Abstract
A novel three-phase switched-capacitor multilevel inverter (SCMLI) with reduced capacitance and balanced neutral-point voltage is proposed in this paper. Applying only one DC source, the three-phase seven-level topology possessing voltage-boosting capability is accomplished without the high-voltage stress of power switches. Owing to the inherent redundant switching states of the proposed topology, two charging approaches that can effectively limit the voltage ripples and path selection for capacitors can be realized. This provides the presented topology with reduced capacitance, balanced neutral-point voltage, good performance in not only the three-phase four-wire system but also the three-phase three-wire system, and low total harmonic distortion (THD) of the output voltage. A comprehensive comparison with previous SCMLIs in various aspects is conducted to validate the merits mentioned above. The simulation results accord with theoretical analyses, confirming the feasibility of the proposed three-phase SCMLI.
Highlights
Wuhan National High Magnetic Field Center, School of Electrical and Electronic Engineering, Abstract: A novel three-phase switched-capacitor multilevel inverter (SCMLI) with reduced capacitance and balanced neutral-point voltage is proposed in this paper
Since the input voltage is relatively low compared with the output voltage, boost circuits [13,14] are required in many applications, such as grid-connected photovoltaic modules, distributed generation (DG) systems, and electric vehicles
The voltage variation of floating capacitors that comes from ibus in proposed topology is smaller than 2Ts, which is much shorter than th canthe be calculated as follows: traditional SCMLIs
Summary
Employing one DC source and eight capacitors, it can generate seven voltage levels The capacitors’ rated voltage is UN = 0.5 Vdc. Bidirectional switches are used to block positive and negative. Dc, source and eight capacitors, it can generate seven voltage levels The capacitors’ rated voltage is UN = 0.5 Vdc. Bidirectional switches are used to block positive and negative voltage voltage stress. The floating capacitors to generate the top voltage level. N are posed topology is used is in used a three-phase four-wirefour-wire system when. 2b,e, the the black andand red red devices represent twotwo different paths.
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