A Method for Identification and Optimization of Vulnerable Lines in Electrical-Pneumatic Coupling System

Abstract

The invention discloses a method for identifying and optimizing vulnerable lines of an electric-pneumatic coupling system. Input the original data, establish an optimization model of the electric-pneumatic coupling system, and process to obtain the initial operating state of the coupling system; respectively turn off the output power of each gas source in the natural gas network, calculate the vulnerability of the gas source and perform weight processing to obtain the line coupling vulnerability factor; extract the power The network topology structure processing obtains the line topology vulnerability factor; disconnects each power grid line separately, obtains the power flow distribution entropy, and thus obtains the line operation vulnerability factor; comprehensively obtains the comprehensive vulnerability of the line, and sorts it in order from large to small, greater than The line with the set threshold is the fragile line; after the vulnerable line is identified, the transmission capacity of the vulnerable line can be increased by thickening the wire. The invention can quickly identify the fragile lines in the electric-pneumatic coupling system, strengthen the monitoring and protection of the fragile lines, and can effectively prevent the probability of large-scale power outages in the power system.

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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