Comprehensive protection method of electricity-gas coupling system under load redistribution attack

Abstract

The invention discloses a comprehensive protection method for an electricity-gas coupling system under a load redistribution attack. The method comprises the following steps: simulating a bilateral collaborative LR attack from an attacker perspective; considering the influence of the power grid cascading failure caused by the bilateral collaborative LR attack on the system load, establishing a power-gas coupling system loss evaluation model, and uniformly measuring the load loss of the power grid and the natural gas network in the power-gas coupling system by adopting economic loss; solving the power-gas coupling system loss evaluation model through a linearization method and KKT condition conversion, calculating economic loss of the power-gas coupling system caused by attack, and determining vulnerability of each load node in the system; analyzing the comprehensive vulnerability and the degree of the comprehensive vulnerability of each load node under different attack resource degrees; and the electricity-gas coupling system is comprehensively protected by strengthening protection of the load nodes with high comprehensive vulnerability and limiting the gas-to-electricity load reduction proportion. According to the method, the attack resistance of the system is improved, and the economic loss of the IEGS is reduced.

Description

technical field [0001] The invention relates to the technical field of smart grid protection, in particular to a comprehensive protection method for an electrical-pneumatic coupling system under load redistribution attacks. Background technique [0002] As the realistic carrier of the cyber physical system (CPS), the smart grid undertakes the important task of promoting the construction of a new type of power grid, and is a solid guarantee for the safe and stable operation of the power system [1]. At the same time, under the goal of accelerating the construction of a clean, low-carbon and efficient energy system, breaking down the barriers between different energy sources, and allowing the organic integration of various types of energy, natural gas power generation as a clean and efficient form of energy supply is widely used in power systems. It overcomes the shortcomings of other clean energy sources such as intermittency and volatility. In the context of deepening coupli...

AI Technical Summary

Problems solved by technology

Although the existing cyber-physical collaborative attack research provides effective support for protecting system information security, it cannot directly reflect the losses caused by information attacks on the system, and at the same time, it has not comprehensively evaluated the vulnerability of nodes in the system, so it cannot truly Reflects high vulnerability nodes within the system

In addition, coordinated attacks require high timeliness of physical attacks, so it is difficult to implement physical information coordinated attacks on power systems in practice.

[0004] The second category is single information attack, which is more common in actual power system attacks

It can be seen that most of the existing studies on the impact of information attacks on power systems do not consider the limitation of attack resources and the power flow transfer caused by attacks will overload the line, which will cause serious cascading failures and cause greater losses to the operation of the power system

Although a small number of studies have taken into account the risk of cascading failures, they have not uniformly measured the total loss caused by the attack to the power system

The above studies on LR attacks all focus on the analysis of the attack effect on the power system. There are few information attacks on IEGS, and the vulnerability nodes of the system are not analyzed, so the impact of LR attacks on IEGS cannot be clearly reflected.

[0005] At present, there are few researches on information attack on IEGS. Existing research focuses on analyzing the effect of information attack on the power system. The impact of failures on the system

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