Reactive power control method, device and system

A reactive power control system, comprising:

• at least one wind power generator set arranged on an aggregate line;
• a control device, connected to the at least one wind power generator set via a communication line;
• a reactive power compensation device communicatively connected to the at least one wind power generator set and the control device;
• and
• a data acquisition device, configured to acquire an electrical quantity parameter of a preset control point and connected to the control device via a communication line, wherein
• the control device comprises:
• a communication interface, configured to receive a reactive power requirement command;
• an input interface, configured to acquire an electrical quantity parameter of a preset control point;
• a strategy calculation module, configured to calculate a target reactive power value meeting the reactive power requirement command based on the electrical quantity parameter, and allocate reactive power to be provided by a regulatable reactive device based on the target reactive power value;
• and
• an output interface, configured to send a command for providing the allocated reactive power to the regulatable reactive device.

A reactive power control method, comprising:

• receiving a reactive power requirement command and acquiring a reactive power command value M1 based on the reactive power requirement command;
• acquiring an electrical quantity parameter of a preset control point and calculating a reactive power calculated value M2 of the preset control point based on the electrical quantity parameter;
• calculating a difference ΔM between the reactive power command value M1 and the reactive power calculated value M2;
• obtaining a target reactive power value based on the difference ΔM;
• comparing the difference ΔM with a preset dead band value;
• generating a reactive power allocation strategy based on the comparison result and the target reactive power value, wherein the reactive power allocation strategy is used for calculating a reactive power capability value of a regulatable reactive device in a wind power generation site and allocating reactive power to be provided by the regulatable reactive device;
• and
• sending a command, for indicating the regulatable reactive device to generate the allocated reactive power, to the regulatable reactive device, based on the reactive power allocation strategy.