EX-702-A Power Electronics Applications to Power System - Nov 2022 Question Paper

Under each question, How to answer lists the points an answer should cover, outlined by CampusPrep from the syllabus. Check the details against your textbook.

1. 7 Marks
   aWhat is the Flexible AC Transmission Systems (FACTS) controller? Explain different types of FACTS controllers.
   How to answer

   • Define FACTS controller and its purpose in AC transmission
   • Classify FACTS controllers - series, shunt, combined series-series and combined series-shunt
   • Give examples of each type with function
2. 7 Marks
   bExplain the working of Static condenser (STATCON)?
   How to answer

   • Define STATCON / STATCOM concept
   • Describe power circuit with VSC and shunt connection
   • Explain reactive power exchange and voltage regulation working
3. 7 Marks
   aExplain the working of Thyristor Controlled Series Compensators (TCSC).
   How to answer

   • Define TCSC and its series connection in line
   • Describe thyristor controlled reactor in parallel with capacitor
   • Explain variable series compensation and power flow control
4. 7 Marks
   bWhat is the difference between series and shunt compensation? Explain the working of SVC.
   How to answer

   • Define series compensation vs shunt compensation
   • Compare connection, function and effect on voltage and power flow
   • Explain working of SVC with TCR-TSC configuration
5. 7 Marks
   aHow do FACTS controllers control the flow of power and improve system stability?
   How to answer

   • State power flow parameters P, Q, V controlled by FACTS
   • Explain series, shunt and phase angle control actions
   • Link to stability improvement and damping oscillations
6. 7 Marks
   bWhat is the power quality? Explain the various Power Quality problems in distribution systems.
   How to answer

   • Define power quality
   • List power quality problems - sag, swell, harmonics, flicker, interruption
   • Explain causes and effects in distribution systems
7. 7 Marks
   aWhat are the harmonics? Which type of harmonics is generated by loads? What is the effect of harmonics on the system?
   How to answer

   • Define harmonics and harmonic distortion
   • Identify non-linear loads generating harmonics
   • Explain effects - heating, resonance, maloperation, losses
8. 7 Marks
   bWhat is the use of filters? Explain different types of the filters used in the transmission and distribution line.
   How to answer

   • State use of filters for harmonic mitigation
   • Classify passive, active and hybrid filters
   • Explain application in transmission and distribution lines
9. 7 Marks
   aExplain the working of D - STATCOM.
   How to answer

   • Define D-STATCOM for distribution system
   • Describe VSC based shunt connection
   • Explain voltage regulation and reactive compensation working
10. 7 Marks
    bExplain the HVDC Converters and their characteristics.
    How to answer

    • Define HVDC converters - rectifier and inverter
    • Describe line commutated and voltage source types
    • Explain characteristics - control, harmonics, power reversal
11. 7 Marks
    aHow do power electronic conditioners help to reduce the power quality problems in the power system?
    How to answer

    • Define power electronic conditioners / custom power devices
    • Explain DVR, D-STATCOM, UPQC actions
    • Show how sags, harmonics and unbalance are mitigated
12. 7 Marks
    bExplain the working of dynamic static synchronous series controllers.
    How to answer

    • Define dynamic static synchronous series controller
    • Describe SSSC / DVR series injection principle
    • Explain voltage compensation and power flow control
13. 7 Marks
    aExplain the working of pump storage hydro electric power plant.
    How to answer

    • Define pumped storage plant with upper and lower reservoirs
    • Explain pumping mode and generating mode
    • State role in peak load and energy storage
14. 7 Marks
    bHow does an energy storage device help to store and reuse energy? Explain the application of energy storage devices.
    How to answer

    • Define energy storage need for power system
    • Explain charging, storing and discharging process
    • List applications - peak shaving, stability, renewable integration
15. 14 Marks
    Explain any two of the following

    1. a)Static Synchronous Series Compensator (SSSC)
    2. b)IEEE standards
    3. c)Parallel and series operation of converters
    4. d)AC/AC voltage regulators
    How to answer

    • Select any two topics from the list
    • Define principle and configuration of each
    • Explain working and power system application