Robust fault estimation method for discrete switching system based on unknown input observer

Abstract

The invention relates to the technical field of fault diagnosis, and discloses a robust fault estimation method for a discrete switching system based on an unknown input observer. The method comprisesthe following steps: enabling a state vector and a fault vector of an original discrete switching system to be integrated into a state vector of an augmentation system in order to obtain an augmentation system; based on a P radius technology, designing an unknown input observer (UIO) to estimate the state and fault of the augmentation system; giving assumed conditions, and solving the observer through a linear matrix inequality technology and a Schur complementary leader; and analyzing the fault estimation error. Compared with the prior art, the method has the following advantages that the unknown input robust fault estimation observer is designed for the discrete switching system based on the P radius technology, the linear matrix inequality technology and the Schur complementary leaderare used for solving the observer and analyzing the fault estimation error, so that the stability of the error system is ensured, the fault estimation has complete robustness for unknown input interference; and compared with other traditional methods, the method has more accurate boundary and higher efficiency.

Description

technical field [0001] The invention relates to the technical field of fault diagnosis, in particular to a robust fault estimation method of a discrete switching system based on an unknown input observer. Background technique [0002] In recent years, fault estimation methods based on observers, such as sliding mode observers, fuzzy observers, adaptive observers, etc., have been widely used. The fault estimation technology based on the sliding mode observer can perform bounded estimation for constant and time-varying faults, and the fault estimation and fault-tolerant control problems of fuzzy systems have been studied, but when the state trajectory reaches the sliding mode surface, it is difficult to strictly follow the The sliding surface slides against the equilibrium point, but instead traverses back and forth on both sides of the sliding surface, creating chatter. However, the adaptive fault estimation technology based on the observer can only realize the asymptotic es...

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Therefore, adaptive control is much more complicated than conventional feedback control, and the cost is also much higher. Therefore, only when the expected performance cannot be achieved with conventional feedback, it will be considered to use

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