Write a MATLAB script to plot a set of per-unit power-angle curves for a salient-pole synchronous generator connected to an infinite bus (V _bus = 1.0 per unit). The generator reactances are X_d = 1.27 per unit and X_q = 0.95 per unit. Assuming Eaf = 1.0 per unit, plot the following curves:

a. Generator connected directly to the infinite bus.

b. Generator connected to the infinite bus through a reactance X _bus = 0.1 per unit.

c. Generator connected directly to the infinite bus. Neglect saliency effects, setting X_q = X_d.

d. Generator connected to the infinite bus through a reactance X _bus = 0.1 per unit. Neglect saliency effects, setting X_q = X_d.