Fault Detection Method for Feedback Control Systems Based on Disturbance Decoupling Observer

Abstract

The present invention proposes a method for fault detection in feedback control systems based on a disturbance decoupling observer, comprising: constructing a linear discrete feedback control system containing unknown disturbances; constructing a disturbance decoupling observer (DDO) when the feedback control variable is known, configuring its parameters, and calculating the estimated error and closed-loop residual under static feedback control; substituting the feedback control law into the DDO, reconstructing the disturbance decoupling observer (DDO), adjusting its structure and reconfiguring its parameters, and calculating the estimated error and closed-loop residual under dynamic feedback control; and comparing the estimated error and closed-loop residual under static and dynamic conditions to verify the performance of the disturbance decoupling observer (DDO) after structural adjustment and parameter reconfiguration. This method focuses on the DDO-based fault detection problem for a class of closed-loop systems under feedback control, aiming to make the observer applicable under dynamic feedback control by changing the observer structure and redesigning its parameters.

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