A Method for Inverter Intelligent Fault Reasoning
An inverter and fault technology, applied in the field of inverter intelligent fault reasoning, can solve the problems of inaccurate diagnosis results, difficult fault symptom information, poor applicability of diagnosis methods, etc.
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Embodiment 1
[0091] Insufficient evidence information in Example 1
[0092] combined with figure 1 , the symptom information collected by the fault information collection system includes: Phase B negative waveform distortion occurs (X 23 = 2) and C-phase positive waveform distortion occurs (X 24 =2).
[0093] The single failure probability data of the failure layer calculated by formula (8) is:
[0094] P(X 16 =2|X 23 =2,X 24 = 2) = 15.02%
[0095] P(X 17 =2|X 23 =2,X 24 = 2) = 25.29%
[0096] P(X 18 =2|X 23=2,X 24 = 2) = 32.25%
[0097] P(X 19 =2|X 23 =2,X 24 = 2) = 52.87%
[0098] The probability of failure in the DC link is the highest, and then the single failure probability is ruled out, P(X 19 =2|X 23 =2,X 24 =2)-P(X 18 =2|X 23 =2,X 24 =2)=20.62%>20%, this case satisfies rule 2, and the fault type is judged to be a single fault, so it can be judged that the inverter fault is a DC link fault (X 19 ).
[0099] The parent node of the DC link fault is: the upper...
Embodiment 2
[0104] Example 2 Evidence information conflict
[0105] combined with figure 1 , the symptom information collected by the fault information collection system includes: Phase A negative waveform distortion occurs (X 21 =2), B-phase positive waveform distortion does not occur (X 21 =1) and B-phase negative waveform distortion occurs (X 23 = 2), it is found by inspection that the lower bridge arm pulse of the B phase is absent (X 6 =2). Judging from the evidence presented, this case is a case of conflict of evidence. Evidence comes from the inverter health layer and the fault symptom layer. Evidence from health layer Phase B lower arm pulse missing (X 6 ) indicates that there is a phase B fault (X 17 ), but this conclusion is not supported by the fault symptom layer.
[0106] The single failure probability data of the failure layer calculated by formula (8) is:
[0107] P(X 16 =2|X 6 =1,X 21 =2,X 22 =2,X 23 = 2) = 24.51%
[0108] P(X 17 =2|X 6 =1,X 21 =2,X 22 =...
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