Zero-sequence parameter measurement and ground voltage control method for resonant ground system based on virtual ground principle
US11143712B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 5, 2019 |
| Grant date | Oct 12, 2021 |
| Priority date | — |
| Expiry date | Jan 29, 2040 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E40/50
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present disclosure provides a zero-sequence parameter measurement and ground voltage control method for a resonant ground system based on a virtual ground principle. The method, based on the virtual ground principle, arbitrarily specifies a point K in a phasor plane in which three-phase voltages are located. A virtual ground control method is used to achieve virtual ground of the point K, and an accurate zero-sequence resonant parameter of a zero-sequence network under an action of the excitation {dot over (U)}KN can be obtained. When a single-phase ground fault occurs, a ground phase is specified as a target working point, and a control method is applied to cause the zero-sequence network to accurately resonate, and a voltage of this phase relative to ground is 0. At this time, both a residual voltage and a residual current of the fault phase are effectively suppressed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.