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2003 Course Power System Operation & Control

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Total No. of Questions : 12] [Total No. of Pages : 3 [3864] - 221 P 1059 B.E. (Electrical) POWER SYSTEM OPERATION AND CONTROL (2003 Course) (403141) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answer any three questions from each section. 2) Answers to the two sections should be written in separate 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) b) Discuss with diagram the equal area criterion of stability for sudden increase in mechanical input to the generator. [10] Explain the effect of clearing time on stability of power system. Also discuss the concept of critical clearing angle and critical clearing time.[6] OR Q2) a) b) Q3) a) b) A 50 Hz, three phase synchronous generator capable of supplying 300 MW of power is connected to a large system and is delivering 120 MW when a three phase fault occurs at its terminals, determine [8] i) The time in which fault must be cleared, if the maximum power angle is to be 80o. Assume H = 10 MJ/MVA. ii) The critical clearing angle. Discuss the point by point method for solution to swing equation. [8] Explain the concept of Unit Commitment. Enlist the methods for Unit Commitment. [6] Discuss the dynamic programming method used for Unit Commitment. [10] OR Q4) a) b) Explain priority list method used for Unit Commitment. [8] Discuss various constraints in case of thermal and hydro generators.[8] P.T.O. Q5) a) Explain the concept of control area in case of single area system and two area system. [9] b) Explain with schematic diagram the speed governing system used for the turbogenerators. [9] OR Q6) a) Explain with the block diagram representation, the two area load frequency control. [10] b) Two generators rated 200 MW and 400 MW are operating in parallel. The droop characteristics of their governors are 4% and 5% respectively from no load to full load. Assume that generators are operating at 50 Hz at no load. How would load of 600 MW to be shared between them? Also assume the free governor action. [8] SECTION - II Q7) a) b) Explain with the functional block diagram the real time control of power system. [8] Explain the concept of real time monitoring of a power system. [8] OR Q8) a) Discuss functions of following load control centers. i) National load control center. ii) [8] Regional load control center. iii) State control center. iv) Area and local control center. b) Draw a neat block diagram schematic for a typical SCADA system. Explain function of each block. [8] Q9) a) Draw a loading capability curve of a synchronous generator and explain reactive power generation and absorption by the unit. [10] b) Explain static reactive power compensation system used for a power system. [8] OR [3864] - 221 -2- Q10)a) b) Q11)a) b) What is a series compensation? Explain the necessity of series compensation in the power system. What are the problems associated with the series compensation? [9] Discuss various types of FACTS controllers used for reactive power control. [9] Discuss advantages of interconnected power system. Explain economy interchange between interconnected utilities. [8] How interutility economy energy evaluation is carried out? Discuss the concept of interchange evaluation with unit commitment. [8] OR Q12)Write short notes on : a) Capacity Interchange. b) Diversity Interchange. c) Energy Banking. d) Inadvertent Power Exchange. [3864] - 221 -3- [16]

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