Energy flow decoupling analysis and calculation method for distributed combined cooling, heating and power comprehensive energy system

Abstract

The invention discloses an energy flow decoupling analysis and calculation method for a distributed combined cooling, heating and power comprehensive energy system. The system comprises a cooling / heating / power network, an auxiliary electrical device, a combined cooling, heating and power distributed power supply and an independent electric cooling / heating device. Through the known voltage amplitude and a phase angle of a connection point of a comprehensive energy network and an external power network, the power of the other power loads except the electric cooling / heating device and the auxiliary electrical device of the cooling / heating network at the nodes of a power supply network, the generating power of each distributed power supply, the supply / return temperature of the node where the combined cooling, heating and power distributed power supply is located in the cooling / heating network, the total cooling / heating load power required by each node of the cooling / heating network, and the network characteristic parameters of the cooling / heating / power network, the voltage and line power of each node of the power supply network, the cold / heat supply power of each node of the cooling / heating network and the electric power of the auxiliary electrical device in the comprehensive energy system are solved. The energy flow analysis and calculation method better meets the requirements ofactual application scenes, the algorithm is simple and easy to understand, and the solving speed is high.

Description

technical field [0001] The invention relates to the field of combined cooling, heating and power integrated energy systems, in particular to a decoupling analysis and calculation method for the energy flow of a distributed combined cooling, heating and power integrated energy system. Background technique [0002] Distributed power sources such as combined heat and power gas turbines and fuel cells, combined with heat pump air conditioners, absorption refrigeration equipment, heat exchangers and other waste heat utilization refrigeration / heating devices, and active microgrids including wind-solar-storage gradually become distributed cooling and heating power. The development direction of joint energy supply system. 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 system,...

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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