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

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.

Keywords

Multilevel inverter, Single-source, Switched-capasitor, Step-up converter, Self-balancing

DOI

10.1109/TPEL.2020.3036351

Citation

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

Permanent link to this item

https://urn.fi/URN:NBN:fi:aalto-2020113020603

Collections

[article-cris] Sähkötekniikan korkeakoulu / ELEC

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