Control system for improving weak power grid adaptability of grid-connected inverter

The utility model discloses a control system for improving weak power grid adaptability of a grid-connected inverter, and belongs to the field of grid-connected inverter control. The method relates to a control system composed of a main control loop adopting a novel current controller and a common coupling point voltage feed-forward branch. Firstly, a reference current passes through a first proportional controller, a second proportional controller and a delay module, and outputs of the first proportional controller and the delay module are added through a first adder to obtain a first output signal; meanwhile, the common coupling point voltage is sampled, and a second output signal is generated through a virtual capacitance link and a repeated prediction link. The first output signal and the second output signal are added through the adder and then divided by the gain coefficient of the inverter bridge to obtain a modulated wave. And the modulated wave passes through the PWM module to generate a driving sign