Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 34, Issue 5, Pages 4014-4018Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2018.2873188
Keywords
Multilevel inverters (MLIs); nine-level switched-capacitor inverter (9LSCI); quadruple boost; self-voltage balance
Categories
Funding
- National Natural Science Foundation of China [61573155, 51877085]
- Guangdong Natural Science Foundation [2016A030313508]
- Guangdong Science and Technology Planning [2016A010102007]
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A novel single-phase nine-level switched-capacitor inverter (9LSCI) is presented with quadruple boost ability and reduced components. The proposed topology with single dc source employs only eight switches to realize nine-level output, self-voltage balance of capacitors, quadruple boost and inductive-load ability, thus, the effective cost is cut down compared to other switched-capacitor multilevel inverters (SCMLIs). Different from other SCMLIs, the proposed 9LSCI has no need for back-end H-bridge, of which four switches need to withstand the peak voltage of output. Hence, total standing voltage can be reduced. The operation principles containing the self-voltage balance of capacitors are described in detail. The quantitative comparisons, modified cost function, as well as the loss evaluations are examined in depth. Finally, multicarrier phase disposition pulsewidth modulation method is adopted and a laboratory prototype is implemented with the rated output of 220 V-500 W. The experimental results also verify the feasibility of the proposed topology.
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