For a three-bus power system, assume bus 1 is the slack with a per unit voltage of

Question:

For a three-bus power system, assume bus 1 is the slack with a per unit voltage of $1.0 ∠ 0^{\circ}$ , bus 2 is a PQ bus with a per unit load of $2.0+j 0.5 $, and bus 3 is a PV bus with 1.0 per unit generation and a 1.0 voltage setpoint. The per unit line impedances are $j 0.1 $ between buses 1 and $2, j 0.4 $ between buses 1 and 3, and between buses 2 and 3. Using a flat start, use the Newton-Raphson approach to determine the first iteration phasor voltages at buses 2 and 3 .