Method for fault diagnosis of three-phase full-bridge rectifier circuit thyristor

A technology of thyristor failure and rectification circuit, which is applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of weak normalization ability of neural network detection methods, and achieve easy promotion and use, overcome weak normalization ability and stability Good results

Inactive Publication Date: 2016-10-26
XIAN UNIV OF SCI & TECH
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method for diagnosing thyristor faults in three-phase full-bridge rectifier circuits in view of the deficiencies in the prior art above. Classification and positioning, hi

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  • Method for fault diagnosis of three-phase full-bridge rectifier circuit thyristor
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  • Method for fault diagnosis of three-phase full-bridge rectifier circuit thyristor

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[0035] Such as figure 1 with figure 2 As shown, the method for diagnosing the fault of a thyristor for a three-phase full-bridge rectifier circuit of the present invention includes the following steps:

[0036] Step 1: Build a sample set of thyristor failures, the specific process is as follows:

[0037] Step 101: Determine the number of thyristor fault state types D in the three-phase full-bridge rectifier circuit 2: the number of thyristor fault state types in the three-phase full-bridge rectifier circuit 2 in which one thyristor fails to cause the output voltage waveform change on the load 3 is 6; Two thyristors in the three-phase full-bridge rectifier circuit 2 fail to cause the output voltage waveform of the load 3 to change. The number of thyristor fault state types is 15; the three-phase full-bridge rectifier circuit 2 has three thyristors fail to cause the output voltage waveform on the load 3 The number of changing thyristor fault state types is 18, D is a positive intege...

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Abstract

The invention discloses a method for fault diagnosis of a three-phase full-bridge rectifier circuit thyristor. The method comprises steps of: 1, constructing a thyristor fault sample set: 101, determining the quantity D of thyristor fault state types in a three-phase full-bridge rectifier circuit; 102, acquiring each type of thyristor fault state data and expressing a matrix space; 103, constructing a matrix space sample; 2, classifying and positioning a thyristor fault: 201, extracting a fault vector beta; 202, solving the distance d(beta, w) from the fault vector beta to the matrix space sample Si; 203, completing the calculation process of the value of d(beta, w); and 3, synchronously outputting a thyristor fault processing result. The method is novel in design; the fault is classified and positioned by adopting a method of vector-to-subspace distance, so that the method is high in precision, small in calculation amount, intuitive, quick and effective, overcomes the defect of weak normalization capability of a neural network detection method in the prior art, and eliminates local minimum points.

Description

technical field [0001] The invention belongs to the technical field of fault diagnosis, and in particular relates to a method for fault diagnosis of a thyristor of a three-phase full-bridge rectifier circuit. Background technique [0002] Once the rectification device fails, it will cause damage to electronic products and traffic paralysis, and it will cause major accidents and threaten the safety of people's lives and properties. Therefore, fault detection for power electronic devices is extremely important. A large number of studies have shown that the performance degradation of most power electronic circuits is caused by the failure of components in the circuit, and the performance and indicators of components directly affect the performance of the entire circuit. Under typical operating conditions, the IGBT failure rate is 31%, the inductor device failure rate is 6%, and the diode failure rate is 3%. Therefore, in order to realize the fault prediction of power electron...

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Application Information

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IPC IPC(8): G01R31/26G01R31/02
CPCG01R31/263G01R31/50
Inventor 杜京义蔡驰高瑞周艳玲王立春殷聪赵国欣
Owner XIAN UNIV OF SCI & TECH
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