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2003 Course Power System Operation & Control

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Total No. of Questions : 12] [Total No. of Pages : 3 P1156 [3664]-178 B.E. (Electrical) POWER SYSTEM OPERATION AND CONTROL (2003 Course) (403141) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates:1) Answer any 3 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) Explain equal area criterion for power system stability. [9] Discuss the importance of critical clearing angle and critical clearing time for power system stability. Derive the expression for critical clearing time in terms of critical clearing angle. [9] OR Q2) a) Explain the solution of swing equation by point by point method. [9] b) A 150 MVA, 13.8 kV, 50Hz, 4 pole turbogenerator has an inertia constant of 8 MJ / MVA. [9] i) Find the stored energy in the rotor at synchronous speed. ii) The machine is operating at a load of 80 MW and the load suddenly increases to 100 MW. Find the rotor retardation. Neglect losses. iii) The retardation calculated above is maintained for 5 cycles. Find the change in the power angle and rotor speed in rpm at the end of this period. Q3) a) What is unit commitment? Explain priority list method of unit commitment. [10] Explain the concept of spinning reserve and thermal units constraints used for commitment. [6] b) P.T.O. OR Q4) a) b) Explain dynamic programming method used for unit commitment.[10] Discuss hydro constraints and nonconventional energy sources constraints used for unit commitment. [6] Q5) a) Draw complete block diagram representation of load frequency control and discuss the concept of Automatic generation and control. [8] With complete block diagram explain proportional plus integral load frequency control along with dynamic response of the system. [8] b) OR Q6) Discuss the following : a) Load frequency control with generation rate constraints. b) Effect of speed governor dead band on automatic generation control. c) Digital load frequency controller. [6] and [5] [5] SECTION - II Q7) a) b) Explain the need of real time control of power system. Discuss basic components used for real time computer control of power system.[10] Draw functional block diagram and discuss real time monitoring of power system. [8] OR Q8) a) b) Draw a neat schematic / block diagram for supervisory control and data acquition system (SCADA) and explain principle of operation of SCADA system. [10] Write short notes on : [8] i) Telemetering. ii) Remote terminal unit. iii) Display monitoring and data logging. iv) Centralized and decentralized control. [3664]-178 2 Q9) a) b) Draw the loading capability curve of a synchronous generator. With the help of this curve, explain reactive power generation and absorption from a synchronous generator. [8] What is series compensation of a transmission line? Explain subsynchronous resonance associated with series compensation. [8] OR Q10)a) b) Q11)a) b) What is static VAR compensator? Explain with neat diagrams, various types of static VAR compensators. [8] Explain various types of FACTS controllers used for reactive power control. [8] Why interchange of power between interconnected utilities is beneficial? Explain economy interchange evaluation between interconnected utilities. [8] Explain interchange evaluation with unit commitment. [8] OR Q12)Explain the following : a) Power pools. b) Inadvertent power exchange. c) Emergency power interchange. d) Energy banking. vvvv [3664]-178 3 [16]

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