A boost converter actuator fault detection method based on delta operator

Abstract

The invention relates to the technical field of fault diagnosis, and discloses a fault detection method for a boost converter actuator based on a delta operator, which establishes a boost converter circuit model, constructs an augmented vector; The general system model of ; design the unknown input observer, construct the augmented vector, and get the corresponding dynamic estimation error system; for the dynamic estimation error system, give the satisfying H ∞ The sufficient condition of the performance index, design the parameters of the fault observer; according to the designed observer, set the threshold J th , construct the residual evaluation function, and judge whether the system is faulty or not through decision-making logic. The fault detection method designed in the present invention makes the error dynamic system satisfy: (1) when there is no fault and no disturbance, the system is asymptotically stable; (2) when the system has faults and disturbances, under zero initial conditions, a certain h ∞ The performance index can complete the actuator fault detection of the boost converter circuit system.

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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