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B4.64 Impact of AC System Characteristics on the Performance of HVDC schemes

A well established practice within the HVDC industry is to use Short Circuit Ratio (SCR) and Equivalent Short Circuit Ratio (ESCR) as a rapid assessment of whether a given rating of converter can be utilised when connected to an AC system with a certain Short Circuit Level (SCL). However, in recent years there have been new developments in technology, both of the generators and HVDC converters. For example the generators in a typical wind farms will provide a very low SCL, but are active devices and are capable of voltage support. New HVDC technologies, such as Capacitor Commutated Converters (CCC) and Voltage Sourced Converters (VSC) HVDC may be able to operate at a lower SCR, and VSC HVDC can also actively provide voltage support for the ac network, within rating and control limits. The presence in the ac networks of many HVDC converters of potentially different technologies or Flexible AC Transmission components such as STATCOM’s and series compensation, in close electrical proximity, affect the characteristics of the network.

Against this background the usability of SCR and ESCR as a simple tool for stability assessment of new HVDC schemes needs to be re-assessed.

The proposed Technical Brochure (TB) would present simple time domain transient analysis models which relate the simple SCR / ESCR assessment to the observed results. The conclusion of the TB would be how SCR / ESCR should be applied today or, if it is judged by the WG that these simple assessments are no longer suitable, an alternative assessment method will be proposed.

Terms of reference (pdf, 63kB)

WG members:

NAMEGIVEN NAMECountry name
BarkerCarlRoyaume Uni - United Kingdom
MakinoYoshiJapan
JovcicDraganRoyaume Uni - United Kingdom
PreeceRobinRoyaume Uni - United Kingdom
KarawitaChandanaCanada
ZhangYiCanada
SaidHumudCanada
ZhouJennyCanada
IravaniRezaCanada
AbedNagyUSA
ChaudhuriNilanjanUSA
Longàs ViejoCarmenSpain
CanelhasAndreRoyaume Uni - United Kingdom
AdamczykAndrzejRoyaume Uni - United Kingdom
JangGilsooSouth Korea
MalalaVincentRoyaume Uni - United Kingdom
GrahamJohnBrazil
CarvalhoAntonioBrazil
KosmeckiMichalPoland
SegerqvistIngerSweden
LozinovaNatalyaRussia
KilterJakoFinland
BeertenJefBelgium
ManchanManfredNambia
AbsolonGeorgGermany
ChaudhryAdnanGermany
de GraaffRoaldNetherlands
Yohannes AssefaHanaNorway
RicardoAntonioBrazil
FernandoIoniCanada
EnricSánchezSpain