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
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[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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