Nowadays, improving the reliability of the PV inverters is getting increased interest, since it is closely related to the cost and efficiency of the entire system. In the PV inverter, power semiconductor switches are the core components, which realize the transformation of electrical form and determines the flow direction of the system energy. However, the power semiconductor switch is one of the most fragile components due to the limitations of the material and the manufacturing process. Statistics indicate that about 34% of the power converter system’s failures are caused by the power device and soldering failures [1]. Therefore, it is important to develop the fault-tolerant control technology to improve system reliability.