Abstract:
Frequency Support (FS) through the Multi-Terminal
HVDC (MTDC) grids is become obligatory by most of the
Transmission System Operators (TSOs). Providing this support
without any communication between converter stations is challenging. In the literature, researchers try to obtain the FS from
the dc grid in a communication-free manner to improve the
stability and reliability of the AC surrounded MTDC (ACMTDC) grids. Moreover, in most of the literature, based upon the
test system considered, the researchers have adopted a suitable
control scheme. However, a study of various communicationfree based FS control schemes and comparison among them are
unavailable in the literature, which is the subject matter of this
paper. Further, to conclude the various frequency supporting
control methodologies, simulation of two case studies have been
carried out with three schemes in PSCAD/EMTDC software.
The conclusion is drawn based upon the simulation results and
comparative study.
