The document discusses a novel online fuzzy control method for a static VAR compensator (SVC) to enhance reactive power control in transmission lines, highlighting its application within flexible AC transmission systems (FACTS). Utilizing MATLAB/Simulink for design and simulation, the paper demonstrates how fuzzy logic can effectively manage firing angles for improved control over voltage variations. The results indicate that the SVC device can compensate for both over and under voltages, providing effective reactive power management regardless of load changes.

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A Novel Online Fuzzy Control Method of Static VAR Compensation
for an Effective Reactive Power Control of Transmission Lines
ABSTRACT:
The Flexible AC Transmission System (FACTS) technology is a promising technology to
achieve complete deregulation of Power System i.e. Generation, Transmission and
Distribution as the complete individual units. FACTS is based on power electronic devices,
used to enhance the existing transmission capabilities in order to make the transmission
system flexible and independent in operation. The loading capability of transmission system
can also be enhanced nearer to its thermal limit without affecting the stability. Complete
closed-loop smooth control of reactive power can be achieved using shunt connected FACTS
devices. Static VAR Compensator (SVC) is one of the shunt connected FACTS devices,
which can be utilized for the purpose of reactive power compensation. As the Intelligent
FACTS devices make them adaptable, it is emerging as the present state of the art technology.
This paper presents the design and simulation of the Fuzzy logic control to vary firing angle of
SVC in order to achieve better, smooth and adaptive control of reactive power in transmission
systems. The design, modeling and simulations are carried out for the λ/8 Transmission line by
placing the compensation at the receiving end (load end) and the results obtained demonstrates
the effectiveness of the proposed method.
KEYWORDS:
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1. Fuzzy Logic
2. FACTS and SVC
SOFTWARE: MATLAB/SIMULINK

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BLOCK DIAGRAM:
Fig. 1.Structure of fuzzy logic controller..
Fig.2. Single Phase equivalent circuit and fuzzy logic control structure of SVC.

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EXPECTED SIMULATION RESULTS:
Fig.3.Uncompensated voltages for heavy loads.
Fig. 4.Uncompensated voltage for light load.
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Fig.5.Inductor Current for firing angle of 165°.
Fig. 6. Compensated VR =VS (RMS voltage) for R=200Ω.
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Fig. 7. Compensated VR=VS (instantaneous voltage) For R=200 Ω.
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CONCLUSION:
This paper presents an “online Fuzzy control scheme for SVC” and it can be concluded that the
use of fuzzy controlled SVC (FC-TCR) compensating device with the firing angle control is
continuous, effective and it is a simplest way of controlling the reactive power of transmission
line. It is observed that SVC device was able to compensate both over and under voltages.
Compensated voltages are shown in Fig. 17 and Fig. 18. The use of fuzzy logic has facilitated the
closed loop control of system, by designing a set of rules, which decides the firing angle given to
SVC to attain the required voltage. With MATLAB simulations [4] [5] and actual testing it is
observed that SVC (FC-TCR) provides an effective reactive power control irrespective of the
load variations.
REFERENCES:
1. Narain. G. Hingorani, “Understanding FACTS, Concepts and Technology Of

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flexible AC Transmission Systems”, by IEEE Press USA.
2. Bart Kosko, “Neural Networks and Fuzzy Systems A Dynamical Systems
Approach to Machine Intelligence”, Prentice-Hall of India New Delhi, June
1994.
3. Timothy J Ross, “Fuzzy Logic with Engineering Applications”, McGraw-Hill,
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Inc, New York, 1997.
4. Laboratory Manual for Transmission line and fuzzy Trainer Kit Of Electrical
Engineering Department NIT Warangal.
5. SIM Power System User Guide Version 4 MATLAB Manual