Y-source inverter has been proposed for a few years, but it inherits many problems from coupled-inductor impedance-source inverters (CISIs). So, many studies to address the issues of traditional Y-source inverter have been carried out. However, the reliability of a field working Y-source inverter has never been studied. In this paper, a modified topology of Y-source inverter is proposed which can solve the problem of discontinuous input current and increase boost ratio. The reliability of the proposed modified Y-source inverter (M-YSI) is studied using Physics-of-Failure approach. The lifetime of the proposed topology is predicted under a real mission profile in photo-voltaic application.
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