Calculation method for energy flow decoupling analysis of distributed cogeneration integrated energy system

Abstract

A method for decoupling analysis and calculation of energy flow in a distributed combined cooling, heating and power integrated energy system, including cooling / heating / grid and auxiliary electrical equipment, distributed power sources for combined cooling, heating and power, and independent electric cooling / heating equipment. Know the voltage amplitude and phase angle of the connection point between the integrated energy network and the external power grid, the power load power of each node of the power supply network except for the electric cooling / heating equipment and the auxiliary electrical equipment of the cooling / heating network, and the power generation of each distributed power supply Power, the supply / return temperature of the node where the distributed power supply in the cooling / heating network is located, the total power of the cooling / heating load required by each node of the cooling / heating network, and the cooling / heating / grid network Characteristic parameters, solve the voltage and line power of each node of the power supply network in the integrated energy system, the cooling / heating power of each node of the cooling / heating network and the power consumption of auxiliary electrical equipment. The energy flow analysis and calculation method of the present invention is more in line with the requirements of actual application scenarios, and the algorithm is simple and easy to understand, and the solution speed is fast.

Description

technical field [0001] The invention relates to the field of integrated energy system of combined cooling, heating and power, in particular to a method for decoupling analysis and calculation of energy flow of a distributed combined cooling, heating and power integrated energy system. Background technique [0002] Cogeneration gas turbines, fuel cells and other distributed power sources, combined with heat pump air conditioners, absorption refrigeration equipment, heat exchangers and other waste heat utilization refrigeration / heating devices, the active microgrid including wind-light-storage is gradually moving towards distributed cooling and heating power Joint supply integrated energy system development direction. The integrated energy system can not only provide electricity, but also meet the local cooling / heating load demand. The cascade utilization of energy realizes the efficient conversion and utilization of primary energy, improves the reliability of the energy syste...

AI Technical Summary

Problems solved by technology

The problems of the existing solution methods mainly include: (1) whether it is a joint solution or an iterative solution, the algorithm is very complicated, the convergence is poor, and the solution speed is slow; (2) when the grid load is large and the lines between nodes are short, the Newton- Raphson’s method may not be able to solve it; (3) Traditional large-scale thermal systems usually adopt the mode of “heating to determine power”, and the solution method of its mathematical model is not suitable for integrated energy systems, because the distributed power generation of combined cooling, heating and power and Conventional thermal power units are quite different, especially fuel cells; (4) The coupling relationship between the distributed power supply and independent electric cooling / heating equipment (such as: air conditioners, water heaters) and distributed cooling are not considered. / thermal application scenarios

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