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Three-level active filter IGBT open-circuit fault positioning method

A source filter, open-circuit fault technology, applied in the field of three-level active filter IGBT open-circuit fault location, can solve the problem of difficulty in judging power device faults

Inactive Publication Date: 2016-11-09
CHINA UNIV OF MINING & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a three-level active filter IGBT open-circuit fault location method to solve the problem that the power device fault judgment of the existing active filter is very difficult

Method used

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  • Three-level active filter IGBT open-circuit fault positioning method
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  • Three-level active filter IGBT open-circuit fault positioning method

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Embodiment 1

[0032] Embodiment 1: the fault location method includes the following steps:

[0033] Step 1: Acquisition of analog signals, including the three-phase incoming line voltage e of the three-level three-phase four-wire active filter A 、e B 、e C , three-phase output current i A i B i C , the DC bus voltage, the DC bus voltage includes the upper bus voltage u dc1 and lower bus voltage u dc2 , and the neutral current i N ;

[0034] Step 2: When the fault does not occur, according to the control pulse S of the active filter x state, the S x The status can be directly read by the controller, and the DC bus voltage signal collected in step 1 can be used to calculate the potential V of the three-phase output point X of the active filter for the midpoint M of the DC bus of the active filter XM , namely V AM , V BM , V CM , where X=A or B or C;

[0035] Step 3: According to the part of the signal collected in step 1, substitute it into the formula

[0036] ...

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Abstract

The invention discloses a three-level active filter IGBT open-circuit fault positioning method and belongs to a frequency converter IGBT fault diagnosis method. According to the fault positioning method, level of a three-phase output point X of an active filter for a midpoint M of a DC bus is observed through two concrete methods, and positions of IGBTs specifically generating open-circuit faults are determined through similarity comparison. One method is that a level difference of the three-phase output point X for the midpoint M of the bus is solved in real time through a circuit theoretical loop equation, for representing an actual real level difference. The other method is that first of all, it is assumed that four X-phase IGBTs are respectively open-circuited, the level difference of the three-phase output point X for the midpoint M of the bus after the four X-phase IGBTs are open-circuited is obtained through current loop analysis reckoning, for representing a reckoned level difference. Since there is one, and only one waveform close to the level difference solved through the first method in the reckoned level difference, the faults can be determined. The method has the following advantages: 1, the method is independent from load types; 2, an accurate diagnosis can still be made under the condition of load abrupt change; 3, the accuracy is high; and 4, additional hardware cost is unnecessary.

Description

technical field [0001] The invention relates to a frequency converter IGBT fault diagnosis method, in particular to a three-level active filter IGBT open circuit fault location method. Background technique [0002] Frequency converters are widely used in the field of motor speed regulation. Frequency converters must use power switching devices with high switching frequencies. Power switching devices are often damaged. Once a power device fails, it will affect the system work or even cause shutdown. According to statistics, power device faults account for more than 70% of inverter faults. Therefore, it is very important for inverters to quickly and effectively locate faults in power devices and take protection and fault tolerance measures. [0003] The research has found many fault diagnosis methods for inverter power devices, such as PARK vector method, neural network method and so on. These methods are only applicable to the frequency conversion speed regulation system, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02
CPCG01R31/50
Inventor 唐轶王珂张传金王扬
Owner CHINA UNIV OF MINING & TECH
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