A method for handling a fault of a cascaded H-bridge inverter, comprising: in the cascaded H-bridge inverter connected to N solar panels and comprising N capacitors, N H-bridge modules, N switching devices and a controller, with N being a positive integer, detecting, by the controller, an output voltage or an output power of each of the N solar panels; determining, by the controller, whether the output voltage of at least one of the N solar panels is lower than a preset voltage, or whether the output power of at least one of the N solar panels is lower than a preset power; controlling a corresponding one of the N switching devices to be switched off and changing a set value of a voltage across a corresponding one of the N capacitors in the direct current side by the controller, in a case that the output voltage of at least one of the N solar panels is lower than the preset voltage, or that the output power of at least one of the N solar panels is lower than the preset power; and controlling, by the controller, a corresponding one of the N H-bridge modules to perform inverting by taking the set value of the voltage across the capacitor in the direct current side as an input value, so that a total output modulation voltage of the cascaded H-bridge inverter meets a preset condition; wherein the process of the controlling the corresponding switching device to be switched off and changing the set value of the voltage across the corresponding capacitor in the direct current side by the controller comprises: controlling, by the controller, the corresponding switching device to be switched off; and controlling, by the controller, the set value of the voltage across the corresponding capacitor in the direct current side to be raised, wherein the set value is raised to a value calculated based on the total output modulation voltage, which is needed by the cascaded H-bridge inverter to meet the preset condition, and wherein each H-bridge module corresponding to a switching device that is still switched on performs inverting based on a Maximum Power Point Tracking, MPPT, control strategy. in the cascaded H-bridge inverter connected to N solar panels and comprising N capacitors, N H-bridge modules, N switching devices and a controller, with N being a positive integer, detecting, by the controller, an output voltage or an output power of each of the N solar panels; determining, by the controller, whether the output voltage of at least one of the N solar panels is lower than a preset voltage, or whether the output power of at least one of the N solar panels is lower than a preset power; controlling a corresponding one of the N switching devices to be switched off and changing a set value of a voltage across a corresponding one of the N capacitors in the direct current side by the controller, in a case that the output voltage of at least one of the N solar panels is lower than the preset voltage, or that the output power of at least one of the N solar panels is lower than the preset power; and controlling, by the controller, a corresponding one of the N H-bridge modules to perform inverting by taking the set value of the voltage across the capacitor in the direct current side as an input value, so that a total output modulation voltage of the cascaded H-bridge inverter meets a preset condition; wherein the process of the controlling the corresponding switching device to be switched off and changing the set value of the voltage across the corresponding capacitor in the direct current side by the controller comprises: controlling, by the controller, the corresponding switching device to be switched off; and controlling, by the controller, the set value of the voltage across the corresponding capacitor in the direct current side to be raised, wherein the set value is raised to a value calculated based on the total output modulation voltage, which is needed by the cascaded H-bridge inverter to meet the preset condition, and wherein each H-bridge module corresponding to a switching device that is still switched on performs inverting based on a Maximum Power Point Tracking, MPPT, control strategy. controlling, by the controller, the corresponding switching device to be switched off; and controlling, by the controller, the set value of the voltage across the corresponding capacitor in the direct current side to be raised, wherein the set value is raised to a value calculated based on the total output modulation voltage, which is needed by the cascaded H-bridge inverter to meet the preset condition, and wherein each H-bridge module corresponding to a switching device that is still switched on performs inverting based on a Maximum Power Point Tracking, MPPT, control strategy.