Research On Optimal Scheduling Of Cold-thermal-gas-electric Microenergy Network

In recent years,with the continuous advancement of industrialization,China's energy consumption level has also continued to increase.Under the dual pressures of supply and demand between rapidly increasing energy demand and diminishing fossil energy and climate change,energy production and consumption patterns need to be changed,and the pursuit of efficient and clean energy use has become a new trend in energy development.The micro-energy grid is guided by the end-use energy demand and based on the development of the energy internet.It is promoted by the concept of "micro-grid" and is one of the energy internet.The micro-energy network can greatly reduce the waste of resources through the coordinated planning and unified scheduling of multiple types of energy in the network,and can realize the efficient use of energy production and consumption on the spot,and significantly improve the energy utilization rate.Based on the above background,this paper conducts research on the optimal scheduling of micro-energy network operations,the specific contents are as follows:Firstly,the research status of micro energy grid at home and abroad is summarized,and the research background and significance of this topic are expounded.Through the structure diagram of the energy hub,the internal energy flow of the micro-energy network and the operating mechanism under different operating modes are analyzed;the operating characteristics of the micro-source equipment such as wind turbines,photovoltaic,micro gas turbines and other equipment in the micro-energy network system,And established a corresponding mathematical model.Secondly,the optimal scheduling problem under the island operation of micro-energy network is researched.In order to reduce energy waste and maintain power balance in the island state,a micro-energy network model including wind,solar renewable energy,micro gas units,power to gas(P2G),and various energy storage devices was created.Based on this,the user-side electrical and thermal flexible loads are incorporated into the demand-side response resources,and the minimum operation cost of the micro-energy network is used as the objective function to build a day-to-day scheduling model of the micro-energy network in an island state,and the CPLEX solver is used to solve it.The evaluation index function is introduced from the energy side and the load side to quantitatively evaluate the scheduling results in different scenarios.The calculation examples show that the micro-energy grid system including P2G and micro gas units under demand response can achieve efficient use of energy and save Operating costs improve the reliability of power supply in isolated islands.Finally,the optimal scheduling of micro-energy grids under grid connection is studied.To improve and upgrade the traditional CHP unit,starting from the working principle of the cogeneration unit,the ORC waste heat power generation device is introduced to break the constraint of "determining electricity with heat",so that the upgraded CHP unit output thermoelectric ratio can be adjusted to match the thermal power load demand.Coordination;then build a model of translatable load,transferable load,and load reduction from the perspective of the autonomous response of the power user side,and establish a thermal flexible load model based on the thermal inertia of the heat network and the user's ambiguity of temperature perception to enhance system flexibility Regulation ability,and then constructed a grid-connected day-to-day scheduling model with the lowest operating cost as the objective function and solved it with CPLEX optimization software.The analysis with specific calculation examples shows that the combination of multiple types of flexible loads with thermocouple units and P2G equipment can effectively reduce operating costs and improve energy utilization.