Issued Patents All Time
Showing 1–23 of 23 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9667043 | Device for high frequency current damping | — | 2017-05-30 |
| 9112347 | DC grid and a method of limiting the effects of a fault in a DC grid | Bertil Berggren, Jürgen Häfner, Kerstin Linden, Lidong Zhang | 2015-08-18 |
| 9054557 | Voltage balancing of symmetric HVDC monopole transmission lines after earth faults | — | 2015-06-09 |
| 9000623 | Using the transfer switch of a hybrid circuit breaker as selector switch | Bertil Berggren | 2015-04-07 |
| 8970222 | Line fault detector | — | 2015-03-03 |
| 8947843 | Fast breaker failure detection for HVDC circuit breakers | — | 2015-02-03 |
| 8946917 | Method for controlling power flow within a wind park system, controller, computer program and computer program products | Per Holmberg, Ying Jiang-Häfner | 2015-02-03 |
| 8884176 | HVDC breaker and control apparatus for controlling an HVDC breaker | — | 2014-11-11 |
| 8847430 | Power flow control in a meshed HVDC power transmission network | — | 2014-09-30 |
| 8817427 | Current limitation system for limiting the effects of a fault in a DC grid and a method of operating a current limitation system | Bertil Berggren, Jürgen Häfner, Kerstin Linden, Lidong Zhang | 2014-08-26 |
| 8736112 | Multi-terminal DC transmission system and method and means for control there-of | Kerstin Linden, Gunnar Flisberg, Per Holmberg | 2014-05-27 |
| 8553433 | DC voltage compensation in a multi-terminal HVDC power transmission network | — | 2013-10-08 |
| 8345457 | Voltage source converter for high voltage direct current power transmission | Gunnar Asplund | 2013-01-01 |
| 8339818 | Method and device to compensate for an asymmetrical DC bias current in a power transformer connected to a high voltage converter | — | 2012-12-25 |
| 8081497 | Converter station | Ulf Radbrant | 2011-12-20 |
| 8014178 | Converter station | Ulf Radbrant | 2011-09-06 |
| 6570384 | Location of a cable in a dc connection in a bipolar 12-pulse system for transmission of electrical energy by means of high-voltage direct current | — | 2003-05-27 |
| 5701239 | High-voltage direct current transmission installation having a high voltage regulation capability | Per-Erik Bjorklund, Tomas Jonsson | 1997-12-23 |
| 5677852 | Method and arrangement for detecting and damping transcient oscillations at or near a natural resonant frequency in a power transmission system | — | 1997-10-14 |
| 5627735 | Method and device for compensation of unbalance in a series compensated converter station | Per-Erik Bjorklund, Tomas Jonsson | 1997-05-06 |
| 5621626 | Method and device for control of an installation for transmission of high-voltage direct current | Per-Erik Bjorklund, Tomas Jonsson | 1997-04-15 |
| 4259713 | High voltage direct current transmission | Gunnar Flisberg | 1981-03-31 |
| 4199804 | Method and apparatus for controlling the alternating voltage of a static convertor | — | 1980-04-22 |