Method for determining the amplitude and phase angle of a measuring signal corresponding to a current or voltage of an electrical power supply network
US6820017B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 22, 2002 |
| Grant date | Nov 16, 2004 |
| Priority date | — |
| Expiry date | Apr 3, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R19/25
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for determining the amplitude and phase angle of a measuring signal corresponding to a current or a voltage on an electrical power supply network by using sampled values of the measuring signal, a model of the measuring signal containing at least a sinusoidal component being used to calculate the amplitude and phase of the measuring signal with the sampled values by applying a recursive least-squares estimation method.In order to be able to determine the frequency of the measuring signal together with the amplitude and the phase angle, use is made of a model of the measuring signal in accordance with the relationship y=A·sin(2&pgr;ft+&phgr;), and by using this model and the sampled values (ym), the determination of the frequency of the measuring signal (um) as well is carried out via a recursive nonlinear least-squares estimation method. By expanding the signal model, measuring signals with a DC component and with frequencies that change over time also can be investigated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.