Provided are a wind farm, a wind farm controller, and a wind farm control method that eliminate the need for estimating an output controllable amount and can make the output of the wind farm quickly close to a predetermined output control target amount. The wind farm 7 is provided with a plurality of wind power generation systems (9a, 9b, 9c), a windmill controller 98 for controlling the outputs of the wind power generation systems, and a wind farm controller 7 for controlling the total output of the plurality of wind power generation systems. The wind farm controller 7 determines, from wind power generation system outputs Pgen_a, b, c and a wind farm output upper-limit command value PWT_ref that is the upper-limit command value of the total output of the plurality of wind power generation systems, output upper-limit command values Plim_a, b, c that are the upper-limit command values of the outputs of the respective wind power generation systems, and transmits the output upper-limit command values Plim_a, b, c to the windmill controller 98.
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