Course Objectives:









1.      To learn the concept of power flow control through various power electronic controllers including state of art FACTS controllers,

2.      To explain their operational aspects and their capabilities and their integration in power flow analysis.

3.      To explain the working principle of various types of FACTS controllers

4.      To learn the effectiveness of FACTS controllers in distribution system for harmonic mitigation etc.


Overview: Concept of reactive power compensation, Review of series and shunt compensation,  Concepts of transient stability and voltage stability, Power system oscillations.


Shunt Compensators: Mid point voltage regulation, Method of controlled VAr generation, principle of operation, Control and characteristics of SVC and STATCOM, Multi-control functional model of STATCOM for power flow analysis, Implementation of STATCOM models in Newton power flow, STATCOM in optimal power flow (OPF), STATCOM in distribution system (DSTATCOM), DSTATCOM performance in various modes including harmonic mitigation.


Series Compensators : Series compensation and voltage stability, Variable impedance type series compensators (TCSC) and switching converter type series converter (SSSC),  Configurations, Control and characteristics, General applications, Modelling of multi-control functional model of SSSC in power flow analysis, Implemetation of SSC models in Newton power flow, SSSC in OPF, Dynamic Voltage Restorer (DVR) in Distribution System, Subsynchronous Resonance Problem, NGH Scheme.


Unified Power Flow Controllers : Objectives and principle of operation of voltage and phase angle regulations, Static phase shifter and its operating characteristics, Unified Power Flow Controller (UPFC) control and characteristics, UPFC as generalised SSSC, Modelling of UPFC for power flow and OPF studies, Implementing UPFC in Newton power flow, Power oscillations control with UPFC.


Interline power flow controller: Principle of operation, Control and characteristics, Model of IPFC for power flow and optimum power flow studies.


Course Learning Outcomes (CLO):

On the completion of the course, the student will be able:

1.      To understand the power system control through various power electronic controllers including state of art FACTS controllers.

2.      To analyse the operational aspects and their effectiveness in transient stability enhancement,

3.      To assess the issues of damping to power system oscillations, real and reactive power control capability in power system

4.      To learn the integration in power flow analysis and their effectiveness in distribution system for harmonic mitigation etc.

Recommended Books:

1.        Song, Y.H. and Johns, A.T., Flexible AC Transmission Systems, IEEE Press (1999).

2.        Hingorani, N.G. and Gyragyi, L., Understanding FACTS (Concepts and Technology of Flexible AC Transmission System), Standard Publishers & Distributors (2001).

3.        Mathur, R.M. and Verma, R.K., Thyristor based FACTS controllers for Electrical Transmission Systems, IEEE Press (2002).

4.        Zhang, X. P., Rehtanz, C. and Pal, B., Flexible AC Transmission Systems: Modelling and Control, Springer (2006).