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A steady-state modeling method of a natural gas transmission system considering pipe network delay characteristics

A technology of a gas transmission system and a modeling method, which is applied in the field of steady state modeling of a natural gas transmission system considering the delay characteristics of a pipeline network, can solve problems such as slow adjustment, large network inertia, complex models, etc., and achieves high accuracy, Calculating the effect of difficulty reduction

Pending Publication Date: 2019-04-30
TIANJIN UNIV
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  • Description
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  • Application Information

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Problems solved by technology

As the carrier of natural gas transmission between regions, the natural gas transmission network has the characteristics of large network inertia and slow adjustment on the time scale
As for the research on the transient level, most studies consider the impact of the dynamic characteristics on the transient level. Although more accurate natural gas data can be obtained, the model constructed is relatively complex, and the optimization of the intraday time scale For problems such as scheduling, it takes a long time to solve

Method used

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  • A steady-state modeling method of a natural gas transmission system considering pipe network delay characteristics
  • A steady-state modeling method of a natural gas transmission system considering pipe network delay characteristics
  • A steady-state modeling method of a natural gas transmission system considering pipe network delay characteristics

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Embodiment 1

[0048] In order to lay the foundation for the fluid system model for the steady-state analysis of the electricity-gas integrated energy system considering the delay characteristics of the natural gas transmission network, the embodiment of the present invention provides a steady-state modeling method for the natural gas transmission system considering the delay characteristics of the pipeline network , see Figure 1-Figure 3 , see the description below:

[0049] 101: According to the delay characteristics of fluid transmission, a calculation formula for the transmission delay time of the gas transmission network is proposed;

[0050] 102: According to the delay characteristics of natural gas transmission, a steady-state model of the natural gas system considering the delay characteristics of the pipeline network is established, and the virtual component "delay energy deviation device" with plug-and-play characteristics is constructed to quantify the impact of delay on gas tran...

Embodiment 2

[0054] Combine below Figure 1-Figure 3 , calculation formula, and example are further introduced to the scheme in embodiment 1, see the following description for details:

[0055] 201: Analyze the transmission delay characteristics of the natural gas transmission network, and propose a calculation method for the delay time;

[0056] In the transmission of natural gas pipeline network, due to the slow nature of natural gas and the influence of the length of the pipeline, there is usually a delay of several minutes to several hours. Assuming that the change of flow is linear, through linearization analysis, analogous to the schematic diagram of the transmission delay of the heating network, The delay model of natural gas transmission network is drawn as figure 1 shown.

[0057] The flow at the beginning and end of a section of gas pipeline is bound to be different. In the process of intraday scheduling, the time interval between the i-th scheduling time and the i+1-th schedu...

Embodiment 3

[0095] The feasibility of the optimization method provided by the embodiment of the present invention is verified by specific experiments below, see the following description for details:

[0096] Taking the 22-node pipeline network for gas transmission in the document "Natural Gas-Electricity Hybrid System Analysis and Research Method" (Zhang Yibin. Research on Natural Gas-Electricity Hybrid System Analysis Method [D]. China Electric Power Academy) as an example, the results are as follows Figure 4 As shown, the effectiveness of this method is verified and the characteristics of the model are analyzed and studied. Figure 4 The middle node 1 is the gas source point, the pressure is constant at 39.21bar, there are compressors at nodes 5, 13, and 16, and nodes 23, 24, and 25 are compressor outlet nodes, and the outlet pressure of the compressor is assumed to be constant at 39.21bar, and the outlet nodes It can be regarded as a gas source of the pipe network. The scheduling inte...

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Abstract

The invention discloses a steady-state modeling method of a natural gas transmission system considering a pipe network delay characteristic, which comprises the following steps of: a calculation method of a transmission delay time length of a gas transmission network according to a fluid transmission delay characteristic is proposed; according to the natural gas transmission delay characteristic,a natural gas system steady-state model considering the pipe network delay characteristic is established, and the influence effect of delay on a gas transmission pipe network is quantitatively explained by constructing a virtual element delay energy deviation device with the plug-and-play characteristic, including pipe network pressure distribution and official network management deviation; according to a natural gas system steady-state model considering pipe network delay characteristics, a natural gas transmission network energy flow steady-state solving algorithm considering pipe network attenuation delay is provided; the modeling work of the integrated energy system containing the long-distance gas transmission network is facilitated, the constructed delay energy deviator can serve asan independent assembly to be added into a model base of the integrated energy system, and technical support is provided for research on collaborative planning, optimized dispatching, safety analysisand the like of the integrated energy system.

Description

technical field [0001] The invention relates to the field of natural gas transmission systems and the field of comprehensive energy systems, in particular to a steady-state modeling method for natural gas transmission systems considering the delay characteristics of pipeline networks. Background technique [0002] Integrated energy system (integrated energy system, IES) is the concrete embodiment of advanced concepts such as "Internet +" at the energy physical level. It has become one of the main development trends of future energy utilization patterns. Among them, natural gas, as an important primary energy source, is most closely related to the power system. On the one hand, the dynamic characteristics of the natural gas system have brought uncertainty to the steady-state operation of the power system; In the cross-regional integrated energy system, long-distance transmission makes the fluid system have significant time delay characteristics. This has had a major impact...

Claims

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Application Information

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IPC IPC(8): G06F17/50G06Q50/06
CPCG06Q50/06G06F30/20
Inventor 王丹刘柳雷杨
Owner TIANJIN UNIV
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