Harmonics are one of the major power quality concerns. They are non-sinusoidal waveforms which are nth times of fundamental frequency. Harmonics are mainly caused by non-linear loads because they draw distorted current waveform when supply voltage is sinusoidal waveform. Harmonic filters can be mainly classified into two: passive filtering techniques and active filtering techniques. The purpose of this project is to help users of electric power to understand harmonic distortion and its sources, to recognize if it is present and to take steps to reduce it or minimize its effects. Then the analysis of harmonic problem in power supply system is become easily possible by developing the MATLAB Simulation Model.

1. Project on
Simulation of Harmonics Filters To Reduce Harmonics
Distortion Using MATLAB
Members: Guided By:
1) Asha D. Rahane Prof.Piyush Dorale
2) Radhika S. Dhawale
3) Sayali N. Sawarkar
4) Shubhangi A. Bhatkar
Mauli Group Of Institution’s College Of
Engineering And Technology, Shegaon

2. CONTENTS
• INTRODUCTION
• HARMONIC SOURCES AND ITS EFFECTS
• HARMONIC FILTERING TECHNIQUES
• BLOCK DIAGRAM
• OUTPUT
• ADVANTAGES AND DISADVANTAGES
• APPLICATON
• CONCLUSION

3. INTRODUCTION
The purpose of this project is to help users of electric power to
understand harmonic distortion and its sources, to recognize if it is present
and to take steps to reduce it or minimize its effects. In this project,
harmonics in industrial power system and various harmonic mitigation
techniques for industrial power supply systems are firstly described. Then,
the harmonic problem in industrial power supply system detailed analysis
of harmonic filter simulated by Matlab/Simulink.

4. HARMONIC SOURCES AND ITS EFFECTS
Harmonics are sinusoidal voltages or currents having frequencies that
are integer multiples of the frequency at which the supply system is
designed to operate.
CAUSES
 Non linear loads
 Industrial loads
EFFECTS
 Overheating of conductors and transformer
 Decrease in efficiency
 Increase in losses

5. HARMONIC FILTERING TECHNIQUES
Harmonic filters can be mainly classified into two:
Passive filtering techniques
Active filtering techniques
1) Active Filtering Techniques
The more sophisticated active filtering concepts operate in a wide
frequency range, adjusting their operation to the resultant harmonic
spectrum.

6. 2)Passive Filtering Technique
One of the most common methods for control of harmonic distortion in
industry is the use of passive filtering techniques that make use of single-
tuned or band-pass filters.
Fig.1:(a) Single- tuned (b) 1st order high-pass (c) 2nd order high-
pass (d)3rd order high-pass (e) C-type.

7. ADVANTAGES AND DISADVANTAGES OF
PASSIVE FILTER OVER ACTIVE FILTER
Advantages of Passive Filter over Active Filter:
• Less costly than active filter.
• Passive filters can be used for small loads as well as large
loads in a power system.
Disadvantages of Passive Filter over Active Filter:
• Circuit becomes bulky as inductors are used.

14. ADVANTAGES
• Total harmonic distortion of current obtained is 25.51%
• Three winding transformer is use.
• Economical and essential way for harmonic reduction is use.
• Reduces 5th ,7th 11th and higher order harmonics .

15. DISADVANTAGES
• All filters are kept active all the time.
• This protection scheme is use only for low and medium
industrial system.

16. CONCLUSION
In this project, three-phase passive filter not only reducing for 11th
harmonic but also considering for distortion of 5th and 7th harmonic of the
system where harmonics are produced due to a twelve-pulse converter load.
The distortion of power supply current was diminished to a satisfactory
level with THD = 25.51% and voltage with THD = 26.26%

17. REFERENCES
• 2015 International Conference on Energy Systems and Applications (ICESA
2015)Dr. D. Y. Patil Institute of Engineering and Technology, Pune, India 30 Oct -
01 Nov, 2015 Design and Development of Passive Filter and Comparative Study of
Simulation Results of Passive and Active Filter
• Snehal Gadekar, Namrata Kulkarni, Miss.Sheetal Mhetre, Prof.H.H.Kulkarni
P.E.S.’s Modern College of Engineering, Pune 411-05 Design and Development of
Passive Filter and Comparative Study of Simulation Results of Passive and Active
Filter
• Shihong Wu，Junnan Wang, Rui Huang，Dan Guo School of Information and
Electrical Engineering Shenyang Agricultural University, Shenyang,
Liaoning,110866, China Harmonic Current Detection and Simulation with Active
Power Filter Based on Simulink

18. Conti…
• International Journal of Innovative Research in Computer and Communication
Engineering An ISO 3297: 2007 Certified Organization Vol.3, Special Issue 5, May
2015International Conference On Advances in Computer & Communication
Engineering (ACCE - 2015)on 5th & 6th May 2015, Organized by Department of
CSE, Vemana Institute of Technology, Bengaluru, India Copyright to IJIRCCE
www.ijircce.com 254 Study on Mitigation of Harmonics by Using Passive Filter
and Active Filter
• American National Standard (ANSI) IEEE SM 519-1992 (Revision of IEEE SM
519-1981)n IEEE Recommended Practices and Requirements for Harmonic Control
in Electrical Power Systems

19. Thank You…