Optimal operation method of multi-energy flow system considering transient heat transfer characteristics of district heating network

Abstract

The invention discloses a multi-energy flow system optimization operation method considering the transient heat transfer characteristics of a regional heat network. The method includes the following steps that: step 1) a regional heat network transient heat transfer characteristic model considering a water return pipe network topological structure, a pipe section temperature change dynamic processand a pipe section transmission delay is established based on a graph theory, wherein the model mainly comprises six aspects, namely, a heat source characteristic a heat load characteristic, node flow balance, a node power fusion characteristic, a pipe section heat transfer characteristic and a pipe section transient / steady heat transfer characteristic; and step 2) a multi-energy flow system operation optimization model is established, with the lowest total operating cost of a system in the next 4 hours adopted as an objective function, on the basis of operational constraints that the systemshould meet, the real-time output of each device in the multi-energy flow system, the real-time supply and return water temperature of each heat source of the heat network, and the like, are realized,and the scheduling and optimized operation of the system can be realized. According to the method of the invention, the transient heat transfer characteristics of the regional heat network are considered, so that the optimal operating state of the multi-energy flow system is more consistent with the actual operating state of the system.

Description

technical field [0001] The invention relates to a multi-energy flow system optimization operation method, and specifically belongs to the technical field of energy system operation optimization. Background technique [0002] With the increasing world energy crisis and environmental pollution, innovative ideas such as energy Internet, integrated energy system, and "Internet +" smart energy are emerging. It is of great significance to transform the energy supply mode and build a clean and efficient modern energy system. Relying on the continuous innovation of energy transmission technology, energy conversion equipment and renewable energy and other related technologies, the multi-energy flow system couples multiple energy networks such as power grids, heating networks and natural gas networks, which is conducive to the realization of multi-energy coordinated supply and comprehensive energy cascade utilization. It has gradually become one of the important development trends in ...

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Problems solved by technology

Some scholars only focus on the heat transfer characteristics of the heat network, and use methods such as numerical simulation and experimental modeling. Although they can obtain high-precision thermal data, the models used are relatively complex, and the solution takes a long time. The water supply temperature of the heat source is difficult to apply to the ultra-short-term scheduling of the multi-energy flow system

Some scholars have made a lot of simplifications to the heat transfer characteristics and network constraints of the heat network for the steady-state heat transfer problem. Although the heat network model is easy to solve, when the system scheduling period is equivalent to the heat network delay, it will lead to significant error

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