Wind power plant grid-connection point reactive power control method and device

Abstract

The invention provides a wind power plant grid-connection point reactive power control method and device. The method is characterized by, to begin with, determining voltage deviation of a wind power plant grid-connection point; then, determining a reactive power distribution coefficient of a wind generation set; and finally, determining a reactive power reference value of the wind generation set.The voltage of the grid-connection point of the wind power plant is regulated and controlled by changing reactive power output of the wind generation set in the wind power plant and without additionally increasing a reactive power compensation device, so that automatic operation and management level of the wind power plant can be improved, and investment cost of the reactive power compensation device of the wind power plant is reduced; reactive power regulation amount of the wind power plant grid-connection point is calculated according to difference of selected control modes of the wind powerplant, thereby increasing flexibility of reactive power control of the wind power plant; and when the reactive power reference value of the wind generation set in the wind power plant is configured,equivalent reactance of each power generator set to the low-voltage side of the wind power plant booster station is considered, thereby improving regulation precision of the reactive power of the windpower plant and reducing regulation times.

Description

technical field [0001] The invention relates to the field of new energy power generation scheduling automation, in particular to a method and device for controlling reactive power at grid-connected points of wind farms. Background technique [0002] The inherent intermittent characteristics of wind power make the active output of wind farms fluctuate greatly, and the power generation power at the future moment has certain uncertainty. One of the important aspects is the problem of reactive power and voltage. Large-scale wind power grid connection will cause grid voltage fluctuations, especially the voltage fluctuations at the grid connection points of wind farms are the most prominent. In order to ensure the safe and stable operation of the power grid, the existing national standards and enterprise standards related to wind farms clearly require that wind farms must have corresponding reactive power and voltage control capabilities. [0003] At present, most wind farms have...

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Problems solved by technology

[0004] In order to overcome the disadvantages of high cost and poor flexibility of wind farm reactive power control in the prior art, the present invention provides a method and device for controlling reactive power at grid-connected points of wind farms. Firstly, the wind farm is determined according to the control mode of the wind farm and then The voltage deviation of the network point; then determine the reactive power distribution coefficient of the wind turbine according to the actual reactive power value of the wind turbine; finally determine the reactive power distribution coefficient of the wind turbine based on the voltage deviation of the grid-connected point of the wind farm and the reactive power distribution coefficient of the wind turbine Work power reference value, no need to add additional reactive power compensation device, reduces control cost, and has high flexibility

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