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Standards Development
The document serves as a specification for the joint commissioning of grid-connection of offshore wind farms using the voltage source converter based high voltage direct current (VSC -HVDC) transmission system. The document provides the technical specification on the commissioning precondition, objectives, pr ocedures, items, methods and requirements of grid-connection of offshore wind farms using the VSC-HVDC transmission, particularly focusing on the special test items of offshore wind farms. This specification covers the offshore wind farms commissioning, coordination commissioning for transmission, coordination testing for DC braking chopper, as well as special items.However the conventional commissioning and testing items of VSC-HVDC system are out of scope.
Due to the advantages of abundant and highly qualified wind resources, the offshore wind farms have become the development trend of wind power generation. According to the data issued by International Ocean Renewable Energy Action Coalition (OREAC), the total installation capacity of offshore wind farms would reach to 1400 GW by 2050.
Currently, the VSC-HVDC transmission technology provides a solution for grid connection of the large scaled and long distance offshore wind power farms, since it can achieve power supply for passive system, long distance power transmission, flexible and independent control for active and reactive power. In this context, a number of large scaled and long distance wind power farms, connected with power gird using VSC -HVDC transmission, have been put into commercial operation around the world, such as China, Germany, and UK.
For example,the projects BorWin2 and HelWin1 have been put into operation in Germany since 2015, which both apply VSC-HVDC technology to connect offshore wind power farms into the German AC system. BorWin2 and HelWin1 are operated at DC transmission voltages of ±300 kV and ±250 kV, respectively.
More and more offshore wind farms would be integrated into the onshore AC power grid using VSC -HVDC transmission. The commissioning is the final on-site test for grid-connection of offshore wind farms using VSC-HVDC transmission, to help ensure that the whole system can safely and reliably operate, and meet the grid connection requirements, as well as the relevant contracts and specifications.
Compared with the commissioning of conventional VSC-HVDC projects, the joint commissioning procedures, methods and grid-connection requirements of the VSC-HVDC projects with integration of offshore wind farms are different, due to the special offshore operating conditions, as well as the existence of onshore DC braking chopper and the offshore wind farms. Therefore, it is necessary to draft a technical specification on joint commissioning for grid-connection of offshore wind farms using VSC-HVDC transmission.
The objective of this document is to elaborate the commissioning procedure s, items, conditions, methods and special requirements of grid-connection of offshore wind farms, to help ensure the integrity and correctness of the commissioning.The document may not be applicable to all projects, but represent a range of possible system tests which should be considered. For specific projects, extra commissioning requirements not included in this specification can be considered according to the agreement between the owner and suppliers.
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