HVDC SYSTEM

• US 20100046255A1
• Filed: 12/21/2005
• Published: 02/25/2010
• Est. Priority Date: 12/21/2005
• Status: Active Grant

• Current Assignee: ABB Power Grids Switzerland AG (ABB Limited)
• Original Assignee: ABB Technology Limited (ABB Ltd.)
• Inventors: Pääjärvi, Bo
• Granted Patent: US 8,441,817 B2
• Time in Patent Office: Days
• US Class Current: 363/35
• CPC Class Codes: H02J 3/36 Arrangements for transfer of electric power between ac networks via a high-tension dc link
• CPC Class Codes: Y02E 60/60 Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

Abstract

An HVDC network including a first station including a first converter, a second station including a second converter, each converter including non-extinguishable semiconducting elements. A first transmission conductor and a second transmission conductor. The first station includes a first switching arrangement.

Claims

1. An HVDC network, comprising

a first station comprising a first converter comprising non-extinguishable semiconducting elements;

a second station comprising a second converter comprising non-extinguishable semiconducting elements,

a first transmission conductor, and

a second transmission conductor,

wherein the first station further comprises a first switching arrangement and the second converter further comprises a second switching arrangement for alternating the current flow between the first and second transmission conductor.

2. The HVDC network according to claim 1, wherein the first switching arrangement comprises a first switch and a second switch, and wherein the second switching arrangement comprises a first switch (15) and a second switch.

3. The HVDC network according to claim 2, wherein each of the first switch and the second switch comprises a first circuit breaker and a second circuit breaker.

4. The HVDC network according to claim 1, wherein the first transmission conductor comprises a cable including a polymeric insulation.

5. The HVDC network according to claim 1, wherein the second transmission conductor comprises a cable including a polymeric insulation.

6. The HVDC network according to claim 1, wherein the first station further comprises a control unit for controlling the first switching arrangement and the second switching arrangement.

7. The HVDC network according to claim 6, wherein the control unit comprises a first sensor and a second sensor for sensing a power flow direction.

8. A method for transmission of an effective power flow between a first converter and a second converter of an HVDC network, each converter comprising non-extinguishable semiconducting elements, the first and second converter being connected to each other by a first transmission conductor, and second transmission conductor, the first converter comprising a first DC connection and a second DC connection, and the second converter comprising a first DC connector and a second DC connection, the method comprising:

forming in a first operation mode containing a first direction of the effective power flow a first current path comprising the first DC connection of the first converter, the first transmission conductor and the first DC connection of the second converter, and a second current path comprising the second DC connection of the first converter, the second transmission conductor and the second DC connection of the second converter, and

forming in a second mode of operation containing a second direction of the effective power flow a first current path comprising the first DC connection of the first converter, the second transmission conductor and the first DC connection of the second converter, and a second current path comprising the second DC connection of the first converter, the first transmission conductor and the second DC connection of the second converter.

9. The method according to claim 8, wherein forming the first and second current path comprises operating a first and second switching arrangement.

10. A computer program product, comprising:

a computer readable medium; and

computer program instructions recorded on the computer readable medium and executable by a processor to carry out a method for transmission of an effective power flow between a first converter and a second converter of an HVDC network, each converter comprising non-extinguishable semiconducting elements, the first and second converter being connected to each other by a first transmission conductor, and second transmission conductor, the first converter comprising a first DC connection and a second DC connection, and the second converter comprising a first DC connector and a second DC connection, the method comprising;

forming in a first operation mode containing a first direction of the effective power flow a first current path comprising the first DC connection of the first converter, the first transmission conductor and the first DC connection of the second converter, and a second current path comprising the second DC connection of the first converter, the second transmission conductor and the second DC connection of the second converter, and

forming in a second mode of operation containing a second direction of the effective power flow a first current path comprising the first DC connection of the first converter, the second transmission conductor and the first DC connection of the second converter, and a second current path comprising the second DC connection of the first converter, the first transmission conductor and the second DC connection of the second converter.

11. The computer program product according to claim 10 wherein the computer program instructions are further for providing the computer program instructions at least in part over a network.

12. The computer program product according to claim 11, wherein the network is the internet.