Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Tertiary Regulation of Cascaded Run-of-the-River Hydropower in the
  Islanded Renewable Power System Considering Multi-Timescale Dynamics   To enable power supply in rural areas and to exploit clean energy, fully
renewable power systems consisting of cascaded run-of-the-river hydropower and
volatile energies such as pv and wind are built around the world. In islanded
operation mode, the primary and secondary frequency control, i.e., hydro
governors and automatic generation control (AGC), are responsible for the
frequency stability. However, due to limited water storage capacity of
run-of-the-river hydropower and river dynamics constraints, without
coordination between the cascaded plants, the traditional AGC with fixed
participation factors cannot fully exploit the adjustability of cascaded
hydropower. When imbalances between the volatile energy and load occur, load
shedding can be inevitable. To address this issue, this paper proposes a
coordinated tertiary control approach by jointly considering power system
dynamics and the river dynamics that couples the cascaded hydropower plants.
The timescales of the power system and river dynamics are very different. To
unify the multi-timescale dynamics to establish a model predictive controller
that coordinates the cascaded plants, the relation between AGC parameters and
turbine discharge over a time interval is approximated by a data-based
second-order polynomial surrogate model. The cascaded plants are coordinated by
optimising AGC participation factors in a receding-horizon manner, and load
shedding is minimised. Simulation of a real-life system with real-time pv data
collected on site shows the proposed method significantly reduces load loss
under pv volatility.

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The categories of this paper are: plasm-ph
10
The categories of this paper are: q-bio
14
The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex
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The categories of this paper are: adap-org
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th
4
The categories of this paper are: cond-mat
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The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc
25
The categories of this paper are: patt-sol
24
The categories of this paper are: dg-ga
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The categories of this paper are: atom-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: stat
22
The categories of this paper are: chao-dyn