|Network Code on High Voltage Direct Current Connections (HVDC)|
Network Code on High Voltage Direct Current Connections (HVDC) means the Commission Regulation (EU) 2016/1447 of 26 August 2016 establishing a network code on requirements for grid connection of high voltage direct current systems and direct current-connected power park modules, which is binding and directly applicable in all EU Member States.
High-Voltage Direct Current and High-Voltage Alternating Current (HVAC) interconnectors - comparison
Differences between HVDC and High-Voltage Alternating Current (HVAC) interconnectors are particularly visible when calculating benchmarks for cross-zonal capacities, where HVDC interconnectors perform better than the HVAC ones.
ACER/CEER Annual Report on the Results of Monitoring the Internal Electricity and Gas Markets in 2016 (Electricity Wholesale Markets Volume, October 2017, p. 22, 29) underlines that in the case of HVDC interconnectors the cross-zonal capacity is assumed to be equal to the thermal capacity of the interconnector, since HVDC interconnectors are virtually unaffected by the factors that impact available cross-zonal capacity on their HVAC counterparts.
In the case of HVAC interconnectors, there are also other elements limiting the capacity that can be offered to the market.
HVDC interconnectors are not impacted by unscheduled flows (composed of Loop Flows (LFs), along with the unscheduled allocated flows (UAFs)).
HVDC interconnectors, moreover, are usually not considered in the N-1 assessment.
ENTSO-E non-binding guidance on HVDC
Under Article 75 of the HVDC ENTSO-E has the power to issue non-binding guidance on HVDC (Implementation Guidance Document - IGD).
The main objective of the implementation guidance is to support system operators in the process of determination on national level of non-exhaustive requirements during the national implementation.
Non-exhaustive requirements are those for which the European level network codes do not contain all the information or parameters necessary to apply the requirements immediately and need further national specifications for its entire application in general on national level or as a site-specific choice.
Non-exhaustive requirements of the HVDC are listed in the ENTSO-E Guidance document for national implementation for network codes on grid connection, Parameters of Non-exhaustive requirements, Draft for consultation 1 July -15 August 2016, 22 June 2016, p. 18 - 24.
Further objectives of the IGDs are:
- to facilitate a common understanding of technical issues specified in the connection network codes, in context of new technologies and new requirements (e.g. synthetic inertia),
- to deliver broader explanations and background information and to illustrate interactions between requirements,
- to recommend coordination/collaboration between network operators (TSO) where either explicitly required by the connection codes or reasonably exercised from a system engineering perspective,
- to give guidance to national specifications for non-exhaustive requirements, and
- to express the need of further harmonisation beyond what is requested by the connection network codes when reasonable from a system engineering perspective (see: Connection Network Codes – Introduction to the public consultation of Implementation Guidance Documents, Introduction, 30 June 2016).
Commission Regulation (EU) 2016/1447 of 26 August 2016 establishing a network code on requirements for grid connection of high voltage direct current systems and direct current-connected power park modules
ENTSO-E Guidance document for national implementation for network codes on grid connection, Parameters of Non-exhaustive requirements, Draft for consultation 1 July -15 August 2016, 22 June 2016, p. 18 - 24
|Last Updated on Saturday, 15 December 2018 22:48|