Question: Power systems A and B are connected via a tie line. The tie line carries 1,000 MW from system A to System B and the

Power systems A and B are connected via a tie line. The tie line carries 1,000 MW from system A to System B and the interconnected system operates at 50 Hz. After the outage of the tie line, the frequency in System A increases to 50.5 Hz and the frequency in system B decrease to 49 Hz. Calculate the stiffness of each system.

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