System for discharging electrical power from a high-voltage direct current line to local network
US5187651A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 19, 1991 |
| Grant date | Feb 16, 1993 |
| Priority date | — |
| Expiry date | Nov 19, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/60
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A system for discharging electrical power from a high-voltage direct-current (HVDC) transmission line to a local network, utilizes a first, single-phase converter bridge comprising semiconductor switches which are energized by signals and which are de-energized solely with current zero crossing, and a first, single-phase transformer having a primary winding connected to a HVDC line and a secondary winding; a second converter bridge connected to the secondary winding; a secondary direct voltage network connected to the second converter bridge; a third converter bridge connected to the secondary direct voltage network for generating an alternating current for the local network; and the second and the third converter bridges each comprise ON/OFF controllable semiconductor switches, and the first and the second converter bridges commutate with a frequency that is 2-4 times higher than the normal frequency of the local network and the third converter bridge commutates at the normal frequency of the local network.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.