Power grid configuration control method and apparatus for flexible direct current power transmission system, and medium

A device for controlling grid configuration of a flexible direct current electric power transmission system, comprising:

• a power reference value setting module configured to modify an active power reference value based on a frequency deviation of an alternating current grid, and modify a reactive power reference value based on a voltage deviation of the alternating current grid;
• a power control module configured to:
• control an outputted active power by using a pre-established frequency regulation motion equation of a virtual synchronous machine based on the active power reference value and configure a phase angle;
• and control an outputted reactive power by using a pre-established voltage regulation motion equation of the virtual synchronous machine based on the reactive power reference value and configure a grid voltage amplitude;
• and
• a voltage-current control module configured to perform PI control on an actual grid voltage based on the grid voltage amplitude and the phase angle and acquire a three-phase voltage reference value through inner-loop control;
• wherein the power reference value setting module is further configured to modify the active power reference value based on the frequency deviation of the alternating current grid by:
• determining an active power setting value as the active power reference value when it is detected that the frequency deviation of the alternating current grid is less than a preset frequency deviation threshold;
• and
• adding a deviation value of active power that changes with a frequency of the alternating current grid to the active power setting value and determining the obtained sum as the active power reference value when it is detected that the frequency deviation of the alternating current grid is greater than the preset frequency deviation threshold.