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Posted By: kondapalli Member Level: Gold Posted Date: 05 Jun 2008
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2007 Jawaharlal Nehru Technological University B.Tech Electrical and Electronics Engineering POWER SYSTEM OPERATION & CONTROL setno1 Question paper
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1. (a) Explain how the incremental production cost of a thermal power station can
be determined.
(b) Explain the various factors to be considered in allocating generation to differ-
ent power stations for optimum operation. [8+8]
2. (a) Discuss and define the loss formula coefficients.
(b) What is the objective in economic scheduling? [8+8]
3. Explain how the load flow equations are solved using gauss-seidel method. [16]
4. (a) Derive the model of a speed governing system and represent it by a block
diagram.
(b) A 100 MVAsynchronous generator operates on full load at a frequency of 50
Hz. The load is suddenly reduced to 50 MW. Due to time lag in the governor
system, the steam valve begins to close after 0.4 secs. Determine the change
in frequency that occurs in this time. H=5 KW-s/KVAof generator capacity.
[8+8]
5. (a) Explain the concept of “control area” in the load frequency control of a power
system.
(b) Show how the steady state error of frequency in a typical load frequency control
of a power system is reduced to zero. [8+8]
6. Give a typical block diagram for a two-area system inter connected by a tie line and
explain each block. Also deduce relations to determine the frequency of oscillations
of tie line power and static frequency drop. List out assumptions made. [16]
7. (a) Write short notes on compensated and uncompensated transmission lines
(b) Explain briefly about the shunt and series compensation of transmission sys-
tems. [8+8]
8. What is load compensation? Discuss its objectives in power system. [16]
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