Low-voltage ride-through method of high-power photovoltaic inverter

The invention discloses a low-voltage ride-through method of a high-power photovoltaic inverter. The low-voltage ride-through method of the high-power photovoltaic inverter comprises the steps that the drop type and depth of the voltage of a power grid are detected in real time, reactive current support meeting requirements is provided for the dropped power grid, and after drop is finished, rapid recovery of active power of a system is achieved through an open loop adjustment method and a maximum power tracing method based on control over direct current bus voltage of the system. The low-voltage ride-through method of the high-power photovoltaic inverter can rapidly and accurately respond to balanced or unbalanced drop and can meet the technical requirements of low-voltage ride-through standards.