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Small Signal Modeling of the Quasi-Z-Source-Inverter and a Novel Control Strategy to Minimize the Influence of Input Voltage Disturbances

Small Signal Modeling of the Quasi-Z-Source-Inverter and a Novel Control Strategy to Minimize the Influence of Input Voltage Disturbances
Author:

Thomas Lannert, Matthias Isen, Michael Braun

Source:

EPE'13 ECCE Europe

15th European Conference on Power Electronics and Applications

 

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.