Small signal modeling of the Quasi-Z-Source-Inverter and a novel control strategy to minimize the influence of input voltage disturbances

Author

Lannert, Thomas ; Isen, Matthias ; Braun, Martin

Author_Institution

Elektrotech. Inst. (ETI), Karlsruhe Inst. of Technol. (KIT), Karlsruhe, Germany

fYear

2013

fDate

2-6 Sept. 2013

Firstpage

1

Lastpage

10

Abstract

The Quasi-Z-Source-Inverter (QZSI) reveals an asymmetrical L-C-network structure in which unwanted oscillations can be triggered by input voltage disturbances (IVD). This paper presents an AC small signal model of the QZSI, derived from State Space Averaging, with emphasis on the influence of IVD. After the discussion of the small signal model, a novel cascade control strategy is developed to adequately compensate the influence of IVD on the DC-link voltage. The effectiveness of the proposed control strategy is verified by simulation and experimental results on a laboratory test bench with an induction machine as load.

Keywords

asynchronous machines; cascade control; invertors; power control; state-space methods; asymmetrical LC network structure; cascade control strategy; induction machine; input voltage disturbances; quasi Z source inverter; small signal modeling; state space averaging; Capacitors; Inductors; Load modeling; Mathematical model; Switches; Transfer functions; Voltage control; Adjustable speed drive; Control methods for electrical systems; Modeling; Test bench;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Electronics and Applications (EPE), 2013 15th European Conference on

Conference_Location

Lille

Type

conf

DOI

10.1109/EPE.2013.6631933

Filename

6631933