Journal
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
Volume 69, Issue 6, Pages 5735-5744Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIE.2021.3086725
Keywords
Capacitors; Inverters; Switches; Transistors; Switching circuits; Topology; Stress; Multilevel inverter (MLI); selective harmonic eliminated (SHE) modulation; switched capacitor (SC)
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Funding
- National Natural Science Foundation of China [51907033]
- Natural Science Foundation of Guangdong Province [2020A1515110977, 2021A1515012276]
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Two 17-level inverters based on switched capacitor are proposed, featuring improved modulation strategy and unique topology for effective suppression of low-order harmonics and high-quality output voltage waveform.
Two 17-level inverters based on switched capacitor (SC) are presented in this article. Each of them involves two SC units and a neutral-point-piloted unit. A total of four pairs of transistors, a bidirectional switch, two pairs of diodes, and three pairs of capacitors are employed. All of the switching components are controlled by six pulsewidth modulation signals and all capacitors' voltages are self-balanced. With an improved selective harmonic eliminated modulation strategy, low-order harmonics are effectively suppressed and switches operate in low switching frequency. In addition to the use of fewer components, high-quality output voltage shape is benefited from the unique topology and reduced capacitor voltage ripple accumulation. Experiment results demonstrate the excellent performance of the proposed inverter. High efficiency is also achieved and the maximum value is up to 98.05%.
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