Static Synchronous Series Compensator based on Z - Source Inverter

The role of power system is to supply the power to the various load center. Today´s power system is designed to operate effectively and efficiently. In earlier years, Electric power system was small and localized. In order to improve stability of the system, real and reactive power compensation in the transmission line is important. This paper describes theory & modeling of one of the Flexible Alternating Current Transmission System (FACTS) devices, called as Static Synchronous Series Compensator (SSSC). Generally SSSC is connected to the bus through Voltage Source Inverter (VSI), but it is having demerits like limited output voltage, restriction on simultaneous switching of upper & lower switches etc. All these issues are sort out if Z source inverter (ZSI) is used instead of VSI. This paper presents modeling of SSSC based on Z - Source Inverter (ZSI) with SPWM technique. The system´s behavior with and without SSSC have been studied.