Advanced Power Systems-Tutorial-5.pdf - EEET2403 Advanced Power Systems Tutorial 5 Transient Stability-2 Question 1 A two-pole 50 Hz 100 MVA generator

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1 AV /2018 EEET2 403 Advanced Power Systems Tutorial 5: Transient Stability-2 Question 1 A two-pole, 50 Hz, 100 MVA generator has a transient reactance X’ of 0.15 pu and an inertia constant, H of 3.5 seconds. The generator terminal is connected to an infinite bus at 1.0 0 o pu voltage via a transmission network as shown in Fig.Q1. All the pu values given are based on 100 MVA and 20 kV/220 kV. Under a steady operating condition, the generator supplies 80 MW to the system with an internal excitation voltage E’ of 1.12 pu. A three phase to ground fault occurs in the transmission network at time t = 0 and after some time the fault is cleared by tripping the faulted link in the system. The system then goes into a different post-fault condition. The equivalent transfer reactance X trf of the transmission network between the generator terminal and the infinite bus changes under various conditions as follows: X trf is 0.35 pu under pre-fault steady state condition . X trf is 1.85 pu under fault condition . X trf is 0.60 pu under post-fault condition . (a) Calculate the initial angle δ 0 of the generator internal voltage. [Ans. 0.365 rad] (b) Calculate the maximum power transfer possible under the pre-fault, fault and post-fault conditions. [Ans. 2.24 pu, Ans. 0.56 pu & Ans. 1.493 pu] (c) Sketch the power – rotor angle (P-

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