Apparatus and method for out-of-step protection using the analysis of trajectories of electrical measurements in state plane
US9529057B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Jul 24, 2013 |
| Grant date | Dec 27, 2016 |
| Priority date | — |
| Expiry date | Jul 24, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H83/20
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Various embodiments are described herein for a device and method for predicting an out-of-step or transient instability condition in a power system due to a disturbance, such as a fault, where the power system comprises a power generator. The method comprises determining values for a state plane trajectory for the power generator during the disturbance based on using an internal voltage angle of the power generator or an equivalent power generator and a during fault rotor speed of the power generator or equivalent power generator as state variables, determining time scale values; determining values for a critical state plane trajectory for the power generator after clearing the fault, determining values for a state plane trajectory for the power generator after clearing the fault, determining a critical clearing angle and a critical clearing time, and predicting that the power generator will be stable or unstable by comparing the time to clear the fault with the critical clearing time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.