Effect of Multilevel Inverter Supply on Core Losses in Magnetic Materials and Electrical Machines
Research output: Contribution to journal › Article › Scientific › peer-review
Details
| Original language | English |
|---|---|
| Article number | 6980114 |
| Pages (from-to) | 736-744 |
| Number of pages | 9 |
| Journal | IEEE Transactions on Energy Conversion |
| Volume | 30 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 1 Jun 2015 |
| Publication type | A1 Journal article-refereed |
Abstract
The effect of multilevel inverter supply on power losses in magnetic cores and electrical machines is studied. A dynamic numerical model for the hysteresis, eddy current, and excess losses in a core lamination is first developed. By both measurements and simulations for a ring-core inductor, we demonstrate how increasing the number of inverter voltage levels decreases the iron losses when compared with traditional two-level supply. Although the switching frequency has a significant impact on the iron losses in the case of a traditional two-level inverter, using three or five voltage levels makes the losses almost independent of the switching. Finally, finite-element simulations show that similar reductions are also possible for the core losses of 150-kVA and 12.5-MW wound-field synchronous machines, in which rather low switching frequencies are typically used. Calorimetric loss measurements are also presented for the 150-kVA machine in order to confirm the significant effect of switching frequency on the core losses with two-level inverter supply.
ASJC Scopus subject areas
Keywords
- Eddy currents, electrical machines, excess loss, finite-element analysis, iron loss, magnetic hysteresis, magnetic materials, multilevel converter, pulse width modulation