Patent · US Active

Method and power converter for determining cell capacitor degradation in a converter cell

US9651603B2 · kind B2 · utility

2Cited by
2References
8Claims
0Family size

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Key dates

Filing dateNov 27, 2014
Grant dateMay 16, 2017
Priority date
Expiry dateNov 27, 2034

Classification

  • Technology area (CPC H)Electricity
  • CPC primaryH02M1/0006
  • WIPO fieldElectrical machinery, apparatus, energy
  • WIPO sectorElectrical engineering

Abstract

A method and arrangement for determining a capacitor degradation parameter associated with the degree of degradation of a cell capacitor in a converter cell of a power converter including a plurality of identical converter cells, including redundant converter cells, which converter cell, prior to determining the capacitor degradation parameter, has been bypassed. The method includes a) obtaining a measurement parameter value associated with discharging of the cell capacitor, forming a dc-link, from a measurement start voltage level at a measurement start time to a measurement end voltage level at a measurement end time, and b) determining a value of the capacitor degradation parameter based on the measurement parameter value.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.