Method and power converter for determining cell capacitor degradation in a converter cell
US9651603B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 27, 2014 |
| Grant date | May 16, 2017 |
| Priority date | — |
| Expiry date | Nov 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.