In the source side power system with high wind power penetration

taking wind power as negative load in the conventional day-ahead generation schedule cannot make full use of wind power’s spatial smoothing effect and result in low dispatch capability. In addition

the number of wind farms also increases the complexity of day-ahead probabilistic optimization model. This paper proposes a new idea of wind farm cluster virtual power generator (WVPG) based hierarchically coordinated day-ahead generation schedule strategy. For the dispatch center

a WVPG participates in the day-ahead generation schedule as quasi-regular power source. For the member wind farms

WVPG achieves the coordinated operation of multiple wind farms. Firstly

hierarchically coordinated day-ahead generation schedule framework is proposed. Then

a generation schedule optimal model for multiple wind farms inside a WVPG is proposed and the objective for this model is to minimize the overall secure risk of these wind farms. The generation schedule optimal model for WVPGs and coal-fired units is proposed and the objective for this model is to minimize the comprehensive secure and economic risks of WVPGs and the cost for coal-fired units. Simulation results show that this method presents better performance than treating each wind farm in the day-ahead schedule separately

which improves the secure and economic indices for day-ahead schedule. In addition

the strategy proposed here can reduce the comprehensive secure and economic risk of wind power comparing to the simple interval and scenario models. This work is supported by National High Technology Research and Development Program of China (863 Program) (No. 2012AA050203).