Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 36, Issue 4, Pages 4352-4359Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2020.3019223
Keywords
Capacitors; Switches; Inverters; Topology; Semiconductor diodes; Renewable energy sources; Power supplies; Multilevel inverter; nearest level control technique; switched-capacitor; voltage self-balancing
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This article presents a novel high step-up multilevel inverter suitable for renewable energy applications with low-voltage dc source. The proposed design features voltage self-balancing, production of bipolar staircase waveform, and reduction of voltage stress on components.
This article presents a novel high step-up multilevel inverter (MLI) with a single dc source based on switched-capacitor modules in which it is suitable for the renewable energy applications with low-voltage dc source. The proposed topology has the ability of the voltage self-balancing for the capacitors without any external or closed-loop circuits. Another merit of the proposed structure is the production of bipolar staircase waveform without any end-side full-bridge in which it reduces the voltage stress on components remarkably. The circuit topology and its operation principle, capacitance calculations and comparison of the proposed circuit with other well-known single-source MLIs are discussed in detail. Finally, a 21-level prototype of the proposed inverter with 32 V input voltage and high gain 10 by using four modules was evaluated by both simulation and experimental tests.
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