Title :
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
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;
Conference_Titel :
Power Electronics and Applications (EPE), 2013 15th European Conference on
Conference_Location :
Lille
DOI :
10.1109/EPE.2013.6631933
