A Hybrid Multilevel Inverter with Both Staircase and PWM Switching Schemes
In this paper, a new method to control multilevel converters is proposed. The considered multilevel converter consists of a three-phase three-level diode-clamped converter (main converter). Two H-bridge cells are then connected in series with each output phase of the main converter. The operation of the main converter and one of the cascading H-bridge cells is based on the staircase switching method. The firing angles of these converters are selected in a way that the dc voltage required for the last H-bridge cell is minimized. The switching pattern of the second H-bridge cell is based on the pulse-width modulation method. This last cell generates the remaining parts of the desired sinusoidal output voltage. The combination of these converters and their switching methods result in an output waveform with low harmonics. Here, a fifteen-level converter is designed based on this approach. Simulation results and laboratory measurements verify the effectiveness of the proposed topology and modulation method.
H. Sepahvand et al., "A Hybrid Multilevel Inverter with Both Staircase and PWM Switching Schemes," Proceedings of the 2nd Annual IEEE Energy Conversion Congress and Exposition (2010, Atlanta, GA), pp. 4364 - 4367, Institute of Electrical and Electronics Engineers (IEEE), Sep 2010.
The definitive version is available at https://doi.org/10.1109/ECCE.2010.5618451
2nd Annual IEEE Energy Conversion Congress and Exposition (2010: Sep. 12-16, Atlanta, GA)
Electrical and Computer Engineering
Keywords and Phrases
DC Voltage; Diode-Clamped; Firing Angle; Fundamental Switching; H-Bridge Cell; H-Bridge Cells; Hybrid Multilevel Inverter; Inverter; Laboratory Measurements; Level Converter; Modulation Methods; Multilevel Converter; Multilevel Inverter; Output Phase; Output Waveform; PWM Switching; Simulation Result; Sinusoidal Output; Switching Methods; Switching Patterns; Three-Level; Counting Circuits; Energy Conversion; Modulation; Pulse Width Modulation; Stairs; Switching; Voltage Control; Electric Inverters; Fundamental Switching
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Article - Conference proceedings
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01 Sep 2010