Nowadays in the restructured scenario, the main challenging objective of the modern power system is to avoid blackouts and provide uninterrupted quality power supply with dynamic response during emergency to improve power system security and stability. In this sense the convertible static compensator (CSC) that is the Generalized Inter line power flow controller (GIPFC), can control and optimize power flow in multi-line transmission system instead of controlling single line like its forerunner FACTS (Flexible AC Transmission System) controller. By adding a STATCOM (Static synchronous Shunt Converter) at the front end of the test power system and connecting to the common DC link of the IPFC, it is possible to bring the power factor to higher level and harmonics to the lower level and this arrangement is popularly known as Generalized Inter line power flow controller (GIPFC). In this paper a new concept of GIPFC based on incorporating a voltage source converter with zero sequence injection SPWM technique is presented for reinforcement of system stability margin. A detailed circuit model of modified GIPFC is developed and its performance is validated for a standard test system. Simulation is done using MATLAB Simulink.Index Terms—Convertible static controller, Flexible AC Transmission System (FACTS), Generalized Interline Power Flow Controller (GIPFC),STATCOM, SSSC, Reactive power compensation.
FACTS (Flexible AC Transmission Systems) technology is one aspect of the Power electronics revolution that is taking place in all areas of electric energy. The power transfer capability of a transmission line can be enhanced by the use of Power Electronics based system like FACTS that offer high speed and reliable control capability. The Static Synchronous Series Compensator (SSSC) is the second generation of the FACTS controller, which is used to control the power flow in the transmission line. This paper presents the details of extensive computer simulation of SSSC with a control method based on Fuzzy Logic technique. For closed loop operation, d-q control algorithm is used for better performance result. In this paper a comparative evaluation of PI controller based and Fuzzy Logic controller based Static Synchronous Series Compensator has beendone for a test power system. Sensitivity of these controllers to the load variations is studied in MATLAB/SIMULINK and the simulation results are given.
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