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Three-level inverter open-circuit fault diagnosis method and system based on improved CNN

A three-level inverter and open-circuit fault technology, which is applied in the field of three-level inverter open-circuit fault diagnosis based on improved CNN, can solve problems such as manual selection, uncertainty, and limited promotion, and achieve the effect of avoiding losses

Pending Publication Date: 2022-02-11
HEFEI UNIV OF TECH
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Problems solved by technology

The results are uncertain and susceptible to interference from artificial selection, signal characteristics, noise, etc., and its complexity limits the promotion of many feature extraction methods

Method used

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  • Three-level inverter open-circuit fault diagnosis method and system based on improved CNN
  • Three-level inverter open-circuit fault diagnosis method and system based on improved CNN
  • Three-level inverter open-circuit fault diagnosis method and system based on improved CNN

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Embodiment Construction

[0058] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0059] Refer to attached figure 1 , the schematic flow chart of the method of this embodiment includes the following steps:

[0060] (1) Build an NPC three-level inverter test platform;

[0061] (2) Extract the three-phase current signal within one cycle (when any phase current in the three-phase current crosses zero),

[0062] At the same time, a period of three-phase current is recorded and used as network input, and the sampling frequency is 2000Hz.

[0063] In this embodiment, the three-phase current is reconstructed and converted into three-channel two-dimensional data.

[0064] Specifically, the 400 data points measured in one cycle are reorganized into a 20×20 matrix, and the three-phase currents correspond to three channels respectively, forming a 20×20×3 input vector.

[0065] (3) Obtain input vectors under all fault features and ...

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Abstract

The invention discloses a three-level inverter open-circuit fault diagnosis method based on an improved CNN (Convolutional Neural Network). The method comprises the following steps: (1) establishing an NPC three-level inverter test platform; (2) extracting a three-phase current signal in one period; (3) acquiring input vectors under all fault features; (4) simulating 79 open-circuit faults by controlling driving waveforms; (5) constructing a CNN network model; and (6) applying the trained CNN to a test set. The invention further comprises a three-level inverter open-circuit fault diagnosis system based on the improved CNN. According to the present application and development situation of the inverter, the fault characteristics of the most common NPC three-level inverter of the inverter are studied in detail, the open-circuit fault diagnosis method for the NPC three-level inverter is established, and effective state evaluation can be performed on each module through real-time current monitoring; and the loss of the whole system caused by overlong open circuit time of the device is avoided through real-time monitoring.

Description

technical field [0001] The invention relates to the technical field of power system fault diagnosis, in particular to an improved CNN-based three-level inverter open-circuit fault diagnosis method and system. Background technique [0002] Diode-clamped three-level inverter (NPC) is the first proposed multi-level inverter topology. Compared with the traditional two-level inverter, it has two diodes to clamp the DC voltage to three levels of high-medium-low, so that each switching tube can withstand half the voltage and lower switching frequency Under the working conditions, the output waveform is better than that of the traditional two-level inverter. The three-level inverter can effectively reduce the power loss of the device and the harmonic content in the circuit in the actual application process, and has been widely used in the power market. [0003] Power system device faults can be divided into hard faults and soft faults. The former will cause a change in the circui...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/54
CPCG01R31/54
Inventor 何怡刚袁伟博李志刚李兵
Owner HEFEI UNIV OF TECH
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