考虑电能交互的冷热电多微网系统日前优化经济调度

Day-ahead Optimized Economic Dispatch of CCHP Multi-microgrid System Considering Power Interaction Among Microgrids

多个冷热电联供型微网接入同一区域配电网,形成以配电网为核心的冷热电联供型多微网系统。当冷热电联供型多微网间通过联络线进行电能交互时,给传统的多微网系统优化调度问题带来了挑战。在分析典型冷热电联供型微网供能结构的基础上,研究供用储设备间的冷热电能流动关系和设备的数学模型,建立考虑微网间电能交互的冷热电联供型多微网系统优化经济调度模型。通过天津中新生态城算例,分析各个冷热电联供型微网中设备出力和冷热电负荷平衡情况,与多微网间不存在电能交互时的优化调度进行经济成本、CO_2排放量和各微网与电网交易电功率值的比较,与传统冷热电联供系统"以热定电"和"以电定热"运行方式下多微网系统的总运行成本进行对比,验证所提模型的经济性、环保性和有效性,并对微网间交易电价的制定做进一步研究。

As a large number of microgrids with combined cooling,heating and power（CCHP）are integrated into the same distribution network,it forms CCHP multi-microgrid system in which the distribution network is the core.When there is power interaction among multi-microgrid,it brings great challenges to the traditional optimized economic dispatch.On the basis of energy supply structure of CCHP microgrid,the cooling,heating and power energy flow among devices and equipment models are analyzed.The optimized economic dispatch model of CCHP multi-microgrid system considering the power interaction is also established.Through the example of Zhongxin district in Tianjin municipality,China,the output power of equipment and the balance of cooling,heating and power load in every CCHP microgrid are analyzed.Then it compares with economic dispatch of CCHP multi-microgrid without power interaction,about economy cost,CO2 emission and power interaction with the grid.Finally,the whole system operation cost is compared with that of the conventional CCHP system in following the thermal load（FTL）and following the electric load（FEL）operation mode,which confirms that the model proposed is effective,economic and environment-friendly.The relationship between the total cost of multi-microgrid system and electricity transaction price among microgrids is further studied.