A new modulation strategy of quasi-Z-source inverter in photovoltaic system

A photovoltaic system based on quasi-Z-source inverter (QZSI) is discussed. The QZSI has higher boost capacity and stability than the traditional inverters, but different modulation strategy is needed to realize these characteristics. A new space vector pulse-width amplitude modulation strategy is proposed to reduce the switching loss and the weighted total harmonic distortion of the output voltage of photovoltaic system. Its algorithm and implementation are discussed. The proposed method is validated by simulations and experiments.