The major drawback of the two switch flyback topology is its low-power applications such as microinverter. This study proposes a high-power two-switch flyback inverter and shows its excellent performance as a string-type PV inverter. The suggested inverter system is based on interleaving technique and operated in discontinuous conduction mode. Moreover, a fast and robust maximum power point tracking method is proposed. The fast dynamics and robustness of the proposed method is achieved using variable structure control approach. Simulation results with a 2 kW inverter system confirm the excellent performance of the suggested scheme. The total harmonic distortion and power factor are measured as 2% and 0.99 respectively. Therefore, it is shown that the performance of the suggested system is comparable to the common isolated PV inverters available in the market.

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