Abstract: In view of the uncertainty of wind power output, based on quasi-Monte Carlo （QMC） simulation method, this paper uses the scenario analysis method to generate initial scenario of wind power output, and selects the extreme scenario including larger wind power prediction error to achieve the reduction of scenario. With different wind power output scenarios, taking into account the bilateral coordination of generation side and demand side with flexible load, this paper proposes the security constrained unit commitment model with flexible load, which can schedule three types of flexible load including curtailable load, shiftable load and transferable load. Through the simulation of different scenarios of 10 units, the influence of the demand side flexible load dispatch on the economic cost, the load peak valley difference and the exhaust air volume are analyzed and compared. Considering the uncertainty of wind power, the demand side of the flexible load scheduling plays an important role in improving the economy of the system and alleviating the peak load, and is beneficial to increase the consumption of wind power and reduce the abandoned wind power.

Key words: wind power, uncertainty, flexible load, unit commitment, quasi-Monte Carlo （QMC） simulation