Circulating current injection control
US10153712B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 15, 2017 |
| Grant date | Dec 11, 2018 |
| Priority date | — |
| Expiry date | May 15, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M7/539
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In one example, a power converter includes a modular multilevel converter (MMC) electrically coupled between a first power system and a second power system. The MMC includes an arrangement of switching submodules, and the switching submodules include an arrangement of switching power transistors and capacitors. The MMC also includes a controller configured to inject a common mode frequency signal into a circulating current control loop. The circulating current control loop is relied upon to reduce at least one low frequency component in power used for charging the capacitors in the switching submodules. By injecting the common mode frequency signal into the circulating current control loop, the switching submodules can be switched at higher frequencies, the capacitances of the capacitors in the MMC can be reduced, and the power density of the MMC can be increased.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.