CONTROL SYSTEM FOR DIRECT CURRENT BUS VOLTAGE, AND CONTROL METHOD

A system and method for controlling a direct current bus voltage are provided. The system for controlling a direct current bus voltage includes a controller and an inverter. An output end of the inverter is connected to a power grid, and an input end of the inverter is connected to a photovoltaic module through a direct current bus. The controller is configured to: obtain a power grid voltage; obtain a maximum sampling value of a direct current bus voltage of the inverter when the power grid voltage jumps, where the maximum sampling value of the direct current bus voltage is a maximum voltage value on the direct current bus in a time period for detecting a power grid voltage jump; obtain a first direct current bus voltage reference value based on the maximum sampling value of the direct current bus voltage, where the direct current bus voltage reference value is greater than or equal to the maximum sampling value of the direct current bus voltage; and obtain a second direct current bus voltage reference value based on the first direct current bus voltage reference value and a preset first rising gradient value, to limit a rising rate of the direct current bus voltage.