Backstepping Control Associated to Modified Space Vector Modulation for Quasi Z-source Inverter Fed by a PEMFC

Received: 4 January 2019 Accepted: 10 March 2019 In this paper, a backstepping control combined with a modified space vector modulation (MSVM) for a quasi z-source inverter (QZSI) fed by a fuel cell is proposed. The QZSI employs a unique impedance network to couple the main circuit of the inverter to a proton exchange membrane fuel cell (PEMFC). This topology provides an attractive single stage DC-AC conversion with buck-boost capability unlike the traditional voltage source inverter (VSI). The MSVM is used to insert the shoot through state within the traditional switching signals in order to boost the inverter input voltage, and to keep the same performances of the traditional SVM. A DC peak voltage controller using backstepping approach is proposed to overcome the fuel cell voltage fluctuations under load changes, and to reduce the inductor current ripples as well. Comprehensive simulations are presented to prove the effectiveness and the performances of the proposed control strategy under different operating conditions.

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