Applications of power electronic converters in power systems went into the development of Flexible AC Transmission Systems. The Thyristor Controlled Series Capacitor (TCSC) and Static Synchronous Series Compensator (SSSC) are two main series controllers in the FACTS family.
Papers:
S. Parvathy, K. C. Sindhu Thampatty, Science Direct, “Dynamic Modeling and Control of UPFC for Power Flow Control,” Procedia Technology 21, pp.581 – 588, 2015.
Geethu, K.C Sindhu Thampatty, “Design And Implementation Of Series Connected FACTS Devices For Enhancing Powersystem Oscillation Damping,” IJAIET, vol. 3, no. 6, pp. 13–20, 2016.