Inverter and control method and control device thereof

The invention provides an inverter and a control method and a control device thereof, and relates to the technical field of electrics. The method comprises the steps of obtaining the output current, the output voltage and the DC bus voltage of the inverter; judging whether the output current is greater than or equal to an overcurrent protection threshold or not; if so, controlling the inverter to stop working; if not, further judging whether the output current is greater than or equal to a cycle-by-cycle current limiting threshold value or not; if so, controlling the inverter to work in a cycle-by-cycle current limiting mode; and if not, adjusting the duty ratio of the PWM signal input to the inverter according to the output voltage, the DC bus voltage and the output current. The working mode of the inverter is adjusted in real time according to the working parameters of the inverter, the starting current when the impact load is connected can be limited, the inverter is prevented from being shut down due to o