The invention discloses a wind energy storage system wide area optimizing configuration method, which is characterized in that the quantization ability of wind electricity admitted by a system is evaluated through comprehensive checking on voltage stability and voltage quality after wind power integration; an energy storage system is assessed for improving the wind electricity quantization admitting ability; the capacity of the energy storage system is determined according to different requirements of the admitting ability; and wide area optimizing distribution points and wide area selection points are carried out by the energy storage system based on a second order network loss sensitivity principle. With the adoption of the wind energy storage system wide area optimizing configuration method, various technical indexes are considered after the wind power integration; customization of the capacity of the energy storage system is comprehensively guided; and through the wide area configuration of the energy storage system based on the network loss sensitivity, the voltage stability of the system after the wind power integration is further enhanced, and the corresponding voltage quality is improved.