Two-layer assessment model, system and calculation method of power system network security risk
A network security and power system technology, applied in the two-tier assessment model of power system network security risk and its calculation field, can solve problems such as low calculation efficiency and insufficient convergence, achieve wide adaptability, avoid insufficient research and judgment, and complex calculations low degree of effect
Active Publication Date: 2022-04-08
HUNAN UNIV
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[0004] The technical problem to be solved by the present invention is to provide a two-layer evaluation model and calculation method for power system network security risks in view of the deficiencies of the existing technology, and to solve the problems of low calculation efficiency and insufficient convergence of traditional methods
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[0046] The invention proposes a two-layer evaluation model for solving electric system network security risks by using a cut set constraint calculation method. Solving the two-layer optimization model based on cut-set constraints is divided into three stages: the first stage is to solve the main problem model of network security risk assessment to obtain the initial solution and pass it to the sub-problem; the second stage is to relax the initial solution of the main problem as the network security The variables of the risk assessment sub-problem model; in the third stage, the sub-problem model is solved to obtain the final approximate solution, and the cut constraint is formed and passed to the main problem to realize iterative calculation until the convergence condition is met. The two-layer evaluation model of power system network security risk takes the maximization of system network security risk as the goal of the attacker in the upper layer; the goal of the defender in t...
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The invention discloses a two-layer evaluation model, system and calculation method of electric power system network security risk, including the following steps: step S1, setting the lower bound LB of the objective function value of the main problem and the upper bound UB of the objective function value of the sub-problem, and establishing The main problem model of network security risk assessment; step S2, solve the upper model, relax the attack vector and update the lower limit LB; step S3, establish the network security risk assessment sub-problem model; step S4, solve the lower model, update the upper limit UB, and construct a cut set Constraints; step S5, calculating the convergence error and judging the convergence. The invention overcomes the problems of low efficiency, insufficient convergence, limited solution range and inapplicability to large-scale systems of the current calculation method, and realizes the double-layer evaluation model calculation of network security risks of large-scale power systems. The invention has the advantages of low computational complexity, few iterations and fast convergence, and can effectively evaluate the network attack risk faced by the power system.
Description
technical field [0001] The invention relates to the technical field of electric power systems, in particular to a two-layer evaluation model and a calculation method for electric power system network security risks. Background technique [0002] In recent years, the high integration of information technology and communication technology has promoted the intelligence of the power grid, and at the same time, it has also caused the power grid to face serious threats of cyber attacks. In recent years, cyber attacks on power systems around the world have occurred frequently. For example, power grids in Pakistan, Ukraine, and Israel have all suffered physical or cyber attacks. Cyber attackers can effectively tamper with the working condition data in the power system, which directly affects the decision-making of the power dispatching center, resulting in overloading of transmission lines, load shedding and even cascading failures. Therefore, from the perspective of power system...
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IPC IPC(8): G06F30/20G06Q10/06G06Q50/06G06F111/10
CPCG06F30/20G06Q10/0635G06Q50/06G06F2111/10
Inventor 刘绚杜敏田建伟褚旭朱宏宇
Owner HUNAN UNIV