Harmonic component measuring method for power system
US6208945A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Jun 18, 1998 |
| Grant date | Mar 27, 2001 |
| Priority date | — |
| Expiry date | Jun 18, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R27/02
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Frequencies fx between the measurement harmonic (mth-degree harmonic) and the (m.+-.1)th-degree harmonics are determined from an expression of fx=(fs*m).+-.{(fs/n)*k)} where n and k are each an integer. Currents of inter-harmonics of the frequencies fx above and below the measurement harmonic are injected into an inject point in a power system in n cycles of the fundamental wave. Voltage at the inject point based on the injected currents and currents at least either upstream or downstream from the inject point are measured. Admittances for the inter-harmonics above and below the measurement harmonic on at least either the upstream or downstream side from the harmonic inject point are calculated from the measurement results. Interpolation processing based on the calculation results is performed, thereby finding and determining an admittance for the measurement harmonic.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.