Kriegers Flak -Combined Grid Solution

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Krigers Flak CGS er en 400 MW forbindelse mellem Danmark og Tyskland

Per Obbekjær og Ole Stig Nissen februar 2022

Kriegers Flak - Combined Grid Solution

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TEKNISKE FAKTA

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Krigers Flak CGS er en 400 MW forbindelse mellem Danmark og Tyskland.

Anlægget inkluderer:

• En BtB HVDC VSC konverter i Bentwisch inklusive tilslutningsfelter

• 2x24 km 150 kV søkabel mellem Danmark og Tyskland

• 220 kV elektrisk filter i station Bjæverskov

• En 60-120 Mvar reaktor i station Bjæverskov

• KFE offshore platform med plads til 150/220 kV transformer, 150 og 220 kV

tilslutningsfelter (samt forberedelse for et 150 kV tilslutningsfelter til Sverige)

Der er implementeret Dynamic Line Rating på 220 kV søkablerne i forbindelse med

Kriegers Flak indføringsprojektet i Danmark.

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Germany Denmark

OSS Baltic 2 Extension

Substation Bentwisch (BW)

OSS KFB

Extension OSS KFE

Gravity Base Foundation

Cable 1 Sea Cable 2 Sea Substation

BJ Extens.

~‒ ~ ‒

Substation Bjaeverskov (BJ)

Back-to-Back Converter Station Offshore Substation

Kriegers Flak Extension (KFE)

Sea Cables

Offshore Substation Baltic 2

Sub-Project Sub-Project Sub-Project

Substation BW Extens.

24 km

410 MW

Tendering

Offshore installation / onshore construction Testing on site / commissioning

✓

Ready for operation Engineering / production Scope or project works Existing assets

Updated status

Civil Building Converter Hall

Converter Components

MIO Master Controller

✓

✓ ✓ ✓

✓

✓ ✓

✓

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Projektet – Forløbet i korte træk

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Projektet blev gennemført i samarbejde med det tyske energiselskab 50Hertz.

Opgaven blev sendt i EU udbudt i 2015.

Der var tale om tre hovedentrepriser:

1. KFE offshore platform - som gik til Ho Landia i Holland 2. 2x24 km 150 kV søkabel – som gik til NKT

3. BtB HVDC VSC konverter i Bentwisch - som gik til ABB (Nu Hitachi Energy)

Idriftsættelse af forbindelsen skete den 30 juni 2021, i forbindelse med overtagelsen af

konverter stationen i Bentwisch (to et halvt år senere end det som blev planlagt tilbage i

2015)

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Konverter stationen i Bentwitsch

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KFE Platformen på Krigers Flak

KFE platformen er vist i det rødt indrammede - den øvrige del af platformen er benævnt KFB tilknyttet det danske i- landføringsanlæg for vindmøllerne på Krigers Flak

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Søkablet fra KFE til Baltic 2

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Link til film og billeder

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6 juli 2021 Markering af Overtagelsen af BtB

stationen i Bentwisch 1. Markeringen af linjens åbning

- Eröffnungsfilm Combined Grid Solution - CGS Inauguration - YouTube

2. Projektet kort fortalt

- Kriegers Flak Combined Grid Solution - English subtitles–YouTube

3. Stationen i Bentwitsch set fra en drone

- Drone Photos 20191210 - Google Drev

4. Transformeren ankommer til Bentwisch

- Transformer transport to 50Hertz substation Bentwisch near Rostock - YouTube

5. Hol Landia præsentation omkring bygning af platforme - Combined Grid Solution: Kriegers Flak –YouTube

6. Jan de Nul præsentation vedrørende bygning af fundamenter til platforme - Jan De Nul Group - Kriegers Flak (Denmark) - YouTube

7. NKT præsentation vedrørende kabelproduktion og kabellægning til søs - Combined grid solution for Kriegers Flak wind farm - YouTube

8. Hitachi/ABB præsentation vedrørende HVDC –ikke projekt specifik for krigers Flak - Hitachi's HVDC (High Voltage Direct Current) System - YouTube

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Afrunding

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6 juli 2021 Markering af Overtagelsen af BtB

stationen i Bentwisch

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28 October 2019 KF CGS - CSC Meeting No 31 11

Back Up Slides

Præsentation omkring KF CGS BtB projektet

gennemført i Bryssel den 4 februar 2020

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Kriegers Flak

- Combined Grid Solution KF CGS

04/02/2020 EC Workshop: Horizon 2050 power system and the role of HVDC technologies in Brussels

https://youtu.be/64h8MrR9zVU

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Ole Stig Nissen, Energinet, Denmark

Sebastian Wagner, 50Hertz Transmission, Germany

Kriegers Flak

- Combined Grid Solution KF CGS

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EC Workshop: Horizon 2050 power system and the role of HVDC technologies in a highly decentralised RES generation - Brussels, 4 February 2020

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Denmark

Energinet National Control Center Center

Germany

50Hertz Transmission Control Center

Center MIO Mastercontroller for

Interconnector Operation

Green – existing and newly built KF AC infrastructure Energinet Red – KF CGS Blue – existing OWP infrastructure 50Hertz Back to Back Converter Sea Cables

OSS KFE SS Extension

A common project of German TSO 50Hertz and Danish TSO Energinet, co-financed by the European Energy Program for Recovery (EU)

First hybrid interconnector/OWP system in the world - It combines:

• the radial grid connections of the German OWPs Baltic 1 & 2 and the Danish OWP Kriegers Flak with

• a cross-border interconnector between Denmark and Germany, connecting the German north- eastern region with the Danish area of Sjaelland

• controlled by MIO – a new kind of calculation and control system securing optimization of available capacities and flows of this complex system.

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Energy transport

Business as usual – Offshore wind to land – high wind scenario

04/02/2020 EC Workshop: Horizon 2050 power system and 15 the role of HVDC technologies in Brussels

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Energy transport

Interconnector – Offshore wind to land – high wind scenario

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Energy transport

Interconnector – Offshore wind to land – high wind scenario

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Energy transport

Land to Offshore – then Offshore to land – Low/No wind scenario

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Energy transport

Land to Offshore – then Offshore to land – Low/No wind scenario

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Kriegers Flak CGS – Electrical System Assets

20 KFA

KFB

KFE BAZ BAE

220/150kV BwW 450MVA

380kV/150kV/30kV 400MVA

HVDC

BwC Possible extension

towards Sweden BJS220

Bjæverskov 400 kV Ishøj 400 kV

KFA: 200MW KFB: 400MW

Baltic 2: 288MW

RA4

Baltic 1: 48MW TA1

TA2

RA1 RA3

RA2

TA3

RKFA

CB01

Busbar A Busbar B PST

9 km 80 km

80 km 34 km

25 km 60 km

75 km

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KF CGS Offshore Parts – OSS extension module KFE and Sea Cables

21 KF CGS sea cables route

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EPCI for two AC sea cables connecting OSS Ba2 with OSS KFE

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EPCI for the HVAC offshore platform

„KFE“ as extension of Kriegers Flak OSS KFB

Offshore platform KFB (installed in 2018) connects the Kriegers Flak wind park to the Danish onshore grid.

The KFB platform is combined with the extension module KFE on one gravity base foundation.

Main components on KFE: transformer (connecting point of the German with the Danish side) and switchgear.

Baltic 2 Platform: Existing and already operating.

Connecting the Baltic 2 wind park to the German onshore grid.

One of the two KF CGS AC sea cables (150kV) during installation campaign in front of KFBE platform.

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KF CGS Onshore Part - The Back to Back Converter in Bentwisch

What it do

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• The Danish and the German transmission grids operate in different phase, which makes a transformation AC – DC – AC necessary.

• The so called back-to-back converter (BtB) - consists of two voltage source converters (VSC) – which change the AC of the Nordic synchronous area into DC and directly back to AC, now adapted to the European synchronous area.

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KF CGS Onshore Part - The Back to Back Converter in Bentwisch

How the site looks today

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KF CGS Onshore Part - The Back to Back Converter in Bentwisch

How the side is structured

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KF CGS Onshore Part - The Back to Back Converter in Bentwisch

Electrical System Assets

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Kriegers Flak CGS

The MIO (Master Controller for Interconnector Operation)

KF CGS is the first interconnector between two countries (and bidding zones) that integrates infeed from two different national wind farms.

A new kind of calculation and control system is developed to control available capacities and flows of such a complex system.

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Tasks of the MIO:

1. Calculating capacity for the market 2. Meet market results at POS

3. Avoid overload of equipment

4. Keep voltage limits for BtB and wind farms

1. Calculating capacity for the market

• Taking foreseen topology, equipment ratings and wind forecasts into consideration

1. Calculating capacity for the market

• Taking foreseen topology, equipment ratings and wind forecasts into consideration

2. • In case of wind forecast errors corrections needed

• Wind

3. Avoid overload of equipment

• In case of equipment trips and forecast errors

• Limitation of

Control (EPC) operation

4.

•

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Acknowledgements

The Kriegers Flak Combined Grid Solution is granted with financial support from the European Energy Programme for Recovery (EEPR) of the European Union

Status

• OSS extension module KFE and Sea Cables was tested back in 2019

• BtB substation were energized on January 30th 2020

• Fist transmission test is scheduled for week 9, 2020

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