Cascaded H bridge inverter and fault handling method thereof

The invention provides a cascaded H bridge inverter and a fault handling method thereof. The fault handing method comprises the steps that a controller detects the output voltages or output powers of N solar cell panels; when the output voltage of the certain solar cell panel is less than a preset voltage or the output power of the same is less than a preset power, the controller controls a corresponding switching device to disconnect, and changes the corresponding direct current side capacitor voltage set value; and then the controller controls the corresponding H bridge module to invert by using the direct current side capacitor voltage set value as the input value, thus the total output modulated voltage of the cascaded H bridge inverter meets a preset condition, the system cannot operate normally and stably is avoided, it ensures that the undamaged solar cell panel can deliver energy to the power grid, and the heavy loss of the generated energy is avoided.