Maximum Boost Space Vector Modulated Three-Phase Three-Level Neutral-Point-Clamped Quasi-Z-Source Inverter

Z-source inverter is a power electronic converter with potential applications in areas like renewable energy, electric vehicles, etc. because unlike traditional inverters, it can provide a boost in output voltage without any additional DC-DC boost converter stage in between the DC source and inverter. This feature is particularly useful if the input DC source is of low voltage like battery or of fluctuating nature as in case of PV panels. The elimination of need for DC-DC converter stage in an inverter system increases the overall reliability of the system and also increases the overall efficiency by the elimination of DC-DC converter stage losses. In this paper, a maximum boost space vector modulation strategy which gives maximum gain for three-phase three-level quasi-Z-source inverter (QZSI) is proposed. The proposed algorithm has been verified by both simulation and experimental results.