Method for identifying and optimizing fragile line of electric-gas coupling system

A system optimization and optimization method technology, applied in the field of integrated energy systems and power systems, can solve problems such as unconsidered impacts

Active Publication Date: 2019-08-06
ZHEJIANG UNIV
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Problems solved by technology

[0006] However, the existing vulnerable line identification research methods only consider the scenario where the power ...

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  • Method for identifying and optimizing fragile line of electric-gas coupling system
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  • Method for identifying and optimizing fragile line of electric-gas coupling system

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specific Embodiment

[0086] Taking the IEEE 30-node transmission network and the Belgian 20-node natural gas grid as examples, the specific implementation of the present invention will be described in detail in combination with technical solutions and accompanying drawings.

[0087] Such as figure 1As shown, the IEEE30 node system includes 30 nodes and 41 power lines. The generator sets on nodes 1, 8, and 13 are set as gas-fired units, and the natural gas is supplied by nodes 10, 7, and 16 in the natural gas system to generate electricity. It is a conventional unit; Belgium's 20-node natural gas network includes 20 nodes and 19 natural gas pipelines. In addition, for the convenience of calculation, the Belgian 20-node system is modified as follows: the double-circuit natural gas pipeline is merged into a single circuit; the upper limit of each natural gas source is increased. The following modifications are made to the IEEE30 node system: all lines are simplified as undirected right edges, exclud...

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Abstract

The invention discloses a method for identifying and optimizing a fragile line of an electric-gas coupling system. The method includes inputting original data, establishing an electric-gas coupling system optimization model, and processing to obtain initial operation state of coupling system; turning off the output power of each gas source of the natural gas network, calculating the gas source vulnerability, and carrying out weight processing to obtain a line coupling vulnerability factor; extracting a topological structure of the electric network and processing to obtain a line topological vulnerability factor; respectively disconnecting each power grid line to obtain a power flow distribution entropy so as to obtain a line operation vulnerability factor; comprehensively obtaining the comprehensive vulnerability of the lines, sorting according to the descending order, and the lines larger than a set threshold value are the fragile lines; and after the fragile line is identified, the transmission capacity of the fragile lines is improved through the thickened wire. According to invention, fragile line in electricity-gas coupling system can be rapidly identified, monitoring and protection of fragile line are enhanced, and probability of large-area power failure of power system can be effectively prevented.

Description

technical field [0001] The invention belongs to the technical field of electric power systems and comprehensive energy systems, and relates to a method for identifying vulnerable lines under the condition of deep coupling between a power grid and a natural gas network. Background technique [0002] At present, it has become a development trend of the energy industry to establish a new energy system that takes electric energy as the core and integrates other forms of energy such as gas and heat. With the gradual increase in the penetration rate of natural gas power generation, the operating status of the natural gas system will also have an important impact on the reliable power supply of the power system. In 2017, the "815 blackout accident" occurred in Taiwan, my country, because of the failure of the natural gas source, which led to the interruption of the gas supply of some gas-fired units, and the insufficient power supply on the power system side, which caused a major b...

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Application Information

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IPC IPC(8): G06F17/50H02J3/00
CPCH02J3/00G06F30/20
Inventor 丁一周晓鸣桑茂盛包铭磊杨阳涂腾
Owner ZHEJIANG UNIV
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