Maximum power tracking method based on direct-current bus voltage control

The invention discloses a maximum power tracking method based on direct-current bus voltage control. The method includes the steps that a direct-current bus voltage Udc and input direct-current Idc of an inverter are detected in real time, and real-time input power Pdc is obtained through calculation; a given value Udc_ref of the direct-current bus voltage Udc is disturbed, and the differential value between the Udc and the Udc_ref is adjusted through a PI adjustor and then serves as a set input value Iref (t) of inverter current control; the inverter performs PI adjustment on output currents according to the set input value Iref (t), so that an output active current value Id is equal to Iref (t); change conditions of the input power Pdc of the inverter are calculated after the disturbance, so that a corresponding direct-current bus voltage value when the input power of the inverter is maximum is obtained. The maximum power tracking method is used for tracking the maximum power of the high-power photovoltaic inverter, under the condition that the input curvature of a PV array is changed, a new maximum power point can be found more rapidly and accurately through the inverter, and efficient and stable output is kept.