System and method for low speed control of polyphase AC machine
US8830705B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 19, 2012 |
| Grant date | Sep 9, 2014 |
| Priority date | — |
| Expiry date | Mar 5, 2033 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E10/76
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
A power converter configured to improve power capture in a wind turbine during low wind speed operation is disclosed. The power converter converts the power generated by the alternator of the wind turbine into a suitable AC current for delivery to a utility grid or to an electric load independent of the utility grid. The power converter is configured to operate in multiple operating modes, utilizing both synchronous and non-synchronous control methods, to extend the operating range of the power converter. During non-synchronous operation, the power converter utilizes a modulation routine that may either vary the dead-time compensation period during a constant modulation period or vary the modulation period with a constant on-time. A seamless transfer between non-synchronous and synchronous control methods with low total harmonic distortion (THD) improves the range of power generation for wind generators.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.