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Energies 2019, 12(6), 977;

A New Hybrid Multilevel Inverter Topology with Reduced Switch Count and dc Voltage Sources

Department of Electrical Engineering at Rabigh, King Abdulaziz University, Jeddah 25732, Saudi Arabia
Centre of Electrical Energy Systems, Department of Electrical Power Engineering, Universiti Teknologi Malaysia, 81310 Johor Bahru, Malaysia
Author to whom correspondence should be addressed.
Received: 22 January 2019 / Revised: 6 March 2019 / Accepted: 8 March 2019 / Published: 13 March 2019
(This article belongs to the Section Electrical Power and Energy System)
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In this paper, a new single-phase hybrid multilevel inverter (MLI) is proposed. Compared to other existing MLI topologies, the proposed circuit is capable of producing a higher number of output voltage levels using fewer power switches and dc sources. The levels are synthesized by switching the dc voltage sources in series/parallel combinations. An auxiliary circuit is introduced to double the number of levels by creating an intermediate step in between two levels. In addition, a zero level is introduced to overcome the inherent absence of this level in the original circuit. To improve the total harmonic distortion, a hybrid modulation technique is utilized. The operation and performance of the circuit are analyzed and confirmed using MATLAB/Simulink simulation. To validate the workability of the proposed idea, a 300 W, a thirteen level MLI (including the zero level) is designed and constructed. The circuit is tested with a no-load, resistive load and resistive-inductive load. The experimental results match very closely with the simulation and mathematical analysis. View Full-Text
Keywords: multilevel inverter; dc-ac power converter; PWM technique; power conversion multilevel inverter; dc-ac power converter; PWM technique; power conversion

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Bassi, H.M.; Salam, Z. A New Hybrid Multilevel Inverter Topology with Reduced Switch Count and dc Voltage Sources. Energies 2019, 12, 977.

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