Power Flow Analysis and Comparison of Thermoelectric Coupling Integrated Energy System Based on Energy Flow Coupling Mechanism
The thermoelectric coupling integrated energy system is of great significance for improving energy utilization efficiency and achieving sustainable development.As a commonly used method for studying steady-state thermoelectric coupling integrated energy systems,power flow calculation can calculate the energy flow distribution of the system network,providing a data foundation for subsequent planning,operation,and regulation.Based on the law of thermoelectric coupling,this article improves the traditional thermodynamic system model by considering the heat loss of return water in the thermodynamic system and combines it with the power system model to form a power flow calculation model for the thermoelectric coupling comprehensive energy system.On this basis,two power flow calculation methods-the-unified solution method and the discrete solution method,are studied.A calculation example system is established,the discrete solution method and the unified solution method are used respectively for power flow calculation,and the computational performance and results of the two are compared and analyzed.The results show that when the calculation accuracy of the example system is set to 10-2,both the unified solution method and the discrete solution method can meet the requirements of power flow calculation for thermoelectric coupling systems.The power of the power grid nodes in the system meets Kirchhoff's law.Due to the need for working fluids to carry energy,the heat supply network needs to consider the loss of working fluids in addition to pure energy loss during flow.Therefore,the total amount of return water is less than the total amount of water supply.When the system uses heat to determine electricity,the total number of iterations for the discrete solution method is 10,which takes 8.48 seconds,while for the unified solution method,the number of iterations is 8,which takes 10.56 seconds.When considering the mutual influence between the heating network and the power grid,the number of iterations and time consumed for the discrete solution method increase significantly while the unified solution method remains basically unchanged.Therefore,using the discrete solution method to determine electricity by heat is more convenient.When considering the mutual influence between the heating network and the power grid,the unified solution method is suitable.
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