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2003 Course Power System Operation & Control

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Total No. of Questions : 12] P1337 [Total No. of Pages : 2 [3764]-201 B.E. (Electrical) 403141 : POWER SYSTEM OPERATION AND CONTROL (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidate: 1) Answer any three questions from each section. 2) Answers to the two sections should be written in separate answer books. 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full marks. 5) Use of logarithmic tables slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. SECTION - I Q1) a) State and derive the swing equation. [8] b) A double circuit line feeds an infinite bus from a power station. If a fault occurs on one of the lines and the line is switched off, derive an expression for the critical clearing angle. [8] OR Q2) a) Explain the terms: [8] i) Critical clearing angle and ii) Critical clearing time. Derive an expression for the critical clearing angle for a power system consisting of a single machine supplying to an infinite bus, for a sudden load increment. [8] b) Q3) a) b) Q4) a) b) Explain the term 'Unit Commitment'. Discuss dynamic programming method of Unit Commitment. [8] Discuss thermal and hydro constraints used for Unit Commitment.[8] OR Explain priority list method of Unit Commitment. [8] Discuss the concept of spinning reserve. [8] P.T.O. 1 Q5) a) b) Q6) a) b) Discuss the concept of Automatic Generation and Control. [9] Draw a neat sketch, and explain complete block diagram representation of load-frequency control of an isolated power system. [9] OR Discuss the effect of speed governor dead band on automatic generation and control. [9] Write a short note on Digital Load Frequency Controller. [9] SECTION - II Q7) a) Discuss the concept of real time data processing using state estimation.[8] b) Draw a neat sketch, and discuss the basic principle of operation of Supervisory Control And Data Acquisition System. [8] OR Explain the basic principle of centralized and decentralized energy [8] control centers. Q8) a) b) Q9) a) b) Q10)a) b) Q11)a) b) Explain the functions of telemetering unit and data logging unit used for real time control of power system. [8] Discuss the basic principle of operation of FACTS controller. [8] Draw a neat sketch of loading capability curve and explain basic principle of operation of synchronous generator. [8] OR Discuss various schemes of static Var compensation of a power system. [8] Explain the term Sub-synchronous resonance. [8] Explain the term power pools of a power system. [9] Explain the basic principle of energy banking. [9] OR Q12)Write short notes on. a) Interchange of power between interconnected utilities. b) Economy interchange evaluation. c) Capacity and diversity interchange. [3764]-201 2 -2- [6] [6] [6]

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