Pune University BE Electrical Power System Operation and Control Question Papers

Pune University BE Electrical Power System Operation and Control

Question Papers

B.E. (Electrical) POWER SYSTEM OPERATION AND CONTROL (2008 Pattern) (Sem. – I)

Time : 3 Hours]                                                                         [Max. Marks : 100

Instructions to the candidates:

1)         Answer any three questions from each section.

2)         Answers to the two sections should be written in separate books.

3)          Neat diagrams must be drawn wherever necessary.

4)          Pigures to the right indicate full marks.

5)           Use of electronic pocket calculator and steam tables is allowed.

SECTION – I

QI) a) Explain following terms:                                                                                          [9]

i)              Steady state stability.

ii)           Transient stability.

iii)         Dynamic stability.

b) Draw a plot of power angle verses time for stable as well as unstable system. Explain the concept of equal area criterion applied to power system stability.          [9]

OR

Q2) a) Derive an expression for the critical clearing angle for a power system consisting of a single machine supplying to an infinite bus, for three phase short circuit fault occurred close to generator bus.                                                                                                      [9]

b) Explain ‘point by point method’ for the solution of swing equation. [9]

Q3) a) Explain reactive power generation by synchronous machine. Explain the loading capability of a synchronous generator.                                                                           [10]

b) Write a note on static compensation schemes for reactive power control.

[T]

 

Q4) a) Explain various types of FACTs controllers used for reactive power control. [10]

b) Describe the effect of connecting series capacitors in the transmission system. [6]

Q5) a) Write brief note on Sub asynchronous resonance.                           [8]

b) Explain Unified Power Flow Controller (UPFC) with diagram. [8]

OR

Q6) a) Explain the principle of working of static compensator (STATCOM).

State the advantages and applications of STATCOM.                                [8]

b) Explain the principle of operation of Thyristor Controlled Series Capacitors (TCSC) with its advantages.                                                                                             [8]

SECTION – II

Q7) a) What is Automatic Generation Control (AGC). Explain with block diagram the working of proportional plus integral load frequency controller for an isolated power system.                                                                                            [10]

b) Write short note on :                                                                                             [6]

i)              Speed governing model.

ii)           Turbine model.

iii)         Generator-load model.

OR

Q8) a) With neat block diagram explain two area load frequency control. Also explain the concept of Area Control Error (ACE).                                      [10]

b) Explain the effect of speed governor dead band on automatic generation control.         [6]

Q9) a) Define unit commitment and explain following concepts with reference to Unit Commitment.                                                                                 [10]

i)             Minimum up time, Minimum down time.

ii)           Fuel constraint.

iii)        Must run.

iv)         Hydro-constraint.

b)        State various methods of unit commitment and explain ‘priority list method’ of unit commitment with example.                                                                              [8]

 

QI 0) a) Explain with mathematical formulation, the economic load dispatch with transmission loss and including equality constraint of meeting load. [12]

b)        Explain the heat rate curve and cost curve of a thermal generating unit. [6]

QII) Out of following, explain any four types of power interchange.                       [16]

a)        Energy banking.

b)        Capacity interchange.

c)        Diversity interchange.

d)        Emergency power interchange.

e)        Inadvertent power exchange.

OR

Q12) Write short note on :                                                                                                [16]

a)        Power Pools.

b)        Interchange evaluation with unit commitment.

c)        Multi utility Interchange transactions.

d)        Inter utility economy energy evaluation.

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