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16 a)

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F1055 Pages: 3

PART D
Answer any two full questions, each carries 10 marks.

Assume that the fuel input Btu/hr for units 1 and 2 are given by

10° )80+ 0.0247017+ ,82( = رط

Fp = (6P2 0.04 +120) 10°
The maximum and minimum loads on the units are 100۸1۷۷ and 1OMW
respectively. Determine the minimum cost of generation when the following load
is supplied. The cost of fuel is Rs~2/million Btu.

|.

501/1// | |.

1

What is the significance of spinning reserve constraint in unit commitment
problem? Explain with example.

Explain the equal area criterion to determine the stability of a power system
Derive the swing equation.

A 2 pole 50 Hz, 11kV turbo generator has a rating of 60 MW at 0.85 p.f lagging.
Its rotor has a moment of inertia of 8800 kg-m?. Calculate its inertia constant in

MJ/MVA and its angular momentum in MJ-s/elect. Degree.

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