Method and apparatus for measuring volt-amps reactive power using synthesized voltage phase shift
US5243536A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 20, 1992 |
| Grant date | Sep 7, 1993 |
| Priority date | — |
| Expiry date | May 20, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06Q50/06
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In the present invention, true volt-amperes reactive power is measured by sampling instantaneous voltage values of voltage and substantially simultaneously instantaneous values of current of an arbitrary waveform, multiplying the voltage samples by the discrete Hilbert transform (corrected by a sign inversion) to obtain voltage samples of all frequencies shifted by -90.degree. over the bandwidth of the signal of interest and then multiplying this quadrature voltage sample by the corresponding current samples to obtain a true value for VARs, i.e., proportional to the instantaneous volt-amperes reactive power under all conditions. The sampling rate and the period of sampling determine the bandwidth and accuracy of the sampling technique. The invention can be implemented in software or in suitable hardware components capable of sampling and delaying the signal of interest.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.