High Power Multilevel Converters - Analysis, design and operational issues

By Prof. Anandarup Das   |   IIT Delhi
Learners enrolled: 1592
The course covers different types of high power converters used in the industry for applications in HVDC, FACTS, Motor Drives, Power quality improvement. Traditional converters like NPC and emerging converters like modular multilevel converters will be covered. Operational issues and design considerations for these medium/high voltage high power converters will be covered. The course will discuss many practical issues faced in the industry while designing and operation of these converters.

INTENDED AUDIENCE  : Interested Learners
PRE REQUISITES : Power Electronics
INDUSTRY SUPPORT : Siemens, ABB, Alstom, NTPC and other industries working in power sector
Course Status : Completed
Course Type : Elective
Duration : 12 weeks
Category :
  • Electrical, Electronics and Communications Engineering
  • Power Systems and Power Electronics
Credit Points : 3
Level : Undergraduate
Start Date : 24 Jan 2022
End Date : 15 Apr 2022
Enrollment Ends : 07 Feb 2022
Exam Date : 23 Apr 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 : (a) Half bridge, Full bridge and three phase converters, sinusoidal PWM
Week 2 : (a) 3rd harmonic addition,  space vector PWM

Week 3 : (a) Power devices
(b) Cascaded H-Bridge converter – Basic operation

Week 4 : (a)PWM Techniques for CHB converter
(b) Fault tolerant operation of CHB converter

Week 5 : (a) Modular Multilevel converter- Topology, operation and PWM

Week 6 : (a) Capacitor voltage balancing in MMC
(b) Different circuit topologies of MMC 
Week 7 : (a) Fault tolerant operation of MMC
(b) Design of components in MMC 
(c) A case study of CHB and MMC 
(d) NPC converter – Basic operation 
Week 8 : NPC - PWM technique

Week 9 : (a) NPC- midpoint voltage balancing
(b) Multi-pulse transformer 

Week 10 : (a) Clarke and Park transformation
(b) Steady state modelling of grid connected voltage source converter 

Week 11 : (a) Dynamic modelling of grid connected voltage source converter
(b) Gate driver circuit designing: turn on and turn off process  

Week 12 : (a) Features of gate driver circuit and condition monitoring of high power converters
(b) Other topologies: conclusion  

Books and references

1. Mainly lecture slides and research papers. 

2. Reference books:
(a) Bin Wu, High Power Converters and AC Drives, John Wiley, 2006.

Instructor bio

Prof. Anandarup Das

IIT Delhi
Anandarup Das works as an Assistant Professor in the Department of Electrical Engineering, IIT Delhi. He works in high power electronics and motor drives for various applications in electrical industries.

He worked for almost 3 years (2012 to 2014) in Siemens Power Electronics Centre (R&D) under Oil and Gas Division, Siemens, Norway as Senior Development Engineer. During this time he was involved in design, development and fabrication of subsea Variable Speed Drive (VSD) fed from a multilevel converter in the power range of 1-15 MW at around 6.6 kV voltage level.

From 2010 to 2012, he was employed as a Post Doctoral Researcher at the Norwegian University of Science and Technology (NTNU), Trondheim, Norway. During this time, the
research was to find suitable medium voltage, high power converters having high reliability and fail-safe operation.

Dr. Anandarup Das did his PhD from Indian Institute of Science, Bangalore, India in 2010. His PhD thesis was focussed on various advanced pulse width modulation (PWM) techniques for open end induction motor drives and generation of 12 sided space vector diagrams. He completed his masters from IIT Delhi in 2006 and Bachelor of Engineering from Indian Institute of Engineering Science and Technology (IIEST)(formerly BESU/Bengal Engineering College) in 2002.

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: 23 April 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 8 assignments out of the total 12 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 Madras .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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