Consultation 2GW HVDC offshore grid connection system – Documentation

Future offshore wind turbines in the wind farm zone 'IJmuiden Ver' will be connected through 66 kV “inter-array” cables to an offshore 2000 MW AC/DC converterstation from TenneT. The offshore converterstation will be based on HVDC technology. Using 2 GW high voltage (525 kV) export cables the electricity is transported to shore where the DC is converted back to AC again.

To ensure the 2 GW standard has an optimal design from a system perspective TenneT has initiated a consultation process with relevant stakeholders on all relevant interfaces with offshore wind farm developers (OWFs). The documentation below contains the result of this consultation process. The consultation process itself is described in the first file: the concluding report. The position papers per topic include a more in-depth description and substantiation of the positions. 

NOTE:

The RVO website provides information about the tender and permit to develop IJmuiden Ver Wind Farm Zone (IJVWFS).

On offshorewind.rvo.nl you can find all available site data on soil, wind & water conditions and obstructions on IJVWFS 

Contact

General questions:

General questions can be submitted to netopzee@tennet.eu

01._Overview_topics_2_GW_consultation_process

ONL_TTB-05443_Overview_topics_2_GW_consultation_process.pdf (992 KB, pdf, 19/03/21)

This concluding report describes the consultation process and it contains the result: a summary of the consulted design options and the final positions on these topics. This report can be used as a reference work of the consultation process. To facilitate readers a summary of the position papers has been added per topic. These summaries are meant to aid in understanding the background of the positions but have not been aligned in the consultation process. The final positions for each topic stem directly from the position papers which have been established in collaboration with all participating stakeholders.

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02._2GW_HVDC_Grid_Design_and_Reliability_Availability

ONL_TTB-05415_T01_2GW_HVDC_Grid_Design_and_Reliability_Availability_v2.0.pdf (986 KB, pdf, 19/03/21)

This report describes several key design choices within this previously established framework for the IJmuiden Ver grid connection system.

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03._Grid_Code

ONL_TTB-05430_T02_Grid_Code_V3.0.pdf (468 KB, pdf, 19/03/21)

This position paper describes how TenneT deals with the implementation of the HVDC grid code.

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04._Reactive_Power_Strategy

ONL_TTB-05416_T03_Reactive_Power_Strategy_v2.0.pdf (620 KB, pdf, 19/03/21)

This position paper describes the distinction in support duties, for the reactive power compensation, by the offshore HVDC platform (TenneT) and the offshore wind farm

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05._Harmonics

ONL_TTB-05432_T04_Harmonics_V3.0.pdf (916 KB, pdf, 19/03/21)

This paper describes the position on how TenneT (will) deal with the harmonics on the offshore grid.

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06._Load_Rejection

ONL_TTB-05433_T05_Load_Rejection_v1.0.pdf (363 KB, pdf, 19/03/21)

This position paper describes these maximum voltage limits.

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07._OWF_Modelling_for_HVDC_System_Studies

ONL_TTB-05434_T06_OWF_Modelling_for_HVDC_System_Studies_V3.0.pdf (438 KB, pdf, 19/03/21)

This position paper describes the indicative planning based on an iterative approach to narrow the envelope of the offshore wind farm (OWF) data.

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08._Voltage_level_and_Frequency

ONL_TTB-05417_T07_Voltage_level_and_Frequency_v2.0.pdf (339 KB, pdf, 19/03/21)

This position paper describes the position of TenneT with regard to the voltage level and frequency of the offshore grid.

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09._Point_of_Common_Coupling_and_Grid_Connection_Point

ONL_TTB-05418_T08_Point_of_Common_Coupling_and_Grid_Connection_Point_v1.0.pdf (358 KB, pdf, 19/03/21)

The position paper indicates where the GCP and PCC are located.

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10._Control_and_Protection_design_66_kV

ONL_TTB-05437_T09_Control_and_Protection_design_66_kV_V2.0.pdf (457 KB, pdf, 19/03/21)

This position paper elaborates on the detailed aspects of the 66 kV switchyard of the converter platform.

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11._Dynamic_DC_cable_rating

ONL_TTB-05419_T10_Dynamic_DC_cable_rating_V2.0.pdf (467 KB, pdf, 19/03/21)

This paper describes TenneT’s strategy with regard to the export cable rating, which determines for example how much overplanting can be achieved.

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12._J-tubes_and_Number_of_Bays

ONL_TTB-05419_T11_J-tubes_and_Number_of_Bays_V3.0.pdf (455 KB, pdf, 19/03/21)

This paper describes the number of J-tubes and Gas-insulated Swithgear (GIS) bays

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13._Technical_interface_facilities_for_OWF

ONL_TTB-05440_T12_Technical_interface_facilities_for_OWF_V2.0.pdf (503 KB, pdf, 19/03/21)

This position paper describes the technical interfaces and the interface responsibilities between the OWF owners and TenneT. In addition, it defines the foreseen facilities for the OWF which are provided by TenneT, and it describes the responsibilities between TenneT and the OWF.

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T12_-_Appendix_B_--_Example_Field_Lay_Out_HKZ_Beta__1-10_.pdf (229 KB, pdf, 19/03/21)

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T12_-_Appendix_C_--_Example_Cable_Pulling_Methodology.pdf (630 KB, pdf, 19/03/21)

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14._Shared_Data_Services__MIVSP_

ONL_TTB-05578_T13_Shared_Data_Services__MIVSP__V1.0.pdf (683 KB, pdf, 19/03/21)

This paper describes TenneT's position on the number of sensors and interactions with RWS. Additionally, a clarification is provided of the services offered by RWS and how this will be made available to the OWF developers.

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15._Grid_Forming_OWF

ONL_TTB-05442_T14_Grid_Forming_OWF_v1.0.pdf (420 KB, pdf, 19/03/21)

This paper describes that the design basis for the Grid Connection System of IJmuiden Ver does not consider the presence of grid forming by wind turbine generators (WTGs) in IJmuiden Ver

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16._Metering

ONL_TTB-05443_T15_Metering_v1.0.pdf (338 KB, pdf, 19/03/21)

This paper describes the metering requirements for the inter-array for all PPMs that are connected to TenneT’s offshore substations.

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17._Cable_laying_configurations_and_availability

ONL_TTB-05579_T16_Cable_laying_configurations_and_availability_V3.0.pdf (961 KB, pdf, 19/03/21)

This paper describes the different cable laying configurations and their subsequent effect on availability.

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18._Fault_Ride_Through_Performance

ONL_TTB-05580_T17_Fault_Ride_Through_Performance_V1.0.pdf (366 KB, pdf, 19/03/21)

This paper describes suggestions for fault ride through (FRT) handling and further investigative steps to be taken regarding this subject.

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19._Offshore_testing_and_commissioning_with_OWF

I02_-_Appendix_A_-_Planning_offshore_testing_and_commissioning.pdf (13 KB, pdf, 19/03/21)

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ONL_TTB-05582_I02_Offshore_testing_and_commissioning_with_OWF_V3.0.pdf (872 KB, pdf, 19/03/21)

This paper describes the concluded position on the testing and commissioning schedule

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20._Helideck_and_access_to_platform

ONL_TTB-05583_I03_Helideck_and_access_to_platform_V1.0.pdf (360 KB, pdf, 19/03/21)

This paper describes the position on helideck and platform access

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21._Nature_inclusive_design

ONL_TTB-05454_I04_Nature_inclusive_design_V1.0.pdf (645 KB, pdf, 19/03/21)

This paper describes several ecology-friendly measures which can be integrated in the offshore grid design as a basic condition

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