Research On The Optimal Scheduling Of CCHP Microgrid Oriented To Large Industrial Park

Industrial park as a high energy consumption region in modern city,considering the planning and construction of combined cooling,heating and power microgrid(CCHP-MG),Which is based on CCHP technology and the technology of Microgrid integrated with new energy sources,is an effective way to advance the refind,intensive and sustainable mangement of energy utilization in industrial park.The reasonable scheduling method for CCHP-MG is the guarantee to realize safe,reliable and economical operation of CCHP-MG.In this paper,optimal scheduling of CCHP-MG oriented to large industrial park is studied.The main work is shown as follow:(1)To lay the fundation for proposing the optimal scheduling method and strategy of CCHP-MG,the electric structure of CCHP-MG is constructed,and the typical energy supply devices in CCHP-MG are elaborated with their energy models.On the basis of analyzing energy flow among CCHP-MG,a energy exchange hub structure is used to describe the energy balance equation of CCHP-MG(2)Aiming at the economic operation of CCHP-MG,a mult-time scale coordinated optimal scheduling method for grid-connected CCHP-MG is proposed.For stable cold and heat load,making the day-ahead Scheduling scheme of cooling and heating through establishing the day-ahead economic dispatch model,and improved particle swarm optimization algorithm is applied to solve the model.For fluctuating electric load,making the ultra short term scheduling scheme of power.According to whether the electricity can be sold,two kinds of heuristic real-time scheduling strategy are formulated,which are defining the regulation rules of the storage battery and the operating rules of MG,and the real-time scheduling scheme of power is determined accoding to the real time data.Base on the coordination optimization of two scheduling stages with different time scales,scheduling scheme for grid-connected CCHP-MG is determined.(3)Aiming at the optimized islanding operation of CCHP-MQ a layered real-time coordinated optimal scheduling method for islanding CCHP-MG is proposed.Taking priority to meet the load demand of power as the superior scheduling layer,the islanding scheduling strategy for wind/photovoltaic/battery generation system is formulated,and the real-time scheduling scheme of power is determined accoding to the net load power,the status of battery and the power adjustment limit of gas engine during the scheduling period.Taking maximum to meet the load demand of cooling and heating as the subordinate scheduling layer,two kinds of islanding scheduling strategy for CCHP system are formulated according to the cooling and heating period,and the real-time scheduling scheme of cooling and heating is determined accoding to the load demand of cooling and heating,the status of storage device and the residual adjustable power during the scheduling period.Base on the coordination optimization of two scheduling layers with different priority,scheduling scheme for islanding CCHP-MG is determined.(4)Taking an industrial park in a northern ecological city as simulation example for optimal scheduling of CCHP-MG,the simulation results show:the proposed scheduling method for grid-connected CCHP-MG can not only reduce the cost of energy supply in the park,but also promote in the "cut peak and fill valley"to outer grid;the proposed scheduling method for for islanding CCHP-MG can not only can guarantee the supply of important power load to the best extent possible,but also maximumly meet the load demand of cooling and heating in the park.