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Single-phase quasi-Z source inverter (qZSI) needs large capacitance, and its switching loss is high when controlled by traditional SPWM. In this paper, a new modulation method for single-phase qZSI is proposed, which combines SPWM and pulse-width-amplitude modulation (PWAM), as a result of hybrid modulation. SPWM is employed at low dc-link voltage to avoid shoot-through state and act switching at...
The double-line-frequency (2ω) power ripple of single-phase quasi-Z-source (qZS) Photovoltaic (PV) inverter highly affects the whole system's design and performance. In this paper, a comprehensive modeling for single-phase qZS PV inverter is proposed, where the 2ω-ripple models of qZS inverter system served by real PV source are established and discussed on cases of with and without PV terminal capacitor...
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