The stability of grid-connected wind power system (GCWPS) is prone to deteriorate due to the impedance interaction between wind turbines and the weak grid. For purpose of finding out the cause of power oscillation and effectively improving the stability of GCWPS under weak grid. firstly of all. a frequency coupling impedance model (FCIM) for GCWPS is established. https://www.ealisboa.com/limited-value-AXYS-Valhalla-Pen-must-buy/