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
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[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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