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All Journal International Journal of Power Electronics and Drive Systems (IJPEDS) Indonesian Journal of Electrical Engineering and Computer Science
Wail Ali Ali Saleh
Universiti Teknikal Malaysia Melaka
Control & Systems Engineering Electrical & Electronics Engineering

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Harmonic minimization of a single-phase asymmetrical TCHB multilevel inverter based on nearest level control method Wail Ali Ali Saleh; Nurul Ain Mohd Said; Wahidah Abd Halim
International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 11, No 3: September 2020
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (522.042 KB) | DOI: 10.11591/ijpeds.v11.i3.pp1406-1414

Abstract

Multilevel inverters are gaining special interest among researchers and in the industry due to their widespread applications and numerous merits. Obtaining high quality, more reliable output while using a reduced number of electronic components is the main purpose of most of the research conducted in this area of study. The purpose of this study is to apply the nearest level control (NLC) method to a 13-level transistor-clamped H-bridge (TCHB) inverter with unequal DC voltage supplies. The NLC method operates at the fundamental frequency, thus reducing switching losses, and can reduce the harmonic content significantly. The adopted multilevel inverter consists of two TCHB cells supplied with two asymmetrical DC input sources with a voltage ratio of 1:2. This structure reduces the number of electronic components, and the asymmetry in the DC input voltages results in a higher number of levels. The adopted topology and its proposed control method were simulated in Matlab/Simulink, and the simulation results were verified through experiments using an Altera field-programmable gate array (FPGA) board. The results showed that the topology and its control method are efficient in obtaining a high-quality output with an improved total harmonic distortion (THD).
Voltage harmonics reduction in single phase 9-level transistor clamped H-bridge inverter using nearest level control method Nurul Ain Mohd Said; Wail Ali Ali Saleh; Wahidah Abd Halim
Indonesian Journal of Electrical Engineering and Computer Science Vol 20, No 3: December 2020
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v20.i3.pp1725-1732

Abstract

This paper proposes a nearest level control method based modulation scheme for a 9-level symmetrical Transistor Clamped H-bridge (TCHB) inverter. The topology has gained increasing research focus due to its advantages in obtaining high quality output while using a reduced number of electronic components. The device count for obtaining a 9-level output voltage is it uses 10 active switches as compared to the 16 being used in a conventional 9-level cascaded H-Bridge (CHB) inverter. The significant contribution of the research is the development of the NLC modulation technique that operates at the fundamental frequency, thus reducing switching losses, and able to reduce harmonic content significantly. The reduced harmonic content can lessen the power quality problem. The NLC modulation scheme, shows that the overall THD is reduced without the need for filtration. The 50 values of harmonic content will be count that follows the IEEE Standard 519. MATLAB/Simulink based simulations and experimental results obtained from the laboratory prototype of a single-phase TCHB inverter feeding a R load validate the theoretical analyses and effectiveness of the proposed modulation scheme.
Comparison between selective harmonic elimination and nearest level control for transistor clamped H-bridge inverter Wail Ali Ali Saleh; Nurul Ain Mohd Said; Wahidah Abd Halim; Auzani Jidin
Indonesian Journal of Electrical Engineering and Computer Science Vol 26, No 1: April 2022
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v26.i1.pp46-55

Abstract

Total harmonic distortion (THD) is a key index used to measure the quality of output waveforms in multilevel inverters. In this paper the THD is investigated and compared between two modulation methods; selective harmonic elimination and nearest level control, for 13-level transistor clamped H-bridge (TCHB) inverter. The selected TCHB topology employs a reduced number of DC sources and switches compared with other conventional multilevel inverters, which helps to reduce the size and cost of the inverter. The performance of both modulation methods has been validated through simulations using MATLAB/Simulink. The results show that for selective harmonic elimination, the 13-level output exists for a narrow range of modulation index, M (0.687≤M≤0.694),while for nearest level control method, the 13-level output exists for a wider range of M (M≥0.917), which means the 13-level output exists for different ranges of  for both methods. The THD obtained from both methods fulfills the IEEE Std 519-2014 standard of harmonics. Nearest level control method is conceptually simple and produces better THD results compared with selective harmonic elimination method.distortion (THD) is a key index used to measure the quality of output waveforms in multilevel inverters. In this paper the THD is investigated and compared between two modulation methods; selective harmonic elimination and nearest level control, for 13-level transistor clamped H-bridge (TCHB) inverter. The selected TCHB topology employs a reduced number of DC sources and switches compared with other conventional multilevel inverters, which helps to reduce the size and cost of the inverter. The performance of both modulation methods has been validated through simulations using MATLAB/Simulink. The results show that for selective harmonic elimination, the 13-level output exists for a narrow range of modulation index,  (), while for nearest level control method, the 13-level output exists for a wider range of  (), which means the 13-level output exists for different ranges of  for both methods. The THD obtained from both methods fulfills the IEEE Std 519-2014 standard of harmonics. Nearest level control method is conceptually simple and produces better THD results compared with selective harmonic elimination method
Co-Authors Auzani Jidin Nurul Ain Mohd Said Wahidah Abd Halim