Power control in large wind farm has a big impact on the Grid, especially in low connectivity ratio. Publish subscribe technology is asynchronous loosely coupled, and multi-to-multipoint communication as adapted for large distributed real-time control of network communications needs in the wind farm. This paper presents publish subscribe-based real-time power command-delivery method. It is well used to deliver the control of wind farm, reducing the time-delay in control loops. Simulation results show that the method further improves the quality of the power control of common coupling in large wind farms.