FCR Provisions by Multi-Terminal HVDC System
semanticscholar(2021)
摘要
Frequency control is considered to be an important function
of multi-terminal HVDC (MTDC) systems. Sharing frequency containment reserves
(FCRs) among interconnected AC systems using flexible HVDC technology is
particularly attractive in the European context. However, coordination of the
contribution between systems with different sizes, quality requirements and dynamic characteristics requires harmonized rules and well-defined control
strategies. If the controllers are not properly designed, they can lead to
disproportional supports, noncompliance with the existing regulation framework,
or even degradation of the frequency quality. This paper analyzes several frequency
control solutions for MTDC systems in terms of the adequacy of the expected
contribution to the frequency containment process. The performance analyses are
then confirmed using load-frequency models coupled with a three-terminal DC
system. It is revealed that certain control solutions result in insufficient performance
with respect to the desired FCR provision. The proposed distributed solution
for each pair of converters can be the most compliant with the existing
framework while keeping the highest degrees of freedom.
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