Dual Z-source inverter with three-level reduced common mode switching

Gao, Feng, Loh, Poh Chiang, Blaabjerg, Frede, & Vilathgamuwa, D. Mahinda (2006) Dual Z-source inverter with three-level reduced common mode switching. In Conference Record of the 2006 IEEE Industry Applications Conference 41 st IAS Annual Meeting, IEEE, Tampa, Florida, pp. 619-626.

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Abstract

This paper presents the design of a dual Z-source inverter that can be used with either a single dc source or two isolated dc sources. Unlike traditional inverters, the integration of a properly designed Z-source network and semiconductor switches to the proposed dual inverter allows buck-boost power conversion to be performed over a wide modulation range with three-level output waveforms generated. The connection of an additional transformer to the inverter ac output also allows all generic wye- or delta-connected loads with three-wire or four-wire configuration to be supplied by the inverter. Modulation-wise, the dual inverter can be controlled using a carefully designed carrier-based pulse-width modulation (PWM) scheme that always will ensure balanced voltage boosting of the Z-source network, while simultaneously achieving reduced common-mode switching. Because of the omission of dead-time delays in the dual inverter PWM scheme, its switched common-mode voltage can be completely eliminated, unlike in traditional inverters where narrow common-mode spikes are still generated. Under semiconductor failure conditions, the presented PWM schemes can easily be modified to allow the inverter to operate without interruption and for cases where two isolated sources are used, zero common-mode voltage can still be ensured. These theoretical findings together with the inverter practicality have been confirmed both in simulations using PSIM with Matlab/Simulink coupler and experimentally using a laboratory implemented inverter prototype.

Impact and interest:

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ID Code: 74238
Item Type: Conference Paper
Refereed: No
Keywords: Z-source inverters, Dual inverters, Reduced common mode switching, Three-level inverters, Buck boost
DOI: 10.1109/IAS.2006.256591
ISBN: 1424403642
ISSN: 0197-2618
Divisions: Current > Schools > School of Electrical Engineering & Computer Science
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Deposited On: 22 Jul 2014 22:50
Last Modified: 24 Jul 2014 02:06

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