Application of phase-locked loop (PLL) in oscillation monitoring for interconnected power systems
US8471610B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 25, 2011 |
| Grant date | Jun 25, 2013 |
| Priority date | — |
| Expiry date | Oct 25, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/08
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The present invention relates to a method for accurately detecting oscillations and improving stability of power systems. The method includes the steps of providing a phase-locked loop having a phase detector, a loop filter, and a number-controlled oscillator. The method further includes the steps of extracting an input signal from the power system, using the phase-locked loop to track the frequency and phase of a targeted mode in the input signal, and creating a locally generated reference signal to fit the input signal and to allow the input signal's modal information to be obtained. The method further includes the step of performing mode shape analysis utilizing the reference phase signals constructed from the tracked frequencies.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.