Three-level cascaded inverter fault diagnosis device and diagnosis method thereof

A fault diagnosis device and technology of three-level inverters, which are applied in power supply testing and other directions, can solve problems such as poor versatility, and achieve the effects of easy inspection, low cost, and small changes

Active Publication Date: 2018-11-23
SOUTHWEST JIAOTONG UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

However, the method of analyzing the model is only applicable to specific circuits, and its versatility is poor.

Method used

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  • Three-level cascaded inverter fault diagnosis device and diagnosis method thereof
  • Three-level cascaded inverter fault diagnosis device and diagnosis method thereof
  • Three-level cascaded inverter fault diagnosis device and diagnosis method thereof

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Embodiment Construction

[0030] A fault diagnosis device for a three-level cascaded inverter provided by the present invention includes a three-level cascaded inverter, figure 1 The specific structure of the three-level cascaded inverter shown is that N three-level inverter units are connected in series, the 1a port of unit 1 is connected to the L port of the load, and the 1b port of unit 1 is connected to the 2a port of unit 2 , port 2b of unit 2 is connected to port 3a of unit 3, and so on; port ia of unit i is connected to port (i-1)b of unit i-1, port ib of unit i is connected to ( i+1)a port is connected, and so on, the Na port of unit N is connected to the (N-1)b port of unit N-1, and the Nb port of unit N is connected to the load G terminal, i∈[1,N] ; Connect the voltage sensor to the clamping point of the A-phase bridge arm or B-phase bridge arm of N three-level inverter units in parallel to realize the state monitoring of all bridge arms of the cascaded inverter; for the three-level inverter ...

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Abstract

The invention provides a three-level cascaded inverter fault diagnosis device and a diagnosis method thereof, which relate to the technical field of electric power apparatus fault diagnosis. In the method, through calculating the average clamp voltage value of a bridge arm under full modulation in an open circuit fault state, a fault database is built; the real-time calculated average value of clamp voltage of each bridge arm is converted to a full modulation degree, and through the fault database, normalization processing is carried out; and a threshold is set for the processing result, and comprehensive diagnosis is carried out based on whether the processing result meets a threshold requirement and the comparison result between an average clamp voltage value corresponding to a modulation wave positive half wave and an average clamp voltage value corresponding to a negative half wave. The method only calculates the average clamp voltage value of one bridge arm under a single-tube anddouble-tube fault state, the fault database is built, and thus, real-time fault diagnosis by the cascaded system with the bridge arm as a unit can be realized. As for the existing cascaded inverter,in order to realize fault diagnosis, only one voltage sensor is added to each bridge arm clamp position, and the method has the advantages of little system modification and low cost.

Description

technical field [0001] The invention relates to the technical field of electric appliance fault diagnosis. Background technique [0002] The three-level cascaded inverter is easy to be modularized and expandable, and the harmonic content of the output voltage is low, which reduces the volume and weight of the output filter inductor and capacitor. Therefore, it is widely used in the fields of high-voltage and high-power new energy generation widely used. However, since the cascaded inverter uses more power switching devices and operates under high voltage, high current and high temperature for a long time, the cascaded system has a high failure rate and low reliability. In order to ensure the safe and reliable operation of the cascaded inverter, the monitoring of the status of the cascaded inverter can not only eliminate the fault in time, but also help to ensure the work of the maintenance personnel and reduce the economic cost caused by the failure of the cascaded inverter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/40
CPCG01R31/40
Inventor 何晓琼任海军韩鹏程舒泽亮
Owner SOUTHWEST JIAOTONG UNIV
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