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

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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Problems solved by technology

[0006] However, the existing vulnerable line identification research methods only consider the scenario where the power system operates independently, and do not consider the impact of other energy networks that are tightly coupled with the grid.

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