Abstract:
The P V F or P V 2F double droop control is
commended for its ability to regulate both the dc voltage and
frequency in a decentralized approach. However, a convincing
response is not achieved due to an interaction between the droop
characteristics of dc voltage and frequency. This interaction
affects the dc voltage and frequency support of the AC system
surrounded the Multi-Terminal HVDC (AC-MTDC) grid. To
overcome this effect a interaction less Duo control strategy is
proposed in this paper, which takes the advantage of a Bi-polar
Voltage Source Converter (B-VSC) topology in the MTDC grid.
The virtue of the proposed control technique is emphasized by
comparing it with the existing P V 2F double droop control along
with two case studies. The validation of interaction less Duo
control strategy is carried out on five terminal CIGRE DC grid
benchmark model integrated into two area power system, which
is simulated in PSCAD/EMTDC software.
