A family of switched-impedance network enhanced-boost quasi-z-source inverters

Vadthya Jagan, Mithun Kumar Reddy Alpuri, Neeharika Mandava, Cheruku Swetha, Pedekala Mahendar, Sharmili Das

Abstract


This paper proposes a family of novel enhanced-boost quasi-Z-source inverters (EB-qZSIs). For the similar input voltage and shoot-through duty ratio, similar to that of enhanced-boost Z-source inverter/enhanced-boost qZSIs, the presented topologies provide very high voltage boost at high modulation index with improved quality output waveform. Compared to EB-ZSI and EB-qZSIs, these topologies provide less capacitors stress, which reduce the volume and cost of the system. Akin to traditional EB-qZSIs, the presented novel impedance networks share joint ground with the source and inverter bridge, also reduces the initial inrush current. Among the four types of proposed configurations, the type-1 of discontinuous input current (DIC) EB-qZSIs offers fewer stress athwart the capacitors and little inrush current at start-up condition. Consequently, type-1 is considered and illustrated for the examination, simulation and hardware execution. The steady-state operation and derivation of boost factor, peak dc-link voltage and capacitor voltages are derived for both continuous conduction mode (CCM) and discontinuous conduction modes (DCM). The Z-network elements design, and evaluation with other Z-networks are also carried out. Lastly, the hypothetical investigation is confirmed with simulation and experimental tests.

Keywords


direct current-alternating current power conversion; enhanced-boost Z-source inverters; discontinuous conduction mode; magnetically-coupled Z-source networks; T-source inverter



DOI: http://doi.org/10.11591/ijpeds.v13.i1.pp%25p

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