A Fault Diagnosis Method for Switch Tube Open Circuit of Single-phase Cascaded H-bridge Rectifier
A rectifier switch tube and open-circuit fault technology is applied in the field of open-circuit fault diagnosis of single-phase cascaded H-bridge rectifier switches, and can solve the problem that there are few diagnostic methods for single-phase cascaded H-bridge rectifiers.
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[0087] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. The single-phase cascaded H-bridge rectifier switching tube open-circuit fault diagnosis method provided by the invention considers the output side current, the DC side capacitance and the load current, and considers the freewheeling effect of the diode antiparallel with the switching tube. At the same time, the switching device is idealized, and factors such as switching loss, turn-on and turn-off transient, turn-on and turn-off time, conduction tube voltage drop, and leakage current are ignored.
[0088] The basic circuit topology of single-phase cascaded H-bridge rectifier before the power electronic traction transformer is as follows: figure 1 As shown, the basic working principle of the single-phase cascaded H-bridge rectifier is as follows figure 2 shown. The input quantity of the online fault diagnosis algorithm of electric tr...
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