Delta operator-based fault detection method for actuator of boost converter

Abstract

The invention relates to the technical field of fault diagnosis, and discloses a delta operator-based fault detection method for an actuator of a boost converter, which comprises the steps of establishing a boost converter circuit model, and constructing an augmentation vector; giving a general system model containing external interference and actuator faults; designing an unknown input observer, constructing an augmentation vector, and obtaining a corresponding dynamic estimation error system; for a dynamic estimation error system, giving a sufficient condition meeting an H-infinity performance index, and designing a fault observer parameter; and setting a threshold Jth according to a designed observer, constructing a residual evaluation function, and judging whether the system has a fault or not through decision logic. According to the fault detection method designed in the invention, the error dynamic system satisfies the following conditions: (1) the system is asymptotically stable in the absence of faults and interference; and (2) when the system has faults and interference, a certain H-infinity performance index is satisfied under a zero initial condition, and actuator fault detection of the boost converter circuit system can be completed.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a fault detection method for an actuator of a step-up converter based on a delta operator. Background technique [0002] As various industrial systems have higher and higher requirements for safety and reliability in application and research fields, fault diagnosis techniques have attracted extensive attention in recent decades. Fault detection is an important part of fault diagnosis, which can realize rapid detection of faults and early elimination of faults. Among the model-based fault detection methods, the observer-based fault detection method is proved to be an effective method by comparing the value of the residual signal with a pre-designed threshold. [0003] In practical applications, the working process of many engineering systems can be divided into several stages, which can be modeled as a switching system mathematically, and the work between subsystems is ...

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Problems solved by technology

[0004] The applicant currently has an invention for the same model "A Real-time Weighted Fault Detection Method for Boost Converters", which only considers the discrete state of the system and does not consider the system modeling error; when the sampling period is small, " A Real-Time Weighted Fault Detection Method for Boost Converters" has numerical instability problems

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