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B4-71 Application guide for the insulation coordination of Voltage Source Converter HVDC (VSC HVDC) stations

HVDC VSC technology is spreading since its first application in 1997. It is predicted by the industry that it will expand even further, mainly because of the increased need for interconnectors and to integrate new renewable energy sources (e.g. off shore wind) and the conversion of ac lines to dc lines as well as its advantages compared to LCC HVDC technologies, such as better ac voltage and reactive power support and controllability.

Presently, there is no industrial guideline to address the insulation coordination aspect for equipment in VSC HVDC stations. It is necessary to initiate this task, similarly to the approach that was taken in the early days of the LCC technology. The objective of this WG is not to expose any VSC HVDC converter design secrets but more to study and define what faults shall be considered for the insulation coordination design of VSC HVDC stations. There are a number of converter topologies/types that can apply to a VSC converter. Some topologies such as the two and three level converters were used in the early VSC HVDC systems. However, since the introduction of the multilevel converter, VSC converter stations utilize the multilevel converter. Therefore not all types of VSC converters will be studied. The focus will be placed on modular multilevel converters. Both half-bridge and full-bridge configurations will be considered.

The scope of this WG will be limited to the VSC HVDC stations and will not cover insulation coordination of the ac network, HVDC cables or the HVDC overhead lines. However, the faults conditions that may impact both cables and overhead lines will be identified. The results will be shared with SC B1 and SC B2.

A key point for the insulation coordination is a good understanding of the over-voltages taking place in the converter stations caused by different events (faults both internal and external, blocking, etc.)

Terms of Reference (pdf, 127kB)

Members:

Members:

NAMEGIVEN NAMECOUNTRY NAME
MohaddesMojtabaCanada
RamAdapaUnited states
KamranSharifabadiNorway
BrunoBisewskiCanada
TakuNodaJapan
HaniSaadFrance
ThavenesenGovenderSouth Africa
KeriPicksterSouth Africa
SebastianSuchanekGermany
TimoChristGermany
Jerome MathotBelgium
Damien Fonteyne United Kingdom
Kamal Siriwardhana United Kingdom
Davor Vujatovic United Kingdom
DharshanaMuthumuniCanada
EtienneVeilleiuxCanada
Mattia PazienzaItaly
MikhailSamborskyGermany
PabloAlbi PerezSpain
YangtaoYangNorway
SiavashZoroofiCanada
KanstantsinFadzeyeuSweden
JohnGleadowAustralia
ArashDarbandiCanada
BagirOzumTurkey
AmitKumarIndia
MaryamSalimiCanada