This presentation discusses power quality improvement in small isolated distribution systems using a DSTATCOM (Distribution Static Compensator) with fuzzy logic control. It aims to regulate voltage, reduce harmonics, correct power factor, and balance loads. The system contains a DSTATCOM connected in parallel to regulate voltage and correct power factor as loads change. Simulation results show the DSTATCOM improves power quality by correcting power factor, balancing loads, and regulating voltage under different load conditions using both PI and fuzzy logic controllers. The presentation concludes fuzzy logic control of a DSTATCOM is effective for power quality improvement in small isolated power systems like ships, islands, and remote generation sites.

1. A Presentation on
Power Quality Improvement with
DSTATCOM using Fuzzy Controller Based
Small Isolated Distribution System
By
Aishvarya Narain

2. CONTENTS
• Power Quality
• Solution to Power Quality Problem
• Objectives
• Isolated System
• DSTATCOM
• System Description
• Schematic Diagram of System
• Conclusions
• Future Scope of Work
• List of Publications
• References

3. POWER QUALITY
• Power Quality is described as the variation of
voltage, current and frequency in power system.
• If electrical equipment operates correctly and
reliably without being damaged or stressed, we would
say that the electrical power is of good quality.
• On the other hand, if the electrical equipment
malfunctions, is unreliable, or is damaged during
normal usage, we would say that the power quality is
poor.

4. SOLUTION TO POWER QUALITY
PROBLEM
• Passive Filters have been most commonly used to
limit the flow of harmonic currents in distribution
systems.
• The performances of Conventional method (LC
Filter) is not satisfactory due to the drawbacks.
• Among the different new technical options available
to improve power quality, D-STATCOM have proved
to be an important and flexible alternative to
compensate for current and voltage disturbances in
power distribution systems.

5. OBJECTIVES
• To analyze the effect of linear and non-linear loads on
power system.
• Power Quality improvement for small isolated system
• Voltage Regulation
• Harmonics Reduction
• Power Factor Correction
• Load Balancing

6. ISOLATED SYSTEM
• Ships
• Off shore Plants
• Diesel Engine Trains
• Aircrafts
• Islands

7. DSTATCOM
• STATCOM is a controlled reactive power source
which provides the desired reactive power generation
and absorption by means of VSC.
• The VSC consist of shunt Transformer, DC
Capacitor, IGBT with back to back diode making a
bridge.
• STATCOM is an adjustable voltage source behind a
reactance.

8. FUNCTIONAL MODEL OF STATCOM

9. SYSTEM DESCRIPTION
• The model contains STATCOM for load balancing,
power factor correction and voltage regulation to
small isolated alternator feeding distribution system
supplying power to a linear unbalance load.
• VSC as a DSTATCOM connected in parallel with the
system.
• DSTATCOM considered here as a controlled reactive
source.

10. • Three phase AC supply voltages and DC link
voltages are sensed and converted into their per unit
values to fed the two PI Controller and fuzzy logic
controller.
• A capacitor is connected in parallel with VSI to
obtain self supporting DC bus to maintain constant
voltage in the system.
• VSI consist IGBT switches fired by gate pulse
generated through the Hysteresis controller.
• System also consist of linear R-L load.

11. SCHEMETIC DIAGRAM OF SYSTEM

12. SIMULINK MODEL FOR INCREASE
LOAD

13. SIMULINK MODEL FOR THREE PHASE TO
TWO LOAD

14. Power Factor Correction Using PI
Controller

15. Power Factor Correction Using Fuzzy
Controller

16. Voltage Regulation Using PI Controller

17. Voltage Regulation Using Fuzzy Logic
Controller

18. DSTATCOM for Load Balancing and Power
Factor Correction Using PI Controller

19. DSTATCOM for Load Balancing and Power
Factor Correction Using Fuzzy Controller

20. DSTATCOM for Load Balancing and Voltage
Regulation Using PI Controller

21. DSTATCOM for Load Balancing and Voltage
Regulation Using Fuzzy Controller

22. CONCLUSIONS
• Fuzzy Logic Control used for regulation of voltage
and correction of power factor with the help of
DSTATCOM is proposed here. As the load changes
or load is reduced there are variations in the load
current, voltage and DC capacitance voltage.
• DSTATCOM is able for correction to power factor,
load balancing and regulation in the voltage profile.
• It is useful for aircraft, ship, islands, submarine and
isolated remote power generation where grid
connected power generation is not really available
and we need to generate and distribute AC power.

23. FUTURE SCOPE
• Improve Power Quality of a small isolated alternator
system by some advance techniques.
• Implementation of Sugeno Fuzzy Controller (SFC)
for modeling and controlling of DSTATCOM
• In order to obtain voltage regulation by using two
Fuzzy logic controller.
• Power factor correction can be improved using the
above.

24. PUBLICATIONS
• Aishvarya Narain and S.K.Srivastava, “Power
Quality Improvement by Shunt Active Power Filter
Using 12 pulse Inverter”, IEEE-International
Conference on Emerging Trends in Electrical,
Electronics & Sustainable Energy Systems,(IEEE-
ICETEESES-16), vol.2, pp 198-203, Mar. 2016.
• Aishvarya Narain and S.K.Srivastava, “An
Overview of Facts Devices used for Reactive Power
Compensation Techniques”, International Journal
of Engineering Research & Technology
(IJERT),vol. 4(12) ,pp 81-85, Dec 2015.

25. REFERENCE
[1] Bhim Singh, Alka Adya, A.P. Mittal, J.R.P. Gupta,“Power
Quality Enhancement with DSTATCOM for Small Isolated
Alternator feeding Distribution System”,IEEE conference on
PEDS,2005.
[2] N.G.Hingorani and L.Gyugyi, Understanding FACTS,
Standard Publishers, Delhi. 2001.
[3] E. Acha, V.G. Agelegis, O. Anaya-Lara and T.J.E. Miller,
Power Electronic Control in Electrical Systems, Newness
Power Engineering Series, Oxford, Britain, 2002.
[4] A.Ghosh and G.Ledwitch, Power Quality Enhancement using
Custom Power Devices, Kluwer Academic Publishers,
London, 2002.
[5] N. Hingorani, “FACTS - Flexible ac transmission systems”,
in Proc. IEE 5th Int. Conf. AC / DC Transmission, London,
U.K. Conference Conf. Pub. 345, pp. 1–7, 1991
[6] “Introducing custom power”, IEEE Spectrum, vol. 32, pp. 41–
48, June 1995.

26. .
[7] IEEE Standard Board, “IEEE Std. 1159-1995”, IEEE Recommended
Practice for Monitoring Electric Power Quality”, IEEE Inc. New York,
1995.
[8] A. M. Gole, O. B. Nayak, T.S. Sidhu, and M. S. Sachdev, “A graphical
electromagnetic simulation laboratory for power systems engineering
programs”. Transactions on Power Systems, vol. 11, May 1996, pp. 599-
606.
[9] Roger C. Dugan, Mark F. Mc Granaghan and H. Wayne Beaty, ,
“Electrical power systems quality”, Mc Graw-Hill publication,1996,
TK1001.D84 ,pp. 1-8 and 39-80.
[10] D. D. Sabin, “An assessment of distribution system power quality”,
Electrical Power Research Institute, EPRI Final Report TR-106294-V2,
Palo Alto, CA, 1996.
[11] A. Hernandez, K. E. Chong, G. Gallegos, and E. Acha, “The
implementation of a solid state voltage source in PSCAD/EMTDC”, IEEE
Power Engineering Review, Dec 1998, pp. 61-62.
[12] G. F. Reed, M. Takeda, I. Iyoda, “Improved power quality solutions
using advanced solid-state switching and static compensation
technologies”, IEEE Power Engineering Society Winter Meeting
USA.IEEE, 31st Jan.- 4th Feb, New York, 1999 pp. 2-11.
[13] S. Nilsson, “Special application considerations for custom power
systems”, Proc. IEEE Power Engineering Society, Winter Meeting, vol.
2,1999, pp. 1127–1130.

27. .
[14]E. Acha, V.G. Agelegis, O. Anaya-Lara and T.J.E.Miller, Power
Electronic Control in Electrical Systems,Newness Power Engineering
Series, Oxford, Britain,2002.
[15]A.Ghosh and G.Ledwitch, Power Quality
Enhancement using Custom Power Devices, Kluwer Academic Publishers,
London, 2002.
[16] W. E.Reid, “Power Quality issues – Standards andguidelines”, IEEE
Transaction on Power Delivery, Vol.32, No.3, May/ June 1996.
[17] M. F. Naguib and L. A. C. Lopes, “Harmonics reduction in current source
converters using fuzzy logic,” IEEE Trans. Power Electron., vol. 25, no. 1,
pp. 158–167, Jan. 2010.
[18] R. Arnold, “Solutions to the power quality problem”, Power Engineering
Journal, Vol. 15, No. 2, April2001,pp. 65-73.
[19] [Online].Available:http://www.yamahageneratorstore.c
om/ef2800i.htm
[20] B. N. Singh, A. Chandra and K. Al-Haddad, “DSP based indirect-current
controlled STATCOM-I Evaluation of current controlled techniques,” IEE
Proc. on Electric Power Applications, Vol.147.2, March 2000, pp.107-112.
[21] Harish Suryanarayana and Mahesh k. Mishra, “Fuzzy logic based
supervision of DC link PI control in a DSTATCOM “, IEEE India
conference 2008,volume-2,pages 453-458

28. THANK YOU