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Abstract
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The financial value of security service provided by
dual-branch controller of a large-scale photovoltaic system (LPS)
has been investigated in this paper. To perform this task, it is nec-
essary to investigate the impact of LPS on small-signal stability of
power network. To study the impact and performance of LPS on
low-frequency oscillatory modes, a systematic scheme is developed
to achieve an accurate model of multi-machine power network in-
cluding of the LPS technology. A fully-described LPS model with
all network-relevant control functions will be obtained. The pro-
posed model has been then employed in the study of financial com-
pensation strategy of security service provided by the LPS con-
troller. The proposed compensationstrategyinthispaperisbased
on correlation of swing damping rate (SDR) criterion with genera-
tion cost (GC) criterion as dynamic and pecuniary indices, respec-
tively. A weighted sum of performance and robustness indices is
considered for SDR. The financial profit created by dual-branch
controller of LPS as ancillary service (AS) is evaluated by a two-
purpose optimization based on SDR and GC indices. The proposed
strategy is tested on a modified 6-machine 3-area power system.
Comprehensive discussion is provided to describe the performance
of the presented method.
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