A generator is connected to a large power system by a double circuit transmission line. Each line has a negligible resistance and a reactance of 0.2 p.u. The transient reactance of the generator is 0.8 p.u. and its inertia constant is 3 s. The large power system can be modeled as an infinite bus and the bus voltages are kept at their nominal value. Assume that single circuit faults on the transmission line are cleared in 120 ms. Using a transient stability program, calculate the maximum power that this generator can produce without risking instability. Use a 100 MW base. Repeat the calculations of Problem 5.4 for the case in which the generator is connected to the power system by two identical double circuit transmission lines.
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