Energy storage battery state determination method and device based on wind storage combined system

The invention discloses an energy storage battery state determination method and device based on a wind storage combined system, and relates to the field of wind power generation, the field of energy storage and other related technical fields. The method comprises the following steps: acquiring a wind storage second-order filtering stabilization digital simulation model; updating the wind storage second-order filtering stabilization digital simulation model through the second-order filtering time constant to obtain a target model; updating the target model by adopting a bilinear transformation method to obtain a discretized time-domain digital model; and determining the battery state of the energy storage battery according to the discretized time domain digital model. In the prior art, when a first-order low-pass filtering model is used to determine the output power of a wind power generation system, a filtering time constant is difficult to effectively determine to stabilize the fluctuation condition of each