Coordinated secondary voltage control method considering reactive power regulating capability of wind farm

The invention relates to a coordinated secondary voltage control method considering the reactive power regulating capability of a wind farm, and belongs to the technical field of automatic voltage control in an electric power system. The coordinated secondary voltage control method comprises the following steps: firstly, collecting grid operating state data within a control area; secondly, judging whether voltage levels between a generator and each of wind farm nodes within the area are qualified or not, and if an unqualified voltage level exists, regulating a reactive power compensating device under the wind farm node with the unqualified voltage and considering the reactive power regulating capability of the wind farm for coordinated and optimal calculation; finally, according to a calculated reactive power distributing value, judging the balance degree of reactive distributions of all the generators including the wind farm, and if the reactive distributions do not accord with a calculation result of coordinate optimization, entering an inner control system of the wind farm for regulation by taking an optimization calculation result as a regulating command and after the wind farm side receives the voltage level regulating command, issuing a control command by the control system in the wind farm and uploading the reactive regulating amount. By adopting the coordinated secondary voltage control method, the stability and economy of the wind farm running can be improved.