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- Power System Operation and Control - PSOC
- 2018
- PYQ
**Biju Patnaik University of Technology Rourkela Odisha - BPUT**- Electrical Engineering
- B.Tech
**2665 Views**- 38 Offline Downloads
- Uploaded 11 months ago

Registration No : Total Number of Pages : 02 B.Tech PCEL4401 7th Semester Back Examination 2018-19 POWER SYSTEM OPERATION AND CONTROL BRANCH : EEE, ELECTRICAL Time : 3 Hours Max Marks : 70 Q.CODE : E263 Answer Question No.1 which is compulsory and any FIVE from the rest. The figures in the right hand margin indicate marks. Q1 a) b) c) d) e) f) g) h) i) j) Q2 (2 x 10) Answer the following questions : What do you mean by unit commitment? What are the objectives of AVR in an interconnected system? A single-phase inductive load draws 10 MW at 0.6 power-factor lagging. Determine the reactive power of a capacitor to be connected inparallel with the load to raise the power factor to 0.85. Draw and explain the input-output curve and heat rate curve of a power plant? Which method of power flow solution shall be preferred? Justify your answer. What is single area system? What do you mean by ALFC? Write a brief note about speed governing system? Briefly explain about steady state stability limit. The reactance of a generator ( X” ) is given as 0.5 per unit based on the generator name plate rating of 33 kV, 100 MVA. Find ( X” ) at a base of 66 kV, 200 MVA. a) A balanced DELTA load consisting of pure resistances of 15 ohm per phaseis in parallelwith a balanced STAR load having phase impedances of 8 + j6 ohm. Identical impedancesof 2 + j5 ohm are in each of the three lines connecting the combined loads to a 110 V three -phase supply. Find the current drawn from the supply and line voltage at the combined loads. b) Form YBUS for a 4-bus system if the line series impedances and total shunt admittances are as under: From Bus 1 1 1 2 3 Q3 To Bus 2 3 4 3 4 Impedance 0.15 + j0.6 p.u. 0.1 + j0.4 p.u. 0.15 + j0.6 p.u. 0.05 + j0.2 p.u. 0.05 + j0.2 p.u. (5) (5) Total shunt admittance j 0.08 p.u. j 0.08 p.u. j 0.08 p.u. - a) Develop an algorithm for power flow using Newton Raphson method. Draw the flow chart for calculation. (5)

b) The following is the system data for a load flow solution. The line admittances : Bus code 1-2 1-3 2-3 2-4 3-4 (5) Admittance 2 – j8 1-j4 0.666-j2.664 1-j4 2-j8 The scheduled of active and reactive power : Bus code 1 2 3 4 P 0.5 0.4 0.3 Q 0.2 0.3 0.1 V 1.06 1+j0 1+j0 1+j0 Remarks Slack PQ PQ PQ Determine the voltages at the end of first iteration using G-S Method. Take 1.6 Q4 a) Derive the equation of incremental fuel cost for distribution of load between K number of generating stations. b) A generating station has two units having incremental fuel cost as below dF1 dF 0.05 P1 35, and , 2 0.15 P1 42 dP2 dP2 Determine the economic load sharing between two generators for a total load of 250 MW. Calculated the saving in cost if two units shared equal loads. Consider cost of power as Rs 25 per MWh. (5) Q5 a) Give a concept of power pool and list out its advantages. b) Two turbo alternators rated for 110 MW and 210 MW have governor drop characteristics of 5% from no load to full load. They are connected in parallel to share a lad of 250 MW. Determine the load shared by each machine assuming free governor action. (5) (5) Q6 a) Write a brief note about applications of the equal area criterion. b) A turboalternator with 4-pole, 50 Hz, 80 MW, p.f. 0.8 lag and moment of inertia 40,000 kgm2 isinterconnected via a short transmission line to another alternator with 2-pole, 50 Hz, 100 MW,p.f. 0.8 lag and moment of inertia 10,000 kgm2. Determine the inertia constant and angular momentum of the singleequivalent machine on a base of 100 MVA. (5) (5) Q7 Derive the swing equation of a synchronous machine connected to infinite bus and mention the factors affecting transient stability. (10) Q8 Write short answer on any TWO: economic dispatch control. Static Response of PrimaryALFC Loop. Tie-line bias control of two area system. RegulatingTransformer. a) b) c) d) (5) (5 x 2)

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