Seven Level Cascaded H-bridge Multilevel Inverter with Discrete Variation of DC Sources

Document Type : Original Article

Authors

Faculty of Electrical and Computer Engineering, Jundi Shapur University of Technology-Dezful, Khuzestan, Iran

Abstract

In low switching frequency strategies, regulated DC sources along with the switching angles increase the system’s degrees of freedom to effectively mitigate or eliminate harmonics. Utilizing the variable DC sources increase the cost, losses and complexity of the system. This paper presents a new method for cascaded H-bridge multilevel inverters based on discrete variable DC source to reduce number of the regulated DC sources. In this paper, an optimization procedure for output voltage regulation is devised based on the discrete variable DC sources, which results in  effective reduction of harmonics and improvement of the output voltage quality. In the optimization method, the near optimum values of DC sources and switching angles are obtained using multi objective genetic algorithm. To verify the feasibility of the new solution, a laboratory prototype is implemented based on seven level cascaded H-bridge inverter with three cells in each phase. Simulation and experimental results validate the effectiveness of the proposed method based on the discrete variable DC sources in reduction of  harmonics and voltage regulation.

Keywords

References

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TABRIZ JOURNAL OF ELECTRICAL ENGINEERING
Volume 49, Issue 4 - Serial Number 90
February 2020
Pages 1505-1515

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