Method of current control of three-phase modular multilevel converter with inductance changes allowed
US9413260B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 6, 2015 |
| Grant date | Aug 9, 2016 |
| Priority date | — |
| Expiry date | Jul 6, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M7/08
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Current of a three-phase multilevel modular converter (MMC) is controlled. The control is a division-summation (D-Σ) method yet uses integration to replace the two steps of division and summation. Common D-Σ characteristic equations are used for all areas. Inductance changes are considered in the characteristic equations. Current source is used to control converter. Therefore, the current of the converter can be traced to sinusoidal reference current even when the inductance changes become big. The modulation method and the capacitor-voltage balancing method are submodule unified pulse width modulation (SUPWM) and sorted voltage-balancing method, respectively. The current control directly obtains a law of the current change on each conducting module of an arm. It does not need complex sector judgments and table look-ups. Thus, the amount of computation and memory for a processor can be relatively reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.