Download PTU M.Tech. EE 2nd Semester 71369 POWER SYSTEM DYNAMICS AND STABILITY Question Paper

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Total No. of Pages : 02

Total No. of Questions : 08

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M.Tech.(Power System) (2013 & Onwards) (Sem.-2)

POWER SYSTEM DYNAMICS AND STABILITY

Subject Code : MTPS-203

M.Code: 71369

Time: 3 Hrs.

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Max. Marks : 100

INSTRUCTIONS TO CANDIDATES :

1. Attempt any FIVE questions out of EIGHT questions.
2. Each question carries TWENTY marks.
3. Assume any missing data appropriately.

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Q1. (a) State and explain angular and load stability of power system. (10)

(b) What is the necessity of steady state stability and how is this evaluated? (10)

Q2. (a) Draw and explain the generator capability curve. Label the diagram indicating various limitations on the generation of active and reactive power, and stability limits. (10)

(b) Explain dynamic modeling of synchronous motors using d-q axis transformation. (10)

Q3. (a) Explain the significance of first swing stability of generators. Draw a Power-angle curve and explain the Equal Area Criterion. (10)

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(b) A generator is delivering 1.0 pu power to an infinite bus through a network having negligible resistance, at 50Hz. A fault occurs which reduces the maximum power transferable to 0.45 pu, whereas before the fault this power was 1.85 pu and after the clearance of fault it is 1.25 pu. Using the equal area criterion, determine the critical clearing angle. (10)

Q4. (a) Explain the term “Dynamic Stability” as applied to power system. (08)

(b) In a SMIB system having Re = 0, Xe = 0.5pu, Vt = 1.0 ? 15°, V8 = 1.08 ?0° The machine parameters H = 3.2sec, To = 9.6sec, KA = 200, Ta = 0.25sec, Rs = 0.0, Xq = 1.7pu, Xd = 2.0pu, X' = 0.39pu, D = 0, ? = 100p. Using flux decay model, find initial values of state and algebraic variables, as well as Vref, TM. (12)

Q5. (a) Draw a model of SMIB Power System using K1 to K6 Constants, give reasons for assuming constant mechanical power. Write expression for six constants used. (10)

(b) Draw a block diagram of Power system stabilizer and explain lag-lead time-constants, wash-out gain and wash-out time constant? (10)

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Q6. (a) Define proximity indices used for voltage stability of power system. (10)

(b) For a two area power system determine the voltage stability with the following data:

Show the undesired control action occurs with B = 2ß. (10)

Q7. (a) Define and explain Voltage Stability of Power System with the help of the P-V curve. (10)

(b) Explain how resonance can occur in power system. What are its effects on power system apparatus? (10)

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Q8. (a) What are the problems caused by self excitation and how can these be overcome using filters and damping devices. (10)

(b) Write short notes on:

1. Methods to counteract the sub synchronous oscillations. (5)
2. Voltage stability using Bifurcation theory. (5)

NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any page of Answer Sheet will lead to UMC against the Student.

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