Power Quality Improvement Technique

By Prof. Avik Bhattacharya   |   IIT Roorkee
Learners enrolled: 1240
The power quality of modern power distribution system is vulgarized due to the increased use of distributed sources,adjustable speed drive, nonlinear load and unbalanced load. The main challenge in the distribution system is the mitigation of power quality problems produced by load disturbances and supply disturbances [1], [2]. It can be mitigated by passive filters as well as active filters. The passive filters are economically cheap but their performance is poor compared to the active power filters [2]. Hence active power filters are preferred in the modern power system

: Final year B.Tech, M.Tech of Power Electronics and power system,Power electronics Engineer / Expert from industry
PREREQUISITES : Power Electronics
: ABB, GE, Statcon Energeia, CESC, NTPC, NHPC all state electric supply board, AAI
Course Status : Completed
Course Type : Elective
Duration : 8 weeks
Category :
  • Electrical, Electronics and Communications Engineering
Credit Points : 2
Level : Postgraduate
Start Date : 24 Jan 2022
End Date : 18 Mar 2022
Enrollment Ends : 07 Feb 2022
Exam Date : 27 Mar 2022 IST

Note: This exam date is subjected to change based on seat availability. You can check final exam date on your hall ticket.

Page Visits

Course layout

Week 1 : Concept of Power Quality: Frequency variations, voltage variations- sag and swell, waveform distortion –dc offset,harmonics, inter-harmonics, notching and noise.
Week 2 : Representation of harmonics, waveform, harmonic power,measures of harmonic distortion; Current and voltage limits of harmonic distortions: IEEE, IEC, EN, NORSO
Week 3 : Causes of Harmonics: 2-pulse, 6-pulse and 12-pulse converter configurations, input current waveforms and their harmonic spectrum; Input supply harmonics of AC regulator, integral cycle control, cycloconverter, transformer, rotating machines, ARC furnace, TV and battery charger.
Week 4 : Elimination/ Suppression of Harmonics: High power factor converter, multi-pulse converters using transformer connections
(delta, polygon)
Passive Filters: Types of passive filters, single tuned and high pass filters, filter design criteria, double tuned filters, damped filters
and their design
Week 5 : PWM Inverter: Voltage sourced active filter, current sourced active filter, constant frequency control, constant tolerance band control,variable tolerance band control.
Week 6 : Active Power Filters: Compensation principle, classification of active filters by objective, system configuration, power circuit andcontrol strategy
Week 7 : Hybrid Shunt Active power filter: Principle of operation, analysis and modelling
Week 8 : Unified power quality conditioner, voltage source and current source configurations, principle of operation for sag, swell and flicker control

Books and references

1. Derek A. P., “Power Electronic Converter Harmonics”, IEEE Press
2. Arrillaga J., Smith B. C., Watson N. R. and Wood A. R., “Power System Harmonic Analysis”, 2nd 2008 Ed., Wiley India.
3. Dugan R. C., McGranaghan M. F. and Beaty H. W., Electrical Power System Quality”, McGraw-Hill International Book Company

Instructor bio

Prof. Avik Bhattacharya

IIT Roorkee
Dr Avik Bhattacharya is working as Assistant Professor in IIT Roorkee from February 2014. Before joining IIT Roorkee he was research and development team of Danfoss Solar inverter and ABB. He has over a decade of experience in power quality issues and published four IEEE transaction on it. He is also teaching this course in IIT Roorkee for past two years for UG and PG (B.Tech fourth year and M.Tech) . His teaching is right blending of Industry, research and academic interest

Course certificate

The course is free to enroll and learn from. But if you want a certificate, you have to register and write the proctored exam conducted by us in person at any of the designated exam centres.
The exam is optional for a fee of Rs 1000/- (Rupees one thousand only).
Date and Time of Exams: 27 March 2022 Morning session 9am to 12 noon; Afternoon Session 2pm to 5pm.
Registration url: Announcements will be made when the registration form is open for registrations.
The online registration form has to be filled and the certification exam fee needs to be paid. More details will be made available when the exam registration form is published. If there are any changes, it will be mentioned then.
Please check the form for more details on the cities where the exams will be held, the conditions you agree to when you fill the form etc.


Average assignment score = 25% of average of best 6 assignments out of the total 8 assignments given in the course.
Exam score = 75% of the proctored certification exam score out of 100

Final score = Average assignment score + Exam score

YOU WILL BE ELIGIBLE FOR A CERTIFICATE ONLY IF AVERAGE ASSIGNMENT SCORE >=10/25 AND EXAM SCORE >= 30/75. If one of the 2 criteria is not met, you will not get the certificate even if the Final score >= 40/100.

Certificate will have your name, photograph and the score in the final exam with the breakup.It will have the logos of NPTEL and IIT Roorkee.It will be e-verifiable at nptel.ac.in/noc.

Only the e-certificate will be made available. Hard copies will not be dispatched.

Once again, thanks for your interest in our online courses and certification. Happy learning.

- NPTEL team

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