Chinas wind power industry has developed rapidly these years.Because of the limited peak demand regulation capability of the power systems in Northeast，North and Northwest China，the curtailment of wind power has been serious.If we only consider the prediction of wind power，the existing annual wind power plan differs from the real situation after wind curtailment and as such it is difficult to do wind power planning.Considering wind power output characteristics，load characteristics，transmission capacity and some other factors，an annual wind power planning method based on time sequential simulation is proposed.The method can optimize the power balance with wind power at each time period of a year.An optimization model is built for analyzing the wind power plan of provincial power grid.Based on an actual provincial power grid，capabilities in wind power balancing，energy-saving，and emission reduction between time sequence simulation method and typical day analysis method are studied.The impacts of different generating schedules on the wind power balance ability are also included.Case study results show that the model of a3-day rolling optimization is appropriate for the actual grid dispatching with high computational efficiency.Moreover，the wind power accommodation ability can be improved by using this model to provide a reference for annual planning.