access icon free Single-phase ac–dc–ac multilevel five-leg converter

In this study, a multilevel five-leg single-phase ac–dc–ac converter and its generalisation are presented. The converter is suitable to be used as an uninterrupted power supply or a unified power quality conditioner without an isolation transformer. The operating principles, the pulse-width modulation strategy and the control system for the proposed converter are presented. The proposed single-phase multilevel ac–dc–ac converter is composed mostly of low-power switches capable of generating input and output voltages with low harmonic content. The proposed configuration is compared with the conventional solution in terms of harmonic distortion, semiconductor losses and ratings of switches. Experimental results demonstrate the feasibility of the proposed configuration. The experimental verification of the proposed topology and control strategy was obtained by using IGBTs with dedicated drives and a digital signal processor TMS320F28335 with plug-in boards and sensors.

Inspec keywords: voltage control; power conversion harmonics; power system control; DC-AC power convertors; power supply quality; AC-DC power convertors; low-power electronics; switches; harmonic distortion; electric current control; PWM power convertors

Other keywords: uninterrupted power supply; low-power switches; TMS320F28335; IGBT; harmonic distortion; multilevel five-leg converter; single-phase AC–DC–AC converter; harmonic content; isolation transformer; unified power quality conditioner; control strategy; plug-in boards; pulse-width modulation strategy; control system; semiconductor losses; digital signal processor

Subjects: Power supply quality and harmonics; Power electronics, supply and supervisory circuits; Voltage control; AC-DC power convertors (rectifiers); Control of electric power systems; Current control; Power system control; DC-AC power convertors (invertors)

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http://iet.metastore.ingenta.com/content/journals/10.1049/iet-pel.2013.0833
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