An Efficacious Modulation Gambit Using Fewer Switches in a Multilevel Inverter

Sathyavani Bandela, Tara Kalyani Sandipamu, Hari Priya Vemuganti, Shriram S. Rangarajan (), E. Randolph Collins and Tomonobu Senjyu
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Sathyavani Bandela: Department of Electrical and Electronics Engineering, S R University, Warangal 506371, India
Tara Kalyani Sandipamu: Department of Electrical and Electronics Engineering, Jawaharlal Nehru Technological University, Hyderabad 500085, India
Hari Priya Vemuganti: Department of Electrical Engineering, National Institute of Technology, Raipur 492010, India
Shriram S. Rangarajan: Department of Electrical and Electronics Engineering, Dayananda Sagar College of Engineering, Bengaluru 560078, India
E. Randolph Collins: Department of Electrical and Computer Engineering, Clemson University, Clemson, SC 29634, USA
Tomonobu Senjyu: Department of Electrical and Electronics Engineering, University of the Ryukyus, Okinawa 903-0213, Japan

Sustainability, 2023, vol. 15, issue 4, 1-21

Abstract: Since multicarrier based modulation techniques are simple to implement and can be used to control inverters at any level, they are frequently employed in modern multilevel inverters in high or medium power applications. When considering the many multi-carrier modulation techniques available, level-shifted pulse-width modulation (LSPWM) is often chosen for its superior harmonic performance. However, this traditional LSPWM method is not suitable for controlling newly proposed reduced switch count (RSC) MLI topologies. The research work in this paper seeks to elucidate the reasons why conventional LSPWM is ineffective in controlling RSC MLI topologies, and proposes a generalized LSPWM system based on logical expressions. The proposed method can be utilized with symmetrical and asymmetrical RSC MLIs, and can be extended to an arbitrary number of levels. The merit of the proposed method for controlling any RSC configuration with satisfactory line-voltage THD (≈1.8%) performance (identical to conventional LSPWM) was evaluated using multiple 13-level asymmetrical RSC-MLI topologies. A MATLAB model was developed and then subjected to simulation and real-world testing to prove the effectiveness of the proposed modulation strategy.

Keywords: multilevel inverters (MLI); reduced switch count (RSC); pulse-width modulation (PWM); multilevel DC link (MLDCL); packed U-cell (PUC); cascaded bi-polar switched cells (CBSC); reverse voltage (RV); envelope-type (E-type); cascaded H-bridge (CHB); selective harmonic elimination (SHE); hexagonal switched cell (HSC); series parallel switched sources (SPSS); series connected switched sources (SCSS); total harmonic distortion (THD); switched DC sources (SDS); in-phase disposition (IPD) (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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