Research on stray inductance extraction method for large-size power capacitor
Stray inductance present in the commutation loop of converters significantly impacts power semiconductor devices.However,accurately extracting stray inductance from large-size power capacitors remains challenging.While the discharge method is the current standard extraction technique,it is unsuitable for capacitors containing multiple resonance frequencies.Leveraging the high accu-racy of the integral method in extracting stray inductance from busbars,an extension has been made to extract stray inductance from large-size power capacitors.Enhanced by a clarified error correction process,the results of the integral method are considered accurate.Despite the integral method yielding highly accurate results,it demands substantial testing resources,poses high-voltage safety hazards,and exhibits low efficiency.This paper presents a stray inductance extraction method utilizing an impedance analyzer,and provides a de-tailed explanation of the testing fixture and impedance compensation method.Comparing the results obtained from the impedance analyz-er with those from the integration method revealed an error of less than 7.3％,which proved the accuracy of the proposed extraction method.In addition,this method offers convenient measurement,strong reusability and high efficiency,without the risks associated with high-voltage testing.
large-size power capacitorstray inductancedischarge methodintegral methodimpedance analyzertesting fixture
万方数据
维普
