Selective Harmonic Mitigation Based on Closest Level Modulation Scheme for Cascaded H-Bridge Multilevel Inverter

Abstract

Multi-inverters have higher quality output waveform as they have lower total harmonic distortion (THD) but the individual harmonics do not satisfy the Grid Code EN 50160 and CIGRE Code WG 36-05. Therefore, mitigation of these individual harmonics is necessary to satisfy the mentioned codes. In this paper, a novel solution for mitigating individual harmonics has been proposed. The proposed harmonic mitigation technique uses nearest level control (NLC) for reducing individual harmonics in a grid-cascaded H-bridge multilevel inverter (CBH-MLI). The proposed technique involves solving simultaneous non-linear equations in real-time. For this, first non-linear equations have been derived and then proposed individual harmonics mitigation techniques are digitally applied for 7-level and 9-level CHB-MLI. The main advantage of the proposed novel technique is that it is easy to implement in real time due to less computational burden and lower complexity. Further, an experimental setup has been developed to validate the simulation results. From the results it is obtained that individual harmonics has been reduced for 7-level and 9-level CHB-MLI.

Keywords:

• cascaded H-bridge multilevel inverter (CBH-MLI)
• closest level modulation scheme
• nearest level control (NLC)
• selective harmonic mitigation (SHM)
• total harmonic distortion (THD)

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Notes on contributors

Mohammad Zaid

Mohammad Zaid received M.Tech. in Electrical Engineering (Power system and Drives) from Aligarh Muslim University in year 2015 and B.Tech. in Electrical Engineering from Aligarh Muslim University in year 2013. He is presently pursuing his Ph.D. in the area of Multilevel Inverter. He has published/presented more than 50 papers (https://scholar.google.com/citations?user=kYx-q9wAAAAJ&hl=en) in various peer reviewed International conferences and SCI Journals including IEEE, IET, Taylor and Francis, Wiley (UK). He has won best paper awards in several IEEE- International Conferences. Mr. Mohammad Zaid has already guided 08 M.Tech thesis, and 08 undergraduate projects He has taught courses on Renewable energy systems, Power system protection, Signals and Systems, Electrical Machines and Power Quality to undergraduate and postgraduate students. He is a member of IEEE and is currently the branch counsellor of IEEE- Student Branch of AMU. He has worked as Assistant Director of Residential Coaching academy (RCA) of AMU, Aligarh. Before Joining AMU he was Selected as Executive Engineer, Power Grid Corporation of India (PGCIL) a Navratna PSU. His research areas of interest are High gain DC-DC converters, Multilevel Inverter, Maximum power point tracking and Power Quality.

Adil Sarwar

Adil Sarwar (Senior Member, IEEE) received the B.Tech., M.Tech., and Ph.D. degrees from Aligarh Muslim University, Aligarh, India, in 2006, 2008, and 2012, respectively. He has been with the Department of Electrical Engineering, Aligarh Muslim University, since 2015. Earlier, he was associated with the Electrical Engineering Department, Galgotia College of Engineering and Technology, Greater Noida, India, from 2012 to 2015. He is also working on world-bank-sponsored research projects. He has published more than 75 research papers in international journals and conferences. He has contributed a chapter in Power Electronics Handbook (fourth edition, Edited by M. H. Rashid). He is a Life Member of the Systems Society of India.

Mohammad Tayyab

Mohammad Tayyab (Student Member, IEEE) received the bachelor’s degree in electrical engineering, the master’s degree in power system and drives, and the Ph.D. degree from Aligarh Muslim University, Aligarh, India, in 2011, 2013, and 2022, respectively. He is now associated with Texas University Doha, Qatar as a Post-doc researcher. His current research interests include switched-capacitor multilevel inverters and the grid-connected operation of multilevel inverters.

Atif Iqbal

Atif Iqbal (Senior Member, IEEE) received the B.Sc. and M.Sc. degrees in engineering (power system and drives) from Aligarh Muslim University (AMU), Aligarh, India, in 1991 and 1996, respectively, the Ph.D. degree from Liverpool John Moores University, Liverpool, U.K., in 2006, and the D.Sc. degree (Habilitation) in control, informatics, and electrical engineering from the Gdańsk University of Technology, in 2019. He is currently a Full Professor with the Department of Electrical Engineering, Qatar University, Doha, Qatar, and a former Full Professor with the Department of Electrical Engineering, AMU. He has been a Lecturer with the Department of Electrical Engineering, AMU, since 1991, where he was a Full Professor, until August 2016. He is also the Head of the Design Team of Power Electronics and Drives Equipment, PowerLab Instruments, Chennai, India. He has been listed in the top 2% highly cited scientists of the world (data released by Stanford University, USA). The world ranking was 649, in 2019, and 622, in 2020, and the current ranking is 457 (Year 2021) (whole career data). The ranking was 258 for one-year data (2021). He has published widely in international journals and conferences on his research findings related to power electronics, variable speed drives, and renewable energy sources. He has authored or coauthored more than 540 research articles and four books and several chapters in edited books. He has supervised several large research and development projects worth more than a million USD. He was a recipient of the Maulana Tufail Ahmad Gold Medal for standing first at the B.Sc.Engg. (electrical) exams from AMU, in 1991. He was also a recipient of the Outstanding Faculty Merit Award (2014–2015) and the Research Excellence Awards from Qatar University, in 2015 and 2019. He has received several best research papers awards, e.g., IEEE ICIT-2013, IET-SEISCON-2013, SIGMA 2018, IEEE CENCON 2019, IEEE ICIOT 2020, ICSTEESD-20, Springer ICRP 2020, and IEEE GUCON 2021. He is a fellow of IET and IE. He has also received the Gold Medal for the B.Sc. degree. He is the Vice-Chair of the IEEE Qatar section. He is also an Associate Editor of IEEE Transactions on Industrial Electronics and IEEE Access and the Editor-in-Chief of the Journal of Electrical Engineering (I’manager). He was a former Associate Editor of IEEE Transactions on Industry Application and a former Guest Associate Editor of IEEE Transactions on Power Electronics. His research interests include smart grids, complex energy transition, active distribution networks, electric vehicles drivetrain, sustainable development and energy security, distributed energy generation, and multiphase motor drive systems.

Farhad Ilahi Bakhsh

Farhad Ilahi Bakhsh (Senior Member, IEEE) received a B.Tech degree in Electrical Engineering and a M.Tech. degree in Power Systems & Drives from Aligarh Muslim University (AMU), Aligarh, India, in 2010 and 2012, respectively. Then he pursued a Ph.D. degree from the Indian Institute of Technology Roorkee, India, in 2017. During his Ph.D. he developed a new method for grid integration for wind energy generation systems which has been recognized worldwide. He served as an Assistant Professor in the Department of Electrical & Renewable Energy Engineering, School of Engineering & Technology, Baba Ghulam Shah Badshah University, Rajouri, J & K, India. He developed an automatic solar tracking system which has been appreciated by IEEE India Council, Centre for Embedded Product Design, Centre for Electronics Design and Technology, Netaji Subhas Institute of Technology in association with IEEE Delhi Section & IEEE CAS, Bangalore Chapter. Currently, he is serving as an Assistant Professor in the Department of Electrical Engineering, National Institute of Technology Srinagar, Jammu & Kashmir, India. He is the founder and Counselor of the IEEE Student Branch, at NIT Srinagar.

Anshul Baghel

Anshul Baghel completed his B.Tech and M.Tech in 2020 and 2022 respectively from Aligarh Muslim University. His research area is in the area of power converters especially in the area of Multi-Level Inverters.