Project Name: DolWin1

Update: 16/06/2015

DolWin1 HVDC System

No. / ITEM / Terminal #1 / Terminal #2
1 / Type of
Interconnection / HVDC, submarine cable
2 / Type of
Converter / CTLC
3 / HVDC
Configuration / Symmetrical Monopole
4 / Converter Station Name / DolWin Alpha / UW Dörpen WestKonverter1
5 / Location
(Country, City) / Offshore platform (DolWin Alpha) NNW of the island Borkum, Germany / Dörpen, Germany
6 / AC System
Frequency / 50 Hz / 50 Hz
7 / AC System
Voltage / 155 kV offshore / 400 kV onshore
8 / Short Circuit
Capacity / 0 … 1200 MVA / 13094 MVA
9 / Short Circuit
Ratio (ESCR) / N.A. / N.A.
10 / Main Purpose / Grid connection of the offshore wind farms Borkum West II, BorkumRiffgrundand MEG Offshore 1 via offshore HVDC platform with CTLC HVDC technology.
11 / DC Voltage / ± 320 kV
12 / DC Current / 1260 A
13 / Rated Capacity / 800 MW (AC side) / 775 MW (AC side)
14 / Overload
Capacity / none
15 / HVDC
Overhead Line / N.A.
16 / HVDC Cable / 2x75 km submarine cable: 1000/1600 mm² Cu
2x90 km underground land cable: 2000 mm² Al
17 / Electrodes / N.A.
18 / Electrode Line / N.A.
21 / HVDC Valves / IGBT
22 / Valve Cooling / Offshore:water to sea water cooling
Onshore: water to air cooling
23 / Converter
Transformer / 3-phase, 3-winding; (590/ 590/ 200) MVA; 2 transformers in parallel
24 / Smoothing
Reactor /
Converter Reactor / 2 dry type reactors per station, 10 mH
6 dry type reactors per station, 35,9mH & 53,9mH
25 / Reactive Power
Compensation / No reactive compensation at HVDC platform;
Shunt reactors installed at AC platform (12MVA and 7MVA) / none
26 / AC Filters / none / none
27 / DC Filters / none / none
28 / Special Control / Offshore: V-f control, black Start.
Onshore: V o. Q-mode, emergency power control including DC chopper (breaking resistor)
29 / Power Co
30 / Manufacturer / ABB
31 / Commissioned / July. 2015
32 / Operator / TenneTOffshore GmbH
33 / Contact
Person / Dr. J. Jung

34 / Project
Description / The offshore wind farms Borkum West II, BorkumRiffgrund and MEG Offshore 1 are connected via ABB HVDC Light to the German 400kV transmission system.
The rating of the HVDC symmetrical monopole is 800 MW.
35 / Reference

36. GEOGRAPHICAL LOCATION:

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Project Name: DolWin1

Update: 16/06/2015

37. SINGLE LINE DIAGRAM

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Project Name: DolWin1

Update: 16/06/2015

38. REDUNDANCY AND SPARES DEFINITION

Definitions on equipment terms and energy availability are identical to those in CIGRE Protocol 14-90 WG 04.

The definitions used specifically in this questionnaire are as follows:

1 Redundancy

Redundancy exists, if a failure in the system concerned do not cause any decrease in energy availability.

Please answer yes or no to such redundancy.

If parts of the system have redundancy, please specify this on table 2.

2 Reserve systems

A fault in a system may cause unavailability only during a fairly short period after which full transmission capability

can be restored by taking a reserve system into service.

Please answer yes or no to the existence of such a system and state the time needed for the operation.

3 Spare Parts

Please answer yes or no in this field if the main components in the system can be replaced by spares disposed by your company.

Please fill in

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Project Name: DolWin1

Update: 16/06/2015

Code / Redundancy / Reserv System / Spare parts
Yes/No
1) / Yes/No
2) / Min. time
needed
for change
over (hours) / Yes/No
3) / Min. time
needed
to install spares
(hours)
AC Filter and Shunt Bank AC Switchyard Equipment AC Control and Protection Converter Transformer
Synchronous Compensator AC and Auxilliary Equipment / AC-E.F AC-E.SW AC-E.CP AC-E.TX AC-E.SC AC-E.AX / N.A.
Yes
Yes 1)
Yes
N.A.
Yes 1) / N.A.
Yes
Yes
No
N.A.
Yes
Valve Electrical
Valve Cooling (integral with valve) / V.E V.VC / Yes 1)
Yes 1) / Yes
Yes
Local HVDC Control and Protection Master HVDC Control and Protection Telecommunication / C-P.L C-P.M C-P.T / Yes 1)
Yes 1)
Yes / Yes
Yes
Yes
DC Filters
DC Switching Equipment
DC Ground Electrode
DC Ground Electrode line
Other DC Yard and Valve Hall Equipment / DC-E.F DC-E.SW DC-E.GE DC-E.EL DC-E.O / N.A.
No
N.A.
N.A.
No / N.A.
Yes
N.A.
N.A.
Yes
DC Transmission Line / TL / No / Yes

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Project Name: DolWin1

Update: 16/06/2015

BorWin2 HVDC System

TABLE 2

1 * Redundancy
AC-E.TXRedundant Converter Transformers on both sides
C-P.TRedundant control & protection systems
V.E.Each converter arm has redundant IGBT’s and associated equipment
V.VCValve cooling pumps and fans, measuring devices are redundant
AC-E.AXRedundant auxiliary power supplies
Redundant HVAC systems
1
2 * Reserv System
3 * Spare Parts
For all main equipment, excluding converter transformers, spare components are available. The converter transformer arrangement provides 100 % redundancy. Due to harsh environmental conditions at HVDC platforms several components are stored onshore in a central spare part building.

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