High-frequency fault component based distance protection system and method for a transmission line of a renewable energy source system
US10908202B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 15, 2020 |
| Grant date | Feb 2, 2021 |
| Priority date | — |
| Expiry date | Sep 15, 2040 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E10/56
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A distance protection system and method based on a high-frequency fault component is provided for a renewal energy source (RES) system. The voltage drop caused by a fault has a full frequency of components and this can be extracted by a wavelet transform. A frequency selection principle that renders high-frequency impedance models a stable impedance phase angle is determined. On this basis, internal and external faults with respect to a transmission line are determined by comparing the magnitude of a high-frequency operating voltage with the magnitude of a high-frequency voltage at the fault point. This disclosed protection system and method can eliminate the influence of frequency offset and weak feed of the RES system by using high-frequency signals generated by voltage drops at the fault point, and can also tolerate signal noises and fault resistance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.