Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Phase and amplitude synchronisation in power-grid frequency fluctuations
  in the Nordic Grid   Monitoring and modelling the power grid frequency is key to ensuring
stability in the electrical power system. Many tools exist to investigate the
detailed deterministic dynamics and especially the bulk behaviour of the
frequency. However, far less attention has been paid to its stochastic
properties, and there is a need for a cohesive framework that couples both
short-time scale fluctuations and bulk behaviour. Moreover, commonly assumed
uncorrelated stochastic noise is predominantly employed in modelling in energy
systems. In this publication, we examine the stochastic properties of six
synchronous power-grid frequency recording with high-temporal resolution of the
Nordic Grid from September 2013, focusing on the increments of the frequency
recordings. We show that these increments follow non-Gaussian statistics and
display spatial and temporal correlations. Furthermore, we report two different
physical synchronisation phenomena: a very short timescale phase
synchronisation ($<2\,$s) followed by a slightly larger timescale amplitude
synchronisation ($2\,$s-$5\,$s). Overall, these results provide guidance on how
to model fluctuations in power systems.

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The categories of this paper are: alg-geom
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The categories of this paper are: nucl-th
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The categories of this paper are: comp-gas
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The categories of this paper are: quant-ph
0
The categories of this paper are: hep-ph
10
The categories of this paper are: q-bio
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The categories of this paper are: atom-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: math-ph
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The categories of this paper are: econ
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The categories of this paper are: chem-ph
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The categories of this paper are: solv-int
30
The categories of this paper are: q-alg
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The categories of this paper are: hep-ex
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The categories of this paper are: hep-lat
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The categories of this paper are: astro-ph