PowerWorld Simulator case Problem 11_27 duplicates the system from Problem 11.24, except the generators are modeled using a two-axis model, with the same \(\mathrm{X}_{d}^{\prime}\) and \(\mathrm{H}\) parameters as are in Problem 11.24. Compare the critical clearing time between this case and the Problem 11.24 case.

Problem 11.24

Open PowerWorld Simulator case Problem 11_24, which models the Example 6.9 with transient stability data added for the generators. Determine the critical clearing time (to the nearest 0.01 second) for a fault on the line between buses 4 and 5 at the bus 4 end which is cleared by opening the line.

3 Q = 2.0 B13 X1 = 0.20 H. = 25.0 B31 B11 ine 3 X3 = 0.10 B12 line 5 X = 0.025 B32 P = 3.0 X3 = 0.10 H= 3.0 line X. = 0.05 B51 P = 1.0 G 0 = 0.3 B61 6 B52 B53 B62 line 4 X = 0.025 Qu - 0.9 I'ne 6 X, = 0.05 622 X = 0.10 11,= 6.C B41 B21 line 2 X = 0.10 2 B23 342 4 P = 2.0