Boost converter fault diagnosis method based on multi-innovation recursion least square

Abstract

The invention discloses a Boost converter fault diagnosis method based on multi-innovation recursion least square, and belongs to the field of power converter fault diagnosis. The method comprises thefollowing steps: establishing a hybrid system discrete model of the Boost converter; obtaining a least square recurrence model of the Boost converter; obtaining an innovation scalar quantity according to the least square recurrence model; acquiring an information vector and system output of the Boost converter within a predetermined time range; expanding a multi-information vector according to the information length, and obtaining an information matrix and an output vector; estimating a parameter vector of the Boost converter; determining an estimated value of each element in the Boost converter according to the estimated parameter vector, and judging whether the Boost converter has a fault or not. The problem that the utilization rate of fault diagnosis data of a Boost converter is low at present is solved. The effects of smoothing the parameter estimation value of each element and improving the fault diagnosis precision and convergence speed of the Boost converter are achieved.

Description

technical field [0001] Embodiments of the present invention relate to the field of fault diagnosis of power converters, in particular to a method for fault diagnosis of Boost converters based on multi-innovation recursive least squares. Background technique [0002] With the development of power electronics technology, various types of power converters have been widely used in electric vehicles, power systems, aerospace, agriculture and other fields. With the continuous expansion of application fields, more stringent requirements are put forward for the performance of power converters such as reliability and stability. [0003] Studies have shown that the degradation of electrolytic capacitors, the failure of switching tubes and the failure of solder joints can all lead to failure of power converters. Among them, the degradation of the electrolytic capacitor is the main cause of the failure of the power converter, which is mainly manifested as the increase of the series res...

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Problems solved by technology

[0003] Studies have shown that the degradation of electrolytic capacitors, the failure of switching tubes and the failure of solder joints can all lead to the failure of power converters

Among them, the degradation of electrolytic capacitor is the main cause of power converter failure, mainly manifested as the increase of series resistance

[0004] There are many fault diagnosis methods for power converters, among which the recursive least squares algorithm is widely used because of its simplicity and convenience, but in the face of online power converter fault diagnosis, there are low data utilization, slow convergence speed, Problems such as low recognition accuracy

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