Converter Utilization Ratio Enhancement in the THD Optimization of Cascaded H-Bridge 7-level Inverters

Reza Khamooshi; Alireza Namadmalan; Javad Shokrollahi Moghani

Converter Utilization Ratio Enhancement in the THD Optimization of Cascaded H-Bridge 7-level Inverters

Reza Khamooshi

Alireza Namadmalan

Javad Shokrollahi Moghani

Vol. 16, No. 1, pp. 173-181, Jan. 2016

10.6113/JPE.2016.16.1.173

Cascaded H-bridge multi-level inverter

Optimization Methods

Switch Utilization Ratio

Total harmonic distortion

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Abstract

In this paper, a new technique for harmonic optimization in cascaded H-bridge 7-level inverters is proposed. The suggested strategy is based on minimizing an objective function which simultaneously optimizes the converter utilization and Total Harmonic Distortion (THD). The Switch Utilization Ratio (SUR) is formulized for both the phase and line-line voltages of a 7-level inverter and is considered in the final objective functions. Based upon the SUR formula, utilization ratio enhancement will reduce the value of feeding DC links, which improves the efficiency and lifetime of the circuit components due to lower voltage stresses and losses. In order to achieve more effective solution in different modulation indices, it is assumed that the DC sources can be altered. Experimental validation is presented based on a three-phase 7-level inverter prototype.

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Cite this article

[IEEE Style]

R. Khamooshi, A. Namadmalan, J. S. Moghani, "Converter Utilization Ratio Enhancement in the THD Optimization of Cascaded H-Bridge 7-level Inverters," Journal of Power Electronics, vol. 16, no. 1, pp. 173-181, 2016. DOI: 10.6113/JPE.2016.16.1.173.

[ACM Style]

Reza Khamooshi, Alireza Namadmalan, and Javad Shokrollahi Moghani. 2016. Converter Utilization Ratio Enhancement in the THD Optimization of Cascaded H-Bridge 7-level Inverters. Journal of Power Electronics, 16, 1, (2016), 173-181. DOI: 10.6113/JPE.2016.16.1.173.