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POWER SYSTEMS

Power Systems
A 100 MVA alternator operating at full load at 50 Hz. H = 4 MWsec/MVA, Td = 0.5 sec. One of the transmission line is tripped. So that output of generator is reduced to 70 MW. Find the frequency deviation during this time?

 -0.92
 0.92
 0.56
 -0.56

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Power Systems
In which of the following frequency control method tie line may be overloaded?

 flat frequency control
 flat tie line control
 parallel frequency
All of these

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Power Systems
The equation of area control error(ACE) is

 ACE = ΔPtie +1/ b.Δf
 ACE = ΔPtie + b.Δf
 ACE = ΔPtie - 1/b.Δf
 ACE = ΔPtie - b.Δf

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Power Systems
Power system network has a total power of 5000 MW at 50 Hz supplying to the different consumers. Frequency is varying at 1.5% per change of 2% load. Assume R =0.004 Hz/MW. Find the steady state frequency deviation if a sudden loss of 200 MW occur due to tripping of one of the transmission line?

 0.48 Hz
 50 Hz
 0.52 Hz
 -0.52 Hz

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Power Systems
Units of incremental cost is

 RsMW/hr
 MWhr/Rs
 Rs/MWhr
 Rs/hr

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