According to growth of electricity demand and the increased number of non-linear loads in power grids, providing a high quality electrical power should be considered. In this paper, Enhancement of power quality by using fuzzy based multilevel power flow controller (DPFC) is proposed. The DPFC is a new FACTS device, which its structure is similar to unified power flow controller (UPFC). In spite of UPFC, in DPFC the common dc-link between the shunt and series converters is eliminated and three-phase series converter is divided to several single-phase series distributed converters through the line. This eventually enables the DPFC to fully control all power system parameters. It, also, increases the reliability of the device and reduces its cost simultaneously. In recent years multi level inverters are used high power and high voltage applications .Multilevel inverter output voltage produce a staircase output waveform, this waveform look like a sinusoidal waveform leads to reduction in Harmonics. Fuzzy Logic is used for optimal designing of controller parameters. Application of Fuzzy Multilevel DPFC for reduction of Total Harmonic Distortion was presented. The simulation results show the improvement of power quality using DPFC with Fuzzy logic controller.

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Designing of Multilevel DPFC to Improve Power Quality
ABSTRACT:
According to growth of electricity demand and the increased number of non-linear loads in
power grids, providing a high quality electrical power should be considered. In this paper,
Enhancement of power quality by using fuzzy based multilevel power flow controller (DPFC) is
proposed. The DPFC is a new FACTS device, which its structure is similar to unified power flow
controller (UPFC). In spite of UPFC, in DPFC the common dc-link between the shunt and series
converters is eliminated and three-phase series converter is divided to several single-phase series
distributed converters through the line. This eventually enables the DPFC to fully control all
power system parameters. It, also, increases the reliability of the device and reduces its cost
simultaneously. In recent years multi level inverters are used high power and high voltage
applications .Multilevel inverter output voltage produce a staircase output waveform, this
waveform look like a sinusoidal waveform leads to reduction in Harmonics. Fuzzy Logic is used
for optimal designing of controller parameters. Application of Fuzzy Multilevel DPFC for
reduction of Total Harmonic Distortion was presented. The simulation results show the
improvement of power quality using DPFC with Fuzzy logic controller.
KEYWORDS:
1. FACTS
2. Power Quality
3. Multi Level Inverters
4. Fuzzy Logic
5. Distributed Power Flow Controller component

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SOFTWARE: MATLAB/SIMULINK
BLOCK DIAGRAM:
Fig.1: The DPFC Structure.
EXPECTED SIMULATION RESULTS:
Fig.2: 5 Level Voltage Waveform

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Fig.3: Three Phase output Voltage and Current Waveform
Fig.4: Supply Voltage and Current Waveform with unity PF

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Fig.5: THD without fuzzy
Fig.6: THD with fuzzy

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CONCLUSION:
In this paper Fuzzy Logic Controller technique based distributed power flow controller (DPFC)
with multilevel voltage source converter (VSC) is proposed. The presented DPFC control system
can regulate active and reactive power flow of the transmission line. We are reducing the THD
value from 24.84% to 0.41% by using this technic as shown in fig’s (12) & (13).The series
converter of the DPFC employs the DFACTS concept, which uses multiple converters instead of
one large-size converter. The reliability of the DPFC is greatly increased because of the
redundancy of the series converters. The total cost of the DPFC is also much lower than the
UPFC, because no high-voltage isolation is required at the series converter part and the rating of
the components are low. Also results show the valid improvement in Power Quality using Fuzzy
Logic based Multilevel DPFC.
REFERENCES:
[1] K Chandrasekaran, P A Vengkatachalam, Mohd Noh Karsiti and K S Rama Rao, “Mitigation
of Power Quality Disturbances”, Journal of Theoretical and Applied Information Technology,
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[2] Priyanka Chhabra, “Study of Different Methods for Enhancing Power Quality Problems”,
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[3] Bindeshwar Singh, Indresh Yadav and Dilip Kumar, “Mitigation of Power Quality Problems
Using FACTS Controllers in an Integrated Power System Environment: A Comprehensive
Survey”, International Journal of Computer Science and Artificial Intelligence, Vol.1, No.1,
pp.1-12, 2011

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[4] Ganesh Prasad Reddy and K Ramesh Reddy, “Power Quality Improvement Using Neural
Network Controller Based Cascaded HBridge Multilevel Inverter Type D-STATCOM”,
International Conference on Computer Communication and Informatics, 2012
[5] Lin Xu and Yang Han, “Effective Controller Design for the Cascaded Hbridge Multilevel
DSTATCOM for Reactive Compensation in Distribution Utilities”, Elektrotehniski Vestnik,
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