《《IEEE_-_Z_Source_Inverter》.pdf

504 IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS, VOL. 39, NO. 2, MARCH/APRIL 2003 Z-Source Inverter Fang Zheng Peng, Senior Member, IEEE Abstract— This paper presents an impedance-source (or impedance-fed) power converter (abbreviated as Z-source con- verter) and its control method for implementing dc-to-ac, ac-to-dc, ac-to-ac, and dc-to-dc power conversion. The Z-source converter employs a unique impedance network (or circuit) to couple the converter main circuit to the power source, thus providing unique features that cannot be obtained in the traditional voltage-source (or voltage-fed) and current-source (or current-fed) converters where a capacitor and inductor are used, respectively. The Z-source converter overcomes the conceptual and theoretical barriers and limitations of the traditional voltage-source converter (abbreviated as V-source converter) and current-source converter (abbreviated as I-source converter) and provides a novel power conversion concept. The Z-source concept can be applied to all Fig. 1. Traditional V-source converter. dc-to-ac, ac-to-dc, ac-to-ac, and dc-to-dc power conversion. To describe the operating principle and control, this paper focuses on an example: a Z-source inverter for dc-ac power conversion needed in fuel cell applications. Simulation and experimental results will be presented to demonstrate the new features. Index Terms—Converter, current-source inverter, inverter, voltage-source inverter, Z-Source inverter. I. INTRODUCTION HERE EXIST two traditional converters: