Method for defending data integrity attack in direct state estimation of power system

Abstract

The invention discloses a method for defending a data integrity attack in direct state estimation of a power system. The method comprises the following steps: estimating a real-time state of a direct current system by using a weighted least square method; constructing a minimum cost data integrity attack model to simulate the behavior of an attacker; resolving the minimum cost data integrity attack by using an algorithm based on linear transformation to obtain an optimal attack vector at the moment; if the current optimal attack vector is obtained, realizing a PMU optimized configuration defense strategy based on a greedy algorithm, and after the configuration is completed, the occurrence of the data integrity attack is prevented from the source, and meanwhile, the complete observability of the system is guaranteed. By adopting the method disclosed by the invention, the data integrity attack in the direct state estimation of the power system can be accurately and quickly defended, and the accuracy and security of the state estimation of the power system are improved.

Description

technical field [0001] The invention belongs to the technical field of power system information security and control, and relates to a method for resisting data integrity attacks in power system DC state estimation Background technique [0002] With the construction of large-capacity long-distance transmission systems and the realization of large-scale grid interconnection, the security and stability of modern power systems have become increasingly prominent. Data integrity attack, that is, the attacker tampers with the sensor measurement data received by the energy management system (EMS) and changes the result of the state estimation according to the predetermined goal when the attacker has a certain understanding of the power system topology, and finally makes the EMS use Wrong estimates result in incorrect power adjustment or control decisions. [0003] In the current power system, the data integrity attack against EMS will pose a serious threat to the operation securit...

AI Technical Summary

Problems solved by technology

Due to the high cost of PMUs, it is unrealistic to configure PMUs on every node in the entire network, so we are committed to finding an optimal PMU configuration strategy, so that the power system can use the least number of PMUs. Successfully defend against data integrity attacks and make the system fully observable, but there is no similar disclosure in the prior art

Images