.0 30 a) Determine the power generation of the slack bus, Po, in per-unit b) Find the total reactive power losses of the system in per-unit c) Calculate the equivalent load impedance, Zus, in per-unit ( magnitude and angle) at bus# 3 4) Write the power flow through the transmission lines in per unit (fill in the table below Transmission Line Bus to Bus) P 0 I to 2 1,0774 0.10 2 to -1.0374 OJOS 1103 04165 31 2 to 3 3 to 2 -0.525