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All Journal International Journal of Applied Power Engineering (IJAPE)
Md Hairul Nizam Talib
Universiti Teknikal Malaysia Melaka
Electrical & Electronics Engineering

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Power losses analysis for reduced switch 9-level cascaded H-bridge multilevel inverter Ismail, Mohammad Haziq; Isa, Zainuddin Mat; Arshad, Mohd Hafiz; Mid, Ernie Che; Ismail, Baharuddin; Talib, Md Hairul Nizam
International Journal of Applied Power Engineering (IJAPE) Vol 13, No 4: December 2024
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijape.v13.i4.pp808-814

Abstract

This study provides a thorough examination of power losses and total harmonic distortion (THD) in single-phase 9-level cascaded H-bridge multilevel inverters (CHB MLI) at low switching frequencies. The aim is to analyze the efficiency of a single-phase 9-level cascaded CHB MLI using three distinct switch configurations: 16-switch, 11-switch, and proposed 8-switch. The calculated switching angles are optimized using the feed-forward methodology. Two types of load conditions—R load and R-L load—are being examined. The results suggest that the proposed 8-switch design exhibits superior efficiency by limiting power losses compared to other topologies. Regarding THD, the conventional topology yields a somewhat lower value, however, the disparity is less than 1% when compared to both reduced switch topologies.
Hysteresis current control for single-phase transformerless inverter Mohd Azhar, Aina Suhailah; Azri, Maaspaliza; Abd Halim, Wahidah; Talib, Md Hairul Nizam; Rasin, Zulhani; Mohammed, Mohd Fayzul
International Journal of Applied Power Engineering (IJAPE) Vol 14, No 1: March 2025
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijape.v14.i1.pp1-10

Abstract

The total harmonic distortion (THD) of grid current and leakage current are significant for transformerless inverters, as they impact power quality, efficiency, and compliance with grid codes. Monitoring and minimizing these currents ensure safe and reliable grid integration of photovoltaic (PV) systems while reducing electromagnetic interference. Therefore, in this paper, the analysis THD of grid current and leakage current is described. The bipolar pulse width modulation (BPWM) technology provides a stable common-mode voltage (200 V), fewer leakage currents (< 30 mA), and better system efficiency, compared to the unipolar pulse width modulation (UPWM) technique. To ensure the inverter complies with the IEC 61000-3-2 class C (THDi < 5%), the current control strategy should be considered during the design of the transformerless inverter. Therefore, this paper presents an implementation and evaluation of the bipolar hysteresis current control (BHCC) technique. In comparison to the BPWM technique, the BHCC technique delivers lower leakage current (0.007274 A), reduced grid current harmonic distortion (1.81%), and increased efficiency.
Co-Authors Abd Halim, Wahidah Arshad, Mohd Hafiz Isa, Zainuddin Mat Ismail, Baharuddin Ismail, Mohammad Haziq Maaspaliza Azri Mid, Ernie Che Mohammed, Mohd Fayzul Mohd Azhar, Aina Suhailah Rasin, Zulhani