热负荷参与调节的风-电-热电厂双阶段优化调度

Two-stage Optimal Dispatching for Wind Power-electric Boiler-thermal Power Plant with the Regulation of Thermal Load

供热机组的电出力受到供热负荷的限制,无法根据实时电价调节其最优出力。考虑到人体对温度的适应能力,室内温度允许在一定范围内变化,提出了供热负荷作为可调节负荷,应用于参与电力市场竞争的热电厂的优化调度,建立了热负荷参与调节的日前-实时双阶段优化调度方法。将风电场、电锅炉以及热电厂组合成风-电-热组合电厂,在日前调度中通过合理调整风电供热比例,向上级电网提交日前最优申报出力;在实时调度中充分利用可调节的热负荷,使组合电厂在实时辅助平衡市场中获得最大收益。仿真结果表明,热负荷参与调节的风-电-热电厂双阶段优化调度方法可以增加风-电-热电厂的实际收益,降低煤耗和碳排放,有效提高能源的利用率、缓解温室效应及供暖季雾霾情况的出现,具有显著的经济及社会价值。

The electric output of a heating unit is limited by heating load,thus its optimal output cannot be adjusted according to the real-time electricity price.In consideration of the capability of human body to adapt to temperature,indoor temperature is allowed to change in a certain range.In this paper,heating load is suggested as an adjustable load and applied to the optimal dispatching for a thermal power plant competing in the electric power market.Then,a dayahead real-time two-stage optimal dispatching method,which takes the regulation of thermal load into account,is established.The wind power station,electric boilers,and the thermal power plant are combined to form a wind power-elec.tric boiler-thermal power plant:by reasonably adjusting the wind/electricity heat supply ratio in the day-ahead regulation,the optimal day-ahead declared output will be submitted to upper-level power grid;by making full use of the adjustable thermal load in the real-time dispatching,the largest benefits in the auxiliary balance market can be obtained for the combined power plant.Simulation results show that the proposed dispatching method can increase the actual benefits of the wind power-electric boiler-thermal power plant and reduce coal consumption as well as carbon emission;it can effectively improve the utilization rate of energy,mitigate the greenhouse effect,and reduce the occurrence of smog during the heating season,which has significant economic and social values.