The invention discloses a DFIG and SVC reactive emergency coordination control method in a
wind power plant. The method comprises steps of setting a reference
voltage threshold value of DFIG participating in reactive power support and a reference
voltage threshold value of SVC switching operation; based on a grid-connected point
voltage, a DFIG
terminal voltage and the
Crowbar protection action information, adjusting operation states of a wind
turbine generator and the SVC; calculating the limit reactive adjustable quantity of each reactive compensation device based on multiple adjustable states; performing reactive power adjustable quantity distribution in the
wind power plant, and calculating emergency reactive power adjustable quantities of a wind
turbine generator and SVC equipment; and after that the voltage is recovered to a
normal control range is ensured, performing a conventional reactive power allocation scheme of the wind
turbine generator and the SVC equipment. The DFIG andSVC reactive emergency coordination control method in a
wind power plant is advantaged in that on the premise that a multi-direct-current weak sending
end system has an alternating-current and direct-current cascading fault, based on the basic principle of near-region wind power plant reactive power source coordination control, the dynamic reactive
response characteristics of DFIG, SVC and otherdevices in the wind power plant are fully utilized, and a problem that large-scale off-grid of a draught fan is caused by large-amplitude fluctuation of a grid-connected point voltage of a wind powerplant in the fault period is further solved.