基于能量流的电热综合能源系统弃风消纳优化调度模型

Optimal Dispatch Model of Wind Power Accommodation in Integrated Electrical-Thermal Power System Based on Power Flow Model

针对三北地区供热期运行调峰约束导致的弃风问题,提出了基于能量流的电热综合能源系统弃风消纳优化调度模型。首先建立与电力系统模型相容的热力系统能量流模型。以能量流法根据温度变化预测热负荷,并以该结果作为优化调度模型的已知条件。然后以煤耗量最低为目标函数,建立优化调度模型。与传统模型相比,该模型考虑了换热环节约束如换热器热阻约束等。最后通过算例验证该模型的有效性,结果表明：利用电加热站供热,可增加低谷电负荷,降低机组的热定电出力,为风电上网留出空间;用户室内温度影响热负荷大小,进而影响风电消纳总量;计及换热环节约束的优化调度模型计算出的优化调度结果更准确、可信。

Aiming at wind power curtailment mainly caused by peak shaving constraints during heating period in Northern China, an optimal dispatch model of using wind power in integrated electrical-thermal power system based on power flow model was proposed in this paper. Firstly, power flow model of thermal system was constructed, similar to power system. And then heating load was calculated according to varying temperature by means of the power flow model. This heating load was used as a boundary condition for combined heat and power（CHP） dispatch. Objective function of the dispatch model was to minimize total coal consumption. Compared with previous models, heat transfer process constraints were taken into consideration in forms of heat resistance constraints in heat exchangers. Finally, validity of this scheme was verified with case studies. Results show that heating with wind power can increase electric load in off-peak period and reduce CHP power output constrained by heat demand, and improve wind power integration. Room temperature has effects on heating load and wind power consumption. Optimized dispatching results using the proposed model with heat transfer constraints are more accurate and credible.