Research On Optimal Dispatching Of Microgrid With Cogeneration Of Cooling,Heating And Power

In the face of the development of new energy technologies and the diversification of user energy demand,the transformation of energy systems is the general trend.The integrated energy system has received extensive attention due to the cascade utilization of energy and the coordination and complementarity of multiple energy sources.At present,most researches on integrated energy systems are aimed at the research of CCHP micro-grid systems.Therefore,this paper studies the optimal scheduling of CCHP micro-grid in the park under grid-connected and islanded states.The content includes the following aspects:(1)Summarize and analyze the characteristics and structure of the cogeneration micro-grid,and combine the characteristics of various electrical equipment in the co-supply micro-grid and their mutual relationship,including photovoltaic power generation,wind power generation,storage batteries and gas.Mathematical models of generators,gas boilers,waste heat absorption cold water heaters,electric refrigerators,heat storage/cold storage,water pumps,etc.,and give their constraints.Based on this,two types of grid-connected and isolated networks are proposed.Optimized scheduling strategy in the mode.(2)For the research on the optimal scheduling of cold-heat-powered micro-grid in the grid-connected operation mode,aiming at the multi-energy micro-grid economic dispatching,a multi-energy stream collaborative optimization grid-connected operation scheduling method is proposed.A daily economic dispatching model of micro-grid with various forms of energy,such as cold,heat and power,was established.Combining the conversion efficiency of different energy forms and the constraints of various energy supply devices,the particle swarm optimization algorithm is used to solve the model,and the multi-energy flow cooperative optimization scheduling scheme is determined.The example analysis shows that the established model can optimize the energy output,significantly reduce the operating cost of the microgrid,and verify the validity and economy of the model.(3)Research on the optimal dispatching of the cogeneration micro-grid under the operation mode of the isolated network,in accordance with the method of “fixing the cooling/heating by electricity”,giving priority to ensuring the stable power supply of important electric loads,and satisfying the cold/heat loads maximum.Based on this principle,a cold/hot/electricity multi-energy coordination scheduling strategy for isolated networks is formulated.Based on this scheduling strategy,the problem of independent power supply and maximum energy utilization in the case of isolated networks is studied.In the first aspect,the charging and discharging strategies of multi-energy storage units are optimized to maximize the energy utilization of energy storage units in isolated networks.In the second aspect,considering the difference of the cooling load demand in different time periods,a minimum electric power value setting that can be scheduled by the joint supply system is proposed.method.The effectiveness of the proposed method is verified by simulation examples in each part of the research.