Volatility and instability of wind power increases the difficult of power grid dispatching

for the economyand reliability

the paper raise variable confidence chance-constrained model to the spinning reserve constraint.First

the paper establishes economy and reliability objective functions

introducing confidence β to reliability objec-tive function

that confidence equal to spinning reserve chance-constrained. Second

using the membership functioncombined two objective functions into the one. Third

using the improved PSO based on LDIW solve each time theoptimal degree of confidence β and optimal output and the optimal spinning reserve capacity of each unit. Finally

IEEE-RTS96 system is used in the simulation. The results prove that the proposed method is both superior to conven-tional dispatching result with chance-constrained method and the conventional method of wind power optimizationscheduling

both to ensure the economy and the reliability of the system

the improved particle swarm LDIW methodhas accelerated the speed of operation of the algorithm to ensure the validity of the model and algorithm.