Circuit Configuration and Modulation of a Seven-Level Switched-Capacitor Inverter

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

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en

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10

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IEEE Transactions on Power Electronics, Volume 36, issue 6, pp. 7087-7096

Abstract

In this article, a step-up seven-level inverter supplied by a single dc source suitable for renewable energy application is presented. Forming the desired output is realized by charging capacitors and synthesizing them based on a switched-capacitor concept. This structure is praised for the ability of sensorless voltage balancing of the capacitors, reducing control complexity to produce a bipolar staircase waveform. It also benefits from regenerative performance, avoiding unwanted capacitors overvoltage. A phase disposition pulsewidth modulation (PD-PWM) technique is utilized to control the circuit operation. Furthermore, a comparison with other recent topologies reveals that losses, number of semiconductor devices, and gate driver circuits are reduced. Theoretical analysis is verified through a laboratory prototype implementation. Experimental results under various types of loads approve the performance of the proposed inverter and validity of the design. Finally, maximum experimental efficiency of 94.3% (115 V, 250 W load) was reached.

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Khodaparast, A, Hassani, M, Azimi, E, Adabi, M E, Adabi, J & Pouresmaeil, E 2020, 'Circuit Configuration and Modulation of a Seven-Level Switched-Capacitor Inverter', IEEE Transactions on Power Electronics, vol. 36, no. 6, 9250604, pp. 7087-7096. https://doi.org/10.1109/TPEL.2020.3036351