热特性对含储热电–热联供系统的综合调度影响

Influence of Thermal Characteristics on the Synthetic Scheduling of an Integrated Heat and Power Supply System With Heat Storage

储热装置的热特性分析是实现电?热联供系统中电、热综合调度的关键之一。针对含储热的电?热联供系统,应用能量流法构建包含储热、传热和漏热过程在内的系统整体能量流模型,获得系统中电能、热能的整体传输约束。并且,以最小化系统总运行成本为优化目标,分析储热装置热特性对运行成本和风电消纳的影响。结果表明:增强储热性能(储热介质最高温度或装置总体积)、传热性能(循环水最大质量流量、换热器面积)和隔热性能(隔热材料厚度),均可不同程度地促进风电消纳,降低总运行成本。其中,增加储热介质的温度上限和传热装置的总体积可使循环水的平均质量流量分别降低15.3%和17.4%,并且存在最佳的换热器面积和循环水流量上限使得总运行成本最低,可为制定含储热电?热联供系统的综合调度方案提供依据。

Analysis of the influence of thermal characteristics on the integrated heat and power supply system is significant for the systematic scheduling and improving the wind power accommodation.This paper first established the equivalent circuits of the heat storage,heat transfer and heat loss processes,respectively in the integrated heat and power supply system with a heat storage(HS)device by applying the newly proposed power flow method and obtains the overall power transport law.With the consideration of electricity transmission and heat transfer constraints simultaneously,this paper minimized the total operation cost of thermal power and CHP plants,and analyzed the influences of heat storage,transfer and loss characteristics on the total operation cost and wind energy accommodation.The results show that enhancing the heat storage capacity(enlarging the maximum temperature or the total water volume)of the HS device,heat transfer performance(the mass flow rate ceiling of the circulating water or heat exchanger area)and the insulation performance(insulation material thickness)will improve the wind power accommodation and moreover decrease the system total operation cost.Wherein,increasing the temperature ceiling and total volume will decrease the average mass flow rate of the circulating water 15.3%and 17.4%,respectively.In addition,we obtain the optimal heat conductance and mass flow rate ceiling for the minimum of the total operation cost that will provide the significant basis for the general dispatching of integrated heat and power supply system with heat storage.