Photovoltaic inverter grid-connected control method

The invention discloses a grid-connected control method for a photovoltaic inverter. The grid-connected control method comprises the following steps of S1, collecting output current of a photovoltaic array, S2, converting the output current, S3, controlling output of an inversion module, S4, increasing voltage sampling points, S5, introducing an intelligent control algorithm, and S6, merging the output current into a power grid. According to the photovoltaic inverter grid-connected control method, current input by a photovoltaic array is collected and fed back to an MPPT controller, the current is converted into alternating current through a DC/DC converter, an alternating current electric signal is input to the MPPT controller, the converted alternating current is sent to an inversion module, and the inversion module is connected with an inverter. The MPPT controller can continuously adjust the output voltage of the photovoltaic array to generate the maximum power corresponding to the current environment, so