ABB Sp. z o.o. , Warsaw

Aleksander Gul , PhD. Eng.

CIGRE memeber , SEP expert

HIGH POWER WIND FARMS ON BALTIC SEA : POWER TRANSFER ; HVAC and HVDC CABLE NETWORK PROTECTION

May 21, 2019 Slide 2

400 kV

275 kV

220 kV

[source : Electricity Ten Year Statement 2015, Appendix E, Technology]

HVAC submarine cables length and load limits

HVDC submarine cables load limits

[source : Electricity Ten Year Statement 2015,

Appendix E, Technology]

Limited length and load of HVAC submarine cables , required for power transfer from Offshore Station in to Onshore Station , main reason for use of HVDC Technology ( two Converter HVDC Stations , one on the offshore platform , second on the land ).

three cores

single core

May 21, 2019 Slide 3

Illustrative diagram of the

HVAC Collector Substation with

power 1600MVA , cintained four

400 MVA / 220kV / 66kV transfor-

mers , located on a separate

Offshore Platform

HVDC Converter Station,

1000 MW on land

HVDC Converter Station,

1000 MW, powered from the side

of the Collector Substation through

GIS 220kV , located in a separate

Offshore Platform

220kV, AC

400kV AC, National

Grid Station

GIS Type

ELK-14

HVDC +/- 320kV sea cables

220kV, AC

Sea cables , AC 220 kV

GIS Type

ELK-14

GIS Type

ELK-04

66 kV, AC

3 4

Power Transformer Factory in Lodz , Poland

Example : six offshore step-up Power Transformers 270 MVA/66 kV/220 kVforeseeing for fixing inside the housing of single platform , with totalpower of transformer group : 1620 MVA . Units delivered within Q1/2019 from from ABB Sp. z o.o. - factory in Lodz , Poland . This Fctory alreadydelivered 50 units of Offshore Power Transformers based on TrafoStar™ technology - cooomon for all ABB Power Transformer Factories

Offshore Power Transformes : plug-inn cable connectors on LV (66 kV) and HV (220 kV) side

May 21, 2019 Slide 4

Device measure content of : 9 different gasesand water in oil type CoreSense

M

‒Monitorowanie izolacji‒Inteligentne sterowanie układem chłodzenia

CoreTec system monitoredkey functions :

1) insulation wear forecast

2) intelligent control of the cooling system

Sensors group for integration wit the CoreTecsystem

Example of screen : Power Transformer monitoring , in case applicationof : CoreSense ; CoreTec ; measurement sensors from ABB , important for safety and prediction of operating time , i.e. time to transformer main-tenace .

May 21, 2019 Slide 5

Illustrative diagram of the

HVAC Collector Substation with

power 1600MVA , cintained four

400 MVA / 220kV / 66kV transfor-

mers , located on a separate

Offshore Platform

HVDC Converter Station,

1000 MW on land

HVDC Converter Station,

1000 MW, powered from the side

of the Collector Substation through

GIS 220kV , located in a separate

Offshore Platform

220kV, AC

400kV AC, National

Grid Station

GIS Type

ELK-14

HVDC +/- 320kV sea cables

220kV, AC

Sea cables , AC 220 kV

GIS Type

ELK-14

GIS Type

ELK-04

66 kV, AC

1 32 4 6 7

8 9 107

6

4

5

13

GIS panel 220 kV

type ELK-14 ,

configuration see

illustrative

diagram of HVAC

Collector Station

GIS High Current panel 72,5 kV type ELK-04 ,

(4000 A /63 kA) , energized transformer

400 MVA , see Illustrative diagram ( 9 cables

66 kV connected to GIS cale compartments )

GIS manufactured by ABB for voltages : 72,5 kV ; 220 kV ; 400 kV has very good referencesdue to long term exploitation in harsh ambient conditions (high humidity and salinity)

GIS panels 400 kV type ELK-3 , inside platform

cigre – statistics

MTBF= 1780 Years !

620.000 Years( No. of ELK-04

Bays x Yearsin service )

MTBF – Mean Time Between Failures in case GIS Type ELK-04 : 1780 Years ( acc. cigre for GIS delivered on global market from different manufacturers MTBF : 280 Years ) important due to reduction of maintenace cost , extremelly important in case Offshore HVAC Stations.

May 21, 2019 Slide 7

Circuit Breakers Drives type HMB…, installed in GIS 66-1200kV – RELIABILITY. Experience over 650.000 years / number of breakers x operation period /

302

31

238

294

31 250

50

100

150

200

250

300

350

ABB HMB-1/2 Mechanisms

Cigre Hydraulic Mechanisms

<200kV

Cigre Spring Mechanisms

<200kV

ABB HMB-4/8 Mechanisms

Cigre Hydraulic Mechanisms

>200kV

Cigre Spring Mechanisms

>200kV

MT

BF

(Y

ears

)

Mechanism Type

MTBF - Maine

Time Between

Failures

MTBF – Mean Time Between Failures in case hydraulic-spring operating mechanismof Circuit Breaker Type HMB… , installed in GIS Type ELK-04 ; ELK-14 ; ELK-3 : 300 Years ( drive well proven in ambient with high humidity and salinity )

Mean

May 21, 2019 Slide 8

Unigue Hybrid HVDC Circuit Breaker (320 kV/2000A , DC) , designed by ABB for protection of +/- 320 kV network system , basic components .

Planned locations of Offshore Wind Farm Complexes on the Baltic Sea , with powercapacity power value 11,2 GW and four HVDC Converter Stations (power value 0,88-1,4 GW!) [source: “Towards a Baltic Offshore Grid : Connecting Electricity Markets Through OffshoreWind Farms”, PreFeasibility Studies Report , September 2018 , Interreg Baltic Sea Region , European Regional Development Fund]

Interruptingof short circuitDC current , summarytime :

< 5,0 ms

May 21, 2019 Slide 9

G

3,3kV

3,3kV

66kV

„STRING” 66kV „STRING” 66kV

3,3kV

Module CP04

GIS type ELK-04 H

1

2

Transformer WindSTAR

Sn =12MVA

Un = 66kV/3,3kV

2

1

3

4

1

2

Diameter ca. 6,0 m

10 MW

ELK-04 H

„STRING” 66kV

ZnO

ZnO

„STRING” 66kV

„STRING” 66kV

Transformer

WindSTAR

Innovative devices manufac-tured by ABB , designed for Power Transfer from the Wind Turbines with powervalue : 8 or 10 MW, connectedto the 66 kV subsea cables in “STRING” :

1- step-up transformer 66 kV/3,3 kV /12 MVA typeWindSTAR with a biode-gradable insulation liquid, instead mineral oil ;

2- bay of 66 kV GIS typeELK-04 H ,

3- voltage sensors (U) in the CP04 Module ( digital executionof bay type ELK-04 H ) ;

4- current sensors (I) in the CP04 Module - Rogovsky coils( digital execution of baytype ELK-04 H)

GIS Type ELK-04 has verygood references in Poland , including Polish Power GridCpmpany ( PSE ) , Utilitesand Power Plants , over250 panels in exploitationsince 20 years

3

View of the „STRING”

1

2