Abstract
An 11-level switched-capacitor multilevel inverter (SCMLI) with 2.5 times boosting feature is presented in this paper. It can produce an 11-level output voltage waveform by utilizing 14 switches, 3 capacitors, 2 diodes, and 1 DC source. Only nine driver circuits are needed as the topology has three pairs of complementary switches and two bidirectional switches. It has inherent capacitor self-balancing property as the capacitors are connected across the DC voltage source during several states within a fundamental cycle to charge the capacitors to the input voltage. A detailed comparison shows the effectiveness of the proposed topology in terms of the number of switches, number of capacitors, number of sources, total standing voltage (TSV), efficiency, and boosting ability with the state-of-art recently proposed circuits. Subsequently, the performance of the proposed SCMLI is validated experimentally utilizing the nearest level control (NLC), a fundamental frequency-based switching technique.
Highlights
Inverters play a vital part in various industrial applications such as renewable energy generation systems (REGS), grid integration of photovoltaic systems, electric vehicles, flexible AC transmission systems, and motor drives
Three types of losses are considered for the proposed switched-capacitor multilevel inverter (SCMLI) topology, including charging or ripple loss, conduction loss, and switching loss occurring in the system
The smooth results showing a sudden change in load and modulation index verify the performance of the proposed inverter
Summary
Inverters play a vital part in various industrial applications such as renewable energy generation systems (REGS), grid integration of photovoltaic systems, electric vehicles, flexible AC transmission systems, and motor drives. MLI topologies are classified into three conventional types: diode clamped, cascaded H-bridge, and flying capacitor [3] These conventional MLIs suffer from various demerits, such as the need for a higher number of components as the output levels are increased, capacitor voltage balancing problem, and absence of self-voltage-boosting feature [4,5]. Switched-capacitor MLIs (SCMLIs) with selfbalancing and voltage-boosting capability, using a lesser number of device components and reduced control complexity, have come up in recent times [10,11,12,13,14]. An 11-level SCMLI topology is proposed to have 2.5 times voltage boosting with reduced component count and reduced TSV. A detailed comparison is carried out to justify the merits of the proposed topology against the other recently published topologies
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