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Previous Year Exam Questions for Flexible AC Transmission System - FACT of 2018 - bput by Bput Toppers

  • Flexible AC Transmission System - FACT
  • 2018
  • PYQ
  • Biju Patnaik University of Technology BPUT - BPUT
  • Electrical Engineering
  • B.Tech
  • 32 Offline Downloads
  • Uploaded 1 year ago
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Registration No : Total Number of Pages : 02 6th Semester Regular Examination 2017-18 FLEXIBLE AC TRANSMISSION SYSTEMS BRANCH : ELECTRICAL Time : 3 Hours Max Marks : 100 Q.CODE : C495 Answer Part-A which is compulsory and any four from Part-B. The figures in the right hand margin indicate marks. Answer all parts of a question at a place. Q1 a) b) c) d) e) f) g) h) i) j) Q2 a) b) c) d) e) B.Tech. PEE6D002 Part – A (Answer all the questions) Answer the following questions: multiple type or dash fill up type Thermal capability of an overhead line is a function of the (i) Wind condition (ii) Line reactance (iii) Line capacitance (iv) None Generally the rating of series FACTS Controllers would be _____of throughput rating of the line. (i) 10% (ii) 50% (iii) 100% (iv) 5% Shunt Controllers will compensate reactive power only, when the current injection angle is ________ with line voltage. In case of current-sourced converter, the power reversal involves in reversal of _________. In BESS FACTCS device the role of converter is to charge the battery, when (i) supplying active power to the system (ii) supplying reactive power to the system (iii) absorbing reactive power from the system (iv) None. Metal oxide varistor is used in (i) TCVR (ii) TCPST (iii) TCVL (iv) TCBR. The term ‘Break-even distance’ is related to (i) HVDC (ii) VSC (iii) TCR (iv) IPFC Stability limit of the transmission line decreases with increase in (i) Line length (ii) Load (iii) Line resistance (iv) None. The midpoint of the transmission line is the best location for the compensator because (i) Large voltage swell at midpoint (ii) Low reactance at midpoint (iii) Large voltage sag at midpoint (iv) High Reactance at midpoint Which device can compensate active power (i) STATCOM (ii) TCR (iii) FC-TCR (iv) GCSC (v) TSSC Answer the following questions : Give two benefits of interconnections in transmission systems? What are the different types of losses in STATCOM? How is reactive power controlled in electrical network? Mention different modes of operation of TCSC. How the voltage stability can be enhanced, explain? (2 x 10) (2 x 10)

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f) g) h) i) j) Q3 a) b) Q4 a) Give a comparison between STATCOM and SVC. What is synchronous condenser? What for it is used? Explain the role of SVS in power system. What is UPQC? In which way it is different from UPFC. Give a cost comparison between HVDC and FACTS ? Part – B (Answer any four questions) Justify that the midpoint of the transmission line is the best location for the shunt compensator with suitable diagrams. Draw a block diagram of the variable reactance model of the TCSC and explain the diagram. (10) (5) (10) b) With the help of equal area criterion explain how to improve transient stability with the help of midpoint compensator. Explain the operation of TCR and TSR with neat schematics. Q5 a) b) Explain the working principle & V – I char. Of STATCOM. Explain the advantages of combined shunt-series over individual compensator. (10) (5) Q6 a) Explain with neat diagram, how voltage stability at load bus can be achieved using series compensation. Give the schematic diagram of UPFC and explain each component of it. (10) With suitable phasor diagram explain how real and reactive power flow control is done using phase angle regulator. Draw the V-I characteristics showing the operating region for FC-TCR, TSRTSC? (10) Explain the functional internal control scheme for TCSC based on synchronized to the fundamental component of the line current and prediction of capacitor voltage zero crossings. Explain in detail the phenomenon of sub synchronous resonance (SSR) with an example. (10) Explain basic control scheme for the voltage sourced converter type var generator controlling the reactive output by the variation of the DC capacitor voltage. Explain how VSC will act as an inverter or a rectifier in inductive or capacitive mode. (10) b) Q7 a) b) Q8 a) b) Q9 a) b) (5) (5) (5) (5) (5)

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