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Roll No. ......................Total No. of Questions: 08] [Total No. of Pages: 03M.Tech.

ADVANCED POWER SYSTEM ANALYSISSUBJECT CODE: ELE -502

Paper ID :,[E0522][Note: Please till subject code and paper ID on OMR]Time: 03 Hours

Instruction to Candidates:1) Attempt any Five questions.2) All questions carry equal marks.

Maximum Marks: 100

01) (a) Discuss the formation of bus admittance matrix using step-by-stepmethod.(b) A power system appears in a bridged T-network form as shown in Fig 1.formulate Y bus for the system. Values shown one admittances in thenetwork. -J ''Fig 1 for Q.1(b) 1

VIQ2) (a).

(b) Explain sparsity technique and optim~l ordering.Fig 2 is a 4-bus power system in which line admittances are as follows:

bus code admittance .~ 2f - 1i-2 (2-j8) F:~ ~ .= .,f1 ~ . ~d~21-3 (l-j4) ,-yI- t~ I-J4-2-3 0.666 - j2.664 ~ Y ~ 4-. ~ g . :O-3rJ

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r .~

Q3) (a)(b)

What is load flow studies and discuss Gauss-Seidel power flbWsolution.Fig 3 shows I-line diagram of a simple 3-bus power system withGeneration at Bus 1. The magnitude of voltage at bus 1 is adjusted to1.05 pu. The scheduled loads at buses 2 and 3 are shown in the diagram.Line impedances are marked in pu on 100 MVA base and the linecharging susceptances are neglected.(i) Use G.S-method to obtain values of voltage at bus 2 bus 3.(ii) Find the slack bus real and reactive power.

.i . 2 2~.6.~wG I

S/~bvJ,-o 3 /Vi :: /.as . ~/ 8 f :. c 4-::;.2-}4N J.I}{/t(fFIG.3 ~_llfV d ~ f I~

Q4) (a) Give details of Z bus - formulation for load flow solution.(b) Compare G.S, NR and Fast decoupled power flow methods of loadflow solution.

Q5) Discuss balanced three-phase fault. The single-line diagram of a simple 3-ph. power system is shown in Fig 4. Each generator is represented by anemf behind the transient reactance. impedances in pu are on a common base100 MVA with resistances neglected. The following assumptions are made(a) Shunt capacitances are neglected system is on not load.(b) All generators are running at their rated voltages rated frequency

with their emfs in phase obtainThe fault current, bus voltages and the line currents during the faultwhen a balanced 3-ph. Fault with Zr =0.16 pu occurs on bus-3.

~~/G4 A; .clr~'~.Sj k p.:y.s.l ir~ ~

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Q Discuss symmetrical component analysis. of unsymmetrical faults. How isfault computation done using Z bus formulation.Q7 Discuss state Estimation of power systems with measurements available on

line. How is least squares estimation gives the basic solution discuss.Q8 Write short notes on :

a Improvement in state estimates by adding measurements.b Algorithm formation of 3-ph Z bus

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