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In traditional three-level neutral-point-clamped (NPC) inverters, a major issue is capacitor voltage imbalance, which results in low order harmonics. The compensation of the capacitor voltages often require additional control complexity, which cannot be conveniently implemented. The "alternative phase opposition disposition" (APOD) modulation method used in traditional NPC topologies also...
This paper presents the operational analysis and performance comparison of various current-type Z-source inverters. With an X-shaped LC impedance network added, all current-type Z-source inverters can perform current buck-boost operation with expected output performance except of the case where modulation index is tuned to be lower than the physical boundary between linear modulation and distorted...
This paper presents various embedded Z-source (EZ-source) inverters broadly classified as shunt or parallel embedded Z-source inverter. Being different from the traditional Z-source inverter, EZ-source inverters are constructed by inserting dc sources into the X-shaped impedance network so that the dc input current flows smoothly during the whole switching period unlike the traditional Z-source inverter...
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