Abstract
The modeling and multi-energy flow calculation of an integrated energy system (IES) are the bases of its operation and planning. This paper establishes the models of various energy sub-systems and the coupling equipment for an electricity-gas-thermal IES, and an integrated multi-energy flow calculation model of the IES is constructed. A simplified calculation method for the compressor model in a natural gas network, one which is not included in a loop and works in constant compression ratio mode, is also proposed based on the concept of model reduction. In addition, a numerical conversion method for dealing with the conflict between nominal value and per unit value in the multi-energy flow calculation of IES is described. A case study is given to verify the correctness and speed of the proposed method, and the electricity-gas-thermal coupling interaction characteristics among sub-systems are studied.
Highlights
In users or building-level systems, through the coordination of heterogenous generation units, energy storage systems and flexible loads, multiple energies can be simultaneously generated, transmitted, stored and consumed
The natural gas network contains a gas turbinedriven compressor operating at constant compression ratio, and there is no loop in the network
The balance node of the electric system is the node connected to the bulk power grid, while for the natural gas system it is the node connected to the gas source, and for the thermal system it is node 14 connected to the combined heat and power (CHP) system
Summary
In users or building-level systems, through the coordination of heterogenous generation units, energy storage systems and flexible loads, multiple energies can be simultaneously generated, transmitted, stored and consumed. With the relative maturity of each energy system model, the modeling and multi-energy flow calculation of an IES including the electricity, natural gas and thermal networks or just two of them have been widely studied. The coexistence of electricity, gas, and heat / cold energy means the energy sub-systems are closely coupled It includes a variety of equipment, and the type of models needs to be determined according to specific requirements. Proposes a simple and fast numerical conversion method to deal with the conflicts caused by the use of per unit value in power system and nominal value in thermal and natural gas systems in the process of the integrated multi-energy flow calculation. The model of the district heat system is mainly composed of a hydraulic model and a thermal model
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