Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Predictability of Power Grid Frequency   The power grid frequency is the central observable in power system control,
as it measures the balance of electrical supply and demand. A reliable
frequency forecast can facilitate rapid control actions and may thus greatly
improve power system stability. Here, we develop a weighted-nearest-neighbor
(WNN) predictor to investigate how predictable the frequency trajectories are.
Our forecasts for up to one hour are more precise than averaged daily profiles
and could increase the efficiency of frequency control actions. Furthermore, we
gain an increased understanding of the specific properties of different
synchronous areas by interpreting the optimal prediction parameters (number of
nearest neighbors, the prediction horizon, etc.) in terms of the physical
system. Finally, prediction errors indicate the occurrence of exceptional
external perturbations. Overall, we provide a diagnostics tool and an accurate
predictor of the power grid frequency time series, allowing better
understanding of the underlying dynamics.

4
The categories of this paper are: cond-mat
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The categories of this paper are: cmp-lg
13
The categories of this paper are: quant-ph
27
The categories of this paper are: comp-gas
2
The categories of this paper are: math
18
The categories of this paper are: econ
30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
21
The categories of this paper are: adap-org
34
The categories of this paper are: chem-ph
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The categories of this paper are: hep-ex
32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
31
The categories of this paper are: ao-sci