In view of the structural contradiction between heating and wind power consumption of thermoelectric units during heating period, a thermal power cooperative dispatching support system is established. Based on platform layer, computing layer and collaboration layer, data acquisition and processing, unit regulation capacity calculation and cooperative scheduling are realized respectively. On the premise of ensuring the quality of data collection, according to the set of unit operation constraints, the system constructs a calculation model of peak regulation margin based on the operation feasible region of cogeneration units, and realizes the deep mining of the peak regulation capacity of generating units under certain heat supply. Through collaborative optimization of power load distribution in the region, the level of wind power consumption can be improved. The operation results of the system in Liaoning Provincial dispatching Center show that the thermoelectric units can not only meet the heating demand, but also maintain safe operation at a lower generation load level. Through collaborative optimization of load distribution, the overall peak regulation capacity of thermoelectric units has been increased by 14.8%, and the absorption capacity of clean energy has been greatly improved.