Optimal Economic Dispatch Of Active Distribution Power System With Combined Cooling,Heating And Power-based Microgrids

The combined cooling heating and power(CCHP)system has received extensive attention at home and abroad with up to 90% of primary energy utilization.Under the background of declining fossil energy and increasingly serious environmental pollution problems,the application of CCHP microgrid is significant for energy integration and energy crisis resolution.In order to reduce the economic operation cost of CCHP microgrids system,this paper discusses how to optimize output power of equipment in microgrids and output power of the active distribution network.The main work of the article is as follows:(1)Introduce the energy supply structure diagram of a typical CCHP microgrid,and analyze the transmission direction and path of cooling energy,thermal energy and power energy in CCHP microgrid.Typical equipment in CCHP microgrid,distributed power equipment as gas turbine,photovoltaic power and wind power,auxiliary energy supply equipment as absorption chiller,electric chiller,gas boiler,heat exchanger and waste heat boiler,energy storage equipment as battery are mathematical modeled.(2)A centralized optimization scheduling model for active distribution power system with CCHP microgrids is proposed.The active distribution system with CCHP microgrids is divided into local scheduling layer and regional scheduling layer.The local scheduling layer is composed of wind power generation and energy storage devices.Taking the active distribution network and the CCHP microgrids system as a main body of interest in regional scheduling layer,the optimization model with the optimal total operation cost is studied,and the Cplex is used to solve the problem,so as to achieve the optimal operation cost,the optimal output of each equipment and the energy balance in each microgrid.(3)A distributed optimal scheduling model for active distribution power system with CCHP-based microgrids is proposed.The active distribution network and the CCHP microgrids system are used as two stakeholders,and the distributed optimization algorithm is used to equivalent the power interaction value between each microgrid and the active distribution network to virtual power and virtual load,to achieve decoupling solution.Test in the third chapter is used to verify that the distributed optimal scheduling model can achieve common optimal cost of the CCHP microgrids and the active distribution network.(4)A distributed optimal scheduling model for active distribution power system with CCHP-based microgrids considering the power interaction between microgrids is proposed.Considering the power interaction between microgrids in the economic operation cost of the CCHP microgrids system,setting the electricity price between the grid and the microgrid,setting the electricity price between one microgrid and the other microgrid.And the operation cost of active distribution network and CCHP microgrids considering interaction power as two optimization target,the target cascade method is used to solve the distributed optimal scheduling model.Compared with the distributed optimized scheduling of the fourth chapter,and the electricity price between CCHP microgrids is further studied.