A Security Estimation Method for Networked Industrial Control System
An industrial control system and safety estimation technology, which is applied in the field of safety estimation of networked industrial control systems, can solve problems such as difficult state estimation
Active Publication Date: 2020-10-23
HANGZHOU DIANZI UNIV
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Problems solved by technology
[0004] The purpose of the present invention is to provide a complex network-based industrial control system security estimation method for the problem that the networked industrial control system in our country is difficult to timely and accurately perform state estimation under network attacks
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[0054] A security estimation method for a networked industrial control system, the specific steps are:
[0055] Step (1). Establish a spatial model for state estimation of the networked industrial control system;
[0056] The dynamic equation of the state of the networked industrial control system is established based on the complex network model:
[0057] in,
[0058] Represents the state vector of node i at time k, k=0,1,2..., i∈N, N represents the number of nodes forming a complex network; Respectively represent the temperature, pressure, concentration, flow rate and flow rate of the controlled quantity, means n 0 A column vector of dimension, the superscript T represents the transpose of the matrix;
[0059] Indicates the measured output value of node i at time k, Respectively represent the temperature, concentration and flow of the output volume;
[0060] Γ=diag{γ 1 ,γ 2 ,γ 3 ,γ 4 ,γ 5} represents the internal coupling matrix of the complex network mod...
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The invention discloses a safety estimation method of a networked industrial control system, and solves the problem that an existing method can only monitor the system state in a time-fixed and placed-fixed way and hard to accurately reflect the real-time operation state of a reflection system. The method comprises the steps of establishing a networked industrial control system state estimation model, establishing a safety estimation error system model, and solving an estimator gain matrix. According to the method, a complex network estimation method based on an event triggering strategy is adopted, influence of network attack on the system is considered, a recursive state estimator is designed through an extended Kalman filtering method, and a gain matrix of the state estimator is determined by solving two Riccati difference equations. Based on the event triggering strategy, network burden and energy consumption caused by transmission of a large amount of information are reduced, theconstructed estimator can achieve timely and accurate estimation of the system state under the condition of network attack, and a timely and effective method is provided for safety estimation, monitoring and control of the networked industrial control system.
Description
technical field [0001] The invention belongs to the technical field of automatic control, and relates to a safety estimation method of a networked industrial control system, which can be used for safe operation and estimation of a modern large-scale networked industrial control system in consideration of possible network attacks on important industrial control systems. Background technique [0002] The structure of modern industrial control systems is becoming more and more complex, and it is gradually developing towards networking, which promotes the combination of computer networks and control networks. While broadening the field of industrial control, it also brings huge challenges to the safe operation of industrial control systems. . For example, attacks on industrial control systems by viruses and Trojan horses occur frequently around the world, and their scope of influence, economic loss and duration are far beyond comparison with ordinary network security incidents, ...
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IPC IPC(8): G05B19/418
CPCG05B19/41885Y02P90/02
Inventor 陈云孟雪阳陈张平赵晓东
Owner HANGZHOU DIANZI UNIV