Inverter apparatus islanding operation detecting method and inverter apparatus capable of surely detecting an islanding operation with a simple construction
US6172889A · kind A · utility
32Cited by
3References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 29, 1997 |
| Grant date | Jan 9, 2001 |
| Priority date | — |
| Expiry date | May 29, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J3/388
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
There is provided an inverter apparatus islanding operation detecting method capable of surely detecting an islanding operation with a simple construction. A distortion for causing a variation in an output frequency of an inverter apparatus in an islanding operation stage is applied to an inverter output waveform. With this arrangement, even when the inverter apparatus is disconnected from an AC power system in a state in which a power factor of a load impedance is proximate to one, a frequency variation is generated in an inverter output, thereby ensuring detection of the islanding operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.