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Total No. of Pages : 02
Roll No.
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Total No. of Questions : 8
M.Tech.(EE) (2018 Batch) (Sem.–1)
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POWER SYSTEM DYNAMICS-I
Subject Code : MTEE-102-18
M.Code : 75216
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Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS TO CANDIDATES :
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- Attempt any FIVE questions out of EIGHT questions.
- Each question carries TWELVE marks.
- Assume any missing data appropriately
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- a) Explain dis-advantages of per unit system of parameter measurement. (6)
- b) Prove by Power Invariance upon transformation from three axis to two axis? (6)
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- a) Derive an expression for transformer and speed voltages developed in the armature of a two pole DC machine. (6)
- b) Describe physical concept of Park's Transformation. (6)
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- a) Write state-space model of synchronous motor using d-q axis theory. (6)
- b) Explain connection matrix [C] used in Park's transformation. (6)
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- a) Classify the power system disturbances occurring as small signal and large signal. (6)
- b) What is the purpose of power system stabilizer, and also explain its functioning with the help of blocks? (6)
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- Draw and explain block diagram of SMIB considering effects of synchronous machine field circuit dynamics. (12)
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- a) Draw and explain induction motor equivalent circuit from steady state stability point of view. (6)
- b) Explain the synchronous generator excitation control methods employed. (6)
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1| M-75216 (S35)-2334
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- Figure below shows the single line diagrams of thermal generating station consisting of four 555MVA, 24kV, 60Hz units. (12)
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Generator L.T. H.T. j0.5 Infinite Bus
G Xd' = 0.3 j0.15
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2 3 P = 0.9, Et = 1.0/36°
Q = 0.3 (over excited)
H = 3.5 MW-s/MVA j0.93
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1 ?B = 0.920°
Fig.1 Single line diagram of SMIB
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The post fault condition in per unit on the 2220MVA, 24kV base is as given below :
| Parameter | Value | Parameter | Value | Parameter | Value |
|---|---|---|---|---|---|
| Xq | 1.81 | Xdo | 8.0 | P | 0.9 |
| X"d | 1.76 | H | 3.5 MW-s/MVA | Q | 0.3 (overexcited) |
| KD | 0.3 | KD | 0,10,-10 | ET | 1.0/36° |
| X"q | 0.16 | Ra | 0.003 | Ed | 0.995/0° |
If the generators are to be modeled as a single equivalent generator represented by the classical model. Write the linearized state equation of the system. Determine the eigenvalues, left and right eigen vectors, and participation matrix for KD-10 damping coefficient (in pu torque/pu speed).
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- The following parameters are in per unit on machine rating of a 555MVA, 24kV, 0.9 p.f. 60Hz, 3600 rpm turbine-generator :
Lad 1.66 Laq 1.61 L1 0.15 Ra 0.003
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Lfd 0.165 Rfd 0.0006 L1d 0.1713 Rid 0.0284
L1q 0.7252 R1q 0.00619 L2q 0.125 R2q 0.02368
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Lfkd is assumed to be equal to Lad
When the generator is delivering rated MVA at 0.9 pf(lag) and rated terminal voltage, compute the following :
a) The Internal angle 81 in electrical degrees. (6)
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b) Per unit values of ed, eq, id, iq, i1d, i1q, i2q, ifd, efd (6)
Assume that the effect of magnetic saturation at the given operating condition is to reduce Lad and Laq to 80% of the values given above.
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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.
2 | M-75216 (S35)-2334
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This download link is referred from the post: PTU M.Tech 1st Semester Last 10 Years 2010-2020 Previous Question Papers|| Punjab Technical University
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