<p>The number of wind turbines in the power system is increasing, and it is practical and significant to study the power flow calculation including wind farm nodes. Based on the full characteristic of power systems which include the static P-f and Q–V characteristics of generators and loads, as well as the power angle characteristics of generators, this paper establishes the mathematical model of asynchronous wind turbines considering the system frequency, and proposes a kind of secondary power flow calculation method including secondary frequency regulation method, secondary voltage regulation method, the determination method of reactive power compensation point and the layout scheme of asynchronous wind turbine. The established model is applied to the primary and secondary power flow calculation considering the frequency of synchronous generator, and is compared and verified with the conventional power flow algorithm of the power systems including wind turbines. The results show that the full-characteristic power flow algorithm is more in line with engineering practice and more suitable for engineering applications.</p>