Design, Modeling and Simulation of Fuzzy Controlled Svc for 750km (Λ/8) Transmission Line

  Design, Modeling and Simulation of Fuzzy Controlled Svc for 750km (Λ/8) Transmission Line project is mainly concentrated on the importance of SVC in achieving continuous and automatic reactive power control using fuzzy logic controller. From the previously obtained values of voltage, currents and alpha values, fuzzy rules were set in order to obtain the desired firing angles of SVC so as to obtain a flat voltage profile in transmission network. The standard test system is simulated in MATLAB along with fuzzy logic controller. The results obtained were found to be proving trustworthy and can be implemented for the real time control of reactive power in any power system. 

Flexible AC transmission system (FACTS) is a technology, which is based on power electronic devices, used to enhance the existing transmission capabilities in order to make the transmission system flexible and independent operation. The FACTS technology is a promising technology to achieve complete deregulation of Power System i.e. Generation, Transmission and Distribution as complete individual units. The loading capability of transmission system can also be enhanced nearer to the thermal limits without affecting the stability. Complete close-loop smooth control of reactive power can be achieved using shunt connected FACTS devices. 

Intelligent FACTS devices make them adaptable and hence it is emerging in the present state of art.

The design, modeling and simulations are carried out for λ /8 Transmission line and the compensation is placed at the receiving end (load end).

            In ac power system, the generation and load must be balance at all times. To some extent, electrical system is self regulating. Beyond that when propped up with reactive power support load will go up, frequency keeps dropping and system will collapse. Alternatively, if there is inadequate reactive power, system can have voltage collapse. Thus reactive power control is an important control objective of any power system as its unbalance causes voltage variation at the load end. If the voltage variation is more than the   pre specified valve the performance of equipment suffers and life of most of equipment is sacrificed. Hence maintaining   voltage within reasonable limits is an important objective of power system control.

The conventional methods available for reactive power control are shunt capacitor, series capacitor, tap changing transformers and synchronous modifier. But these are operated by mechanical switches; hence do not offer fast and continuous control. 

FACTS controllers can enable alien to carry power closer to its thermal rating. According to IEEE terms FACTS means-alternating current transmission system incorporation power electronics-based and other static controllers to enhance controllability and increase power transfer capability.

               The various types of FACT controllers include the shunt connected, series connected controllers and a combination of these two. Of these we have used the shunt connected controller.

TCR-FC is an SVC device which offers fast, effective and continuous control of voltage which compensates both for over voltage and under voltage.    

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