Random fault detection method of networked control system with packet loss

A technology of networked control and random faults, applied in general control systems, control/adjustment systems, test/monitoring control systems, etc., can solve problems such as random faults and achieve the effect of reducing conservatism

Active Publication Date: 2017-10-20
西安四向互联网络科技有限公司
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Problems solved by technology

However, when most of the literature studies the fault detection problem of NCS, it is assumed that the fault signal is deterministic, but due to the unpredictable change characteristics of the network, in reality, the fault occurs randomly

Method used

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  • Random fault detection method of networked control system with packet loss
  • Random fault detection method of networked control system with packet loss
  • Random fault detection method of networked control system with packet loss

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Embodiment

[0127] Using a random fault detection method for a networked control system with packet loss proposed by the present invention, in the absence of external disturbances and faults, θ k = 0, the augmented system is mean square exponentially stable. when θ k When ≠0, the system is mean square exponentially stable and satisfies H ∞ Performance. The specific implementation method is as follows:

[0128] The controlled object is a closed-loop networked control system, the mathematical model of the controlled object is formula (1), and its system parameters are given as

[0129] C=[0.6 0.8 0], D=0.1

[0130] Assuming the quantization density of the system ρ=0.6, use the MATLAB LMI toolbox to solve for different packet loss probabilities and random failure probability The optimal H under ∞ Performance indicators, as shown in Table 1. It can be seen that as the probability of failure in the network channel increases (the probability of packet loss decreases), the correspond...

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Abstract

The invention discloses a random fault detection method of a networked control system with packet loss. The method, which takes into account the fact that a networked control system has the problems of random packet loss, quantization error and random faults, includes the following steps: building a model of a networked control system with random faults; building a model of a fault detection filter; introducing a residual evaluation mechanism to detect whether there is a fault; obtaining sufficient conditions for the exponential stability in mean square of an augmented system and the existence of a fault detection filter through the Lyapunov stability theory and a linear matrix inequality analysis method; using a Matlab LMI tool kit to solve the optimization problem, and giving optimal parameters (as shown in the description) of the fault detection filter; and judging whether there is a fault according to the established residual mechanism. The method takes into account the fact that a fault occurs randomly and the occurrence probability of faults satisfies the Bernoulli distribution. The technical scheme is suitable for general fault detection methods. The conservative property is reduced.

Description

technical field [0001] The invention relates to a networked control system, in particular to a random fault detection method for a networked control system with packet loss. Background technique [0002] A networked control system (Networked Control System, NCS) is a closed-loop feedback control system composed of connected components in the system through a shared communication channel (such as a network). Compared with the traditional point-to-point connection feedback control system, the networked The control system has the advantages of convenient installation and maintenance, high flexibility and easy reconfiguration. However, the introduction of the network will bring some new problems, such as data quantization, network-induced delay, data packet loss, etc., which will affect the performance and stability of the system, and even cause failures. In actual engineering, networked control systems have high requirements on performance, safety and reliability. If some faul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B23/02
CPCG05B23/0243G05B2219/24065
Inventor 潘丰高敏邹金鹏
Owner 西安四向互联网络科技有限公司
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