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Course Detail

Course Name Flexible AC Transmission Systems
Course Code 15EEE342
Program B. Tech. in Electrical and Electronics Engineering
Credits Bengaluru / Coimbatore / Amritapuri
Year Taught 2015
Year Taught 2016
Year Taught 2017
Year Taught 2018


Unit 1

FACTS concept and General system considerations – Transmission Interconnections, Flow of power in an AC system, Loading capability, Power flow and dynamic stability considerations of a transmission interconnection, basic types of FACTS controllers, IEEE definitions, FACTS devices in India and abroad.

Shunt compensation and shunt FACTS devices – Concept of shunt compensation, objectives of shunt compensation, variable impedance type shunt compensators (TCR, TSC, FC-TCR, TSC-TCR) – circuit diagram, principle of operation, working, waveforms / characteristics.

Unit 2

Switched converter type shunt compensator (STATCOM) – circuit diagram, principle of operation, working, waveforms / characteristics, control schemes for shunt compensators.

Series compensation and Series FACTS devices – Concept of series compensation, objectives of series compensation, variable impedance type series compensators (GCSC, TSSC, TCSC), Switching converter type series compensators – circuit diagram, principle of operation, working, waveforms/characteristics, control schemes for series compensators.

Unit 3

Static voltage and phase angle regulators – Objectives of voltage and phase angle regulators, power flow control, improvement of transient stability, power oscillation damping, thyristor-controlled voltage and phase angle regulators.

Combined FACTS compensators and other special purpose FACTS devices – Unified Power flow Controller (UPFC) – objectives and need, principle of operation, Interline power flow controller (IPFC) – objectives and need, principle of operation. NGHSSR damper, thyristor-controlled braking resistor (TCBR).

Case studies of practical applications of various FACTS devices.

Text Books

  • Narain G. Hingorani and Laszlo Gyugyi, “Understanding FACTS – Concepts and technology of Flexible AC transmission system”, IEEE power Engineering Society, 1999.


  • T. J. E. Miller, “Reactive power control in Electric systems”, Wiley-Interscience Publication, John Wiley and sons, 1982.
  • R. Mohan Mathur and Rajiv K. Varma, “Thyristor-based FACTS controller for electrical transmission system, IEEE series on power Engineering”, Wiley Interscience, 2002.
  • Padiyar K. R, “FACTS controllers in power transmission and distribution”, New Age Publishers, India, 2007.

‘Flexible AC Transmission Systems’ is a course offered in B. Tech. in Electrical and Electronics Engineering program at School of Engineering, Amrita Vishwa Vidyapeetham.

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