voltage - Calculation of Steady state power limit - Electrical Engineering Stack Exchange

I am confused with the above problem. I was thinking shouldn't we maximise \$\mid E\mid sin(\delta)\$ instead to get steady state power limit? \$\mid E\mid sin(\delta) = 1.8 sin(\theta)\$ maximum

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NUMERICAL ON STEADY STATE STABILITY LIMIT - 1

voltage - Calculation of Steady state power limit - Electrical Engineering Stack Exchange

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Schematic of steady-state methods commonly used for measuring the

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