Hello Soudipan

There are lot many books available.

1) Understanding FACTS - Narain G. Hingorani

2)FACTS: Modelling and Simulation in Power Networks by Enrique Acha, Claudio R. Fuerte-Esquivel.

3) INTRODUCTION TO FACTS CONTROLLERS-Kalyan K. Sen, Mey Ling Sen

If you need more specific information than inform.

Regards

"THYRISTOR-BASED FACTS CONTROLLERS FOR ELECTRICAL TRANSMISSION SYSTEMS", by R. Mathur and R.K. Varma

The Electrical Power Research Institute (EPRI) are the major innovator of the FACTS devices. Their library contains many reports that can be downloaded for free. The following book contains a chapter that presents the basics of FACTS devices as well as some applications.

https://www.researchgate.net/publication/307926879_Dynamic_Security_of_Interconnected_Electric_Power_Systems_-_Volume_2_Dynamics_and_stability_of_conventional_and_renewable_energy_systems

Thank you everyone for your helpful suggestions.

Start by "Understanding Facts by N. Hingorani," it gives a basic understanding of all FACTS devices .

Go for new book of Professor Bhim Singh of IIT Delhi on power quality.

Soudipan, I would like to recommend two books to you, the first is the already mentioned:

FACTS: Modelling and Simulation in Power Networks

Author(s):Enrique Acha, Claudio R. Fuerte-Esquivel, Hugo Ambriz-Pérez, César Angeles-Camacho

and the other, that has not been previously added in the discussion, is the:

HVDC and Facts Controllers

Author(s):Vijay K. Sood

Warmest regards.

FACTS Controllers in Power. System....... by Dr K.R.Padiyar is an easy to understand book. To get practical insight into actual installations refer to CIGRE papers .

The below link book is nice to have for study from basics

Article Custom Power Devices: An Introduction

Understanding FACTSNarain G. Hingorani is the best as rec by Birender Singh render Singh