Code No: 09A70204

JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

B. Tech IV Year I Semester Examinations, May/June - 2013Power System Operation and Control

(Electrical and Electronics Engineering)

Time: 3 Hours Max. Marks: 75

Answer any Five Questions

All Questions Carry Equal Marks

- - -

1.a) Explain about (i)Generator constraints (ii)Voltage constraints (iii)Transmission

line constraints and (iv)Transformer tap settings in view of the economical load

dispatch problem.

b) Incremental fuel costs in Rs/MWh for two units in a plant are given by:

dF1/dP1=0.1 P1+20 and dF2/dP2=0.12 P2+16. The minimum and maximum loads

on each unit are to be 25 MW and 120 MW respectively. Determine the

incremental fuel cost and the allocation of load for the minimum cost when loads

are i) 90 MW and (ii) 140 MW. [7+8]

2.a) Develop an algorithm and draw the flow chart for the solution of coordination

equations.

b) The incremental fuel costs in Rs/MWh for two plants are given by:

dF1/dP1=0.03 P1+16 and dF2/dP2=0.050 P2+12. The loss coefficients of the

system are given by B11=0.005 , B12=-0.0012 and B22=0.002. The load to be met

is 190 MW. Determine the economic operating schedule and the corresponding

cost generaton if the transmission lines are included but not coordinated. [7+8]

3. Explain in detail about the optimal operation of hydro-thermal system. [15]

4.a) Obtain the small signal transfer function and thereby draw the block diagram of

fly ball speed governing system used in thermal power plants.

b) With the help of a neat schematic diagram, obtain the transfer function of IEEE

type-1 excitation system. [7+8]

5.a) What is the effect of change in frequency on (i) impedance load and (ii)induction

motor loads.

b) Obtain the dynamic response (uncontrolled case) of an isolated power system.

c) Two generators rated at 120 MW and 250 MW are operating in paralle.The

generator settings on the machines are such that they have 4 percent and 3 percent

drops. Determine (i) the load taken by each machine for a total load of 200 MW.

[15]

6. From the fundamentals obtain the transfer function of a two-area controlled power

system network and also draw the corresponding block diagram. [15]

R09

) The incremental fuel costs in Rs/MWh for two plants are given by:

+16 and dF2/dP

system are given by B11=0.005 , B12

is 190 MW. Determine the economic ope

cost generaton if the transmission lines

3. Explain in detail about the optimal operation of hydro-thermal system. [15]

4.a) Obtain the small signal transfer functi

fly ball speed governing system used in thermal power plants.

incremental fuel cost and the allocation of

are i) 90 MW and (ii) 140 MW. [7+8]

) Develop an algorithm and draw the flow chart for the solution of coordination

) The incremental fuel costs in Rs/MWh for two plants are given by:

=0.050 P2+12. The loss coefficients of the

=-0.0012 and B

) The incremental fuel costs in Rs/MWh for two plants are given by:

+16 and dF /dP

system are given by B =0.005 , B12

is 190 MW. Determine the economic ope

cost generaton if the transmission lines

operation of hydro-thermal system. [15]

4.a) Obtain the small signal transfer functi

fly ball speed governing system used in thermal power plants.

is 190 MW. Determine the economic ope

cost generaton if the transmission lines

3. Explain in detail about the optimal

incremental fuel cost and the allocation of

are i) 90 MW and (ii) 140 MW. [7+8]

) Develop an algorithm and draw the flow chart for the solution of coordination

) The incremental fuel costs in Rs/MWh for two plants are given by:

=0.050 P +12. The loss coefficients of the

=-0.0012 and B

is 190 MW. Determine the economic ope

cost generaton if the transmission lines

3. Explain in detail about the optimal

4.a) Obtain the small signal transfer functi

11=0.005 , B

is 190 MW. Determine the economic ope

cost generaton if the transmission lines

3. Explain in detail about the optimal

) Develop an algorithm and draw the flow

) The incremental fuel costs in Rs/MWh for two plants are given by:

=0.050 P2+12. The loss coefficients of the

motor loads. motor loads.

agram, obtain the transfer function of IEEE agram, obtain the transfer function of IEEE agram, obtain the transfer function of IEEE agram, obtain the transfer function of IEEE b) With the help of a neat schematic dib) With the help of a neat schematic dib) With the help of a neat schematic dib) With the help of a neat schematic diagram, obtain the transfer function of IEEE

on and thereby draw the block diagram of on and thereby draw the block diagram of on and thereby draw the block diagram of on and thereby draw the block diagram of 4.a) Obtain the small signal transfer functi4.a) Obtain the small signal transfer functi4.a) Obtain the small signal transfer functi4.a) Obtain the small signal transfer functi

operation of hydro-thermal system. [15] operation of hydro-thermal system. [15] operation of hydro-thermal system. [15] operation of hydro-thermal system. [15] operation of hydro-thermal system. [15] operation of hydro-thermal system. [15] 3. Explain in detail about the optimal 3. Explain in detail about the optimal 3. Explain in detail about the optimal 3. Explain in detail about the optimal 3. Explain in detail about the optimal 3. Explain in detail about the optimal 3. Explain in detail about the optimal

are included but not coordinated. [7+8] are included but not coordinated. [7+8] are included but not coordinated. [7+8] are included but not coordinated. [7+8] cost generaton if the transmission lines cost generaton if the transmission lines cost generaton if the transmission lines cost generaton if the transmission lines cost generaton if the transmission lines cost generaton if the transmission lines cost generaton if the transmission lines

=0.002. The load to be met =0.002. The load to be met 22=-0.0012 and B=-0.0012 and B=0.005 , B=0.005 , Bsystem are given by Bsystem are given by Bsystem are given by Bsystem are given by B =-0.0012 and B =0.002. The load to be met =-0.0012 and B=-0.0012 and B

) The incremental fuel costs in Rs/MWh for two plants are given by: ) The incremental fuel costs in Rs/MWh for two plants are given by: ) The incremental fuel costs in Rs/MWh for two plants are given by: ) The incremental fuel costs in Rs/MWh for two plants are given by: ) The incremental fuel costs in Rs/MWh for two plants are given by: ) The incremental fuel costs in Rs/MWh for two plants are given by: ) The incremental fuel costs in Rs/MWh for two plants are given by: ) The incremental fuel costs in Rs/MWh for two plants are given by: ) The incremental fuel costs in Rs/MWh for two plants are given by: ) The incremental fuel costs in Rs/MWh for two plants are given by: b) The incremental fuel costs in Rs/MWh for two plants are given by:

chart for the solution of coordination chart for the solution of coordination chart for the solution of coordination ) Develop an algorithm and draw the flow chart for the solution of coordination ) Develop an algorithm and draw the flow) Develop an algorithm and draw the flow) Develop an algorithm and draw the flow) Develop an algorithm and draw the flow2.a) Develop an algorithm and draw the flow) Develop an algorithm and draw the flow chart for the solution of coordination

are i) 90 MW and (ii) 140 MW. [7+8] are i) 90 MW and (ii) 140 MW. [7+8] are i) 90 MW and (ii) 140 MW. [7+8] are i) 90 MW and (ii) 140 MW. [7+8] are i) 90 MW and (ii) 140 MW. [7+8] are i) 90 MW and (ii) 140 MW. [7+8]

on each unit are to be 25 MW and 120 MW respectively. Determine the on each unit are to be 25 MW and 120 MW respectively. Determine the

a plant are given by: Wh for two units in a plant are given by: Wh for two units in b) Incremental fuel costs in Rs/MWh for two units in b) Incremental fuel costs in Rs/M

the economical load the economical load ttings in view of the economical load ttings in view of line constraints and (iv)Transformer tap seline constraints and (iv)Transformer tap seline constraints and (iv)Transformer tap seline constraints and (iv)Transformer tap seline constraints and (iv)Transformer tap se

All Questions Carry Equal Marks All Questions Carry Equal Marks All Questions Carry Equal Marks All Questions Carry Equal Marks

Time: 3 Hours Max. Marks: 75 Time: 3 Hours Max. Marks: 75 Time: 3 Hours Max. Marks: 75 Time: 3 Hours Max. Marks: 75 Time: 3 Hours Max. Marks: 75 Time: 3 Hours Max. Marks: 75 Time: 3 Hours Max. Marks: 75 Time: 3 Hours Max. Marks: 75 Time: 3 Hours Max. Marks: 75

Examinations, May/June - 2013Examinations, May/June - 2013Power System Operation and Control

Examinations, May/June - 2013Power System Operation and Control Power System Operation and Control Power System Operation and Control

OGICAL UNIVERSITY HYDERABAD OGICAL UNIVERSITY HYDERABAD OGICAL UNIVERSITY HYDERABAD OGICAL UNIVERSITY HYDERABAD JAWAHARLAL NEHRU TECHNOLJAWAHARLAL NEHRU TECHNOLJAWAHARLAL NEHRU TECHNOLJAWAHARLAL NEHRU TECHNOL

R09

on and thereby draw the block diagram of

=0.002. The load to be met

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7.a) Obtain the steady state response of a single area controlled power system network

for the following situations (i) without proportional plus integral controller and

(ii) with proportional integral controller.

b) What is meant by load frequency control and economic dispatch control power

system network? With the help of a neat block diagram, explain the operation of

frequency controlled and economic dispatch controlled power system network.

[8+7]

8.a) Why does the operating voltage level of a power system network changes? Write

the effect of change in voltage level of a power system network on induction

motors.

b) Mention different types of reactive power compensation techniques used in power

system.

c) Distinguish between the shunt and series compensators used in the operation of a

power system network.

d) Write short notes on compensated transmission lines. [15]

--ooOoo----ooOoo----ooO--ooOoo--

sated transmission lines. [15] sated transmission lines. [15] sated transmission lines. [15] sated transmission lines. [15] sated transmission lines. [15] d) Write short notes on compen d) Write short notes on compen d) Write short notes on compen

compensators used in the operation of a compensators used in the operation of a compensators used in the operation of a compensators used in the operation of a c) Distinguish between the shunt and series compensators used in the operation of a c) Distinguish between the shunt and seriesc) Distinguish between the shunt and seriesc) Distinguish between the shunt and seriesc) Distinguish between the shunt and series

wer compensation techniques used in power wer compensation techniques used in power wer compensation techniques used in power wer compensation techniques used in power wer compensation techniques used in power b) Mention different types of reactive pob) Mention different types of reactive pob) Mention different types of reactive pob) Mention different types of reactive po

the effect of change in voltage levethe effect of change in voltage levethe effect of change in voltage level of a power system network on induction l of a power system network on induction l of a power system network on induction l of a power system network on induction l of a power system network on induction the effect of change in voltage leve

ch controlled power system network. ch controlled power system network. ch controlled power system network. frequency controlled and economic dispatch controlled power system network. frequency controlled and economic dispatfrequency controlled and economic dispatfrequency controlled and economic dispatfrequency controlled and economic dispat

rol and economic dispatch control power rol and economic dispatch control power rol and economic dispatch control power rol and economic dispatch control power b) What is meant by load frequency control and economic dispatch control power b) What is meant by load frequency contb) What is meant by load frequency contb) What is meant by load frequency contb) What is meant by load frequency cont

e area controlled power system network

ional plus integral controller and

e area controlled power system network

ional plus integral controller and

e area controlled power system network

ional plus integral controller and

e area controlled power system network

proportional plus integral controller and

7.a) Obtain the steady state response of a single area controlled power system network

for the following situations (i) without proport

7.a) Obtain the steady state response of a singl

for the following situations (i) without

7.a) Obtain the steady state response of a singl

for the following situations (i) without

7.a) Obtain the steady state response of a singl

for the following situations (i) without

7.a) Obtain the steady state response of a singl

for the following situations (i) without

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