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<field name="value">Sierra Garcia, Jesús Enrique</field>
<field name="authority">737</field>
<field name="confidence">600</field>
<field name="orcid_id">0000-0001-6088-9954</field>
<field name="value">Santos, Matilde</field>
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<field name="value">Pandit, Ravi</field>
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<field name="value">2023-02-08T09:23:28Z</field>
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<field name="value">2023-02-08T09:23:28Z</field>
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<field name="value">2022-05</field>
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<field name="value">0952-1976</field>
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<field name="value">10.1016/j.engappai.2022.104769</field>
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<field name="value">Wind turbine (WT) pitch control is a challenging issue due to the non-linearities of the wind device and its&#xd;
complex dynamics, the coupling of the variables and the uncertainty of the environment. Reinforcement learn-&#xd;
ing (RL) based control arises as a promising technique to address these problems. However, its applicability&#xd;
is still limited due to the slowness of the learning process. To help alleviate this drawback, in this work we&#xd;
present a hybrid RL-based control that combines a RL-based controller with a proportional–integral–derivative&#xd;
(PID) regulator, and a learning observer. The PID is beneficial during the first training episodes as the RL based&#xd;
control does not have any experience to learn from. The learning observer oversees the learning process by&#xd;
adjusting the exploration rate and the exploration window in order to reduce the oscillations during the training&#xd;
and improve convergence. Simulation experiments on a small real WT show how the learning significantly&#xd;
improves with this control architecture, speeding up the learning convergence up to 37%, and increasing the&#xd;
efficiency of the intelligent control strategy. The best hybrid controller reduces the error of the output power&#xd;
by around 41% regarding a PID regulator. Moreover, the proposed intelligent hybrid control configuration has&#xd;
proved more efficient than a fuzzy controller and a neuro-control strategy.</field>
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<element name="sponsorship">
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<field name="value">This work was partially supported by the Spanish Ministry of Sci- ence, Innovation and Universities under MCI/AEI/FEDER Project num- ber RTI2018-094902-B-C21.</field>
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<field name="value">eng</field>
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<field name="value">Engineering Applications of Artificial Intelligence. 2022, V. 111, 104769</field>
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<field name="value">https://doi.org/10.1016/j.engappai.2022.104769</field>
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<field name="value">info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/RTI2018-094902-B-C21/ES/ANALISIS Y CONTROL DE UN DISPOSITIVO FLOTANTE HIBRIDO DE ENERGIA EOLICA Y MARINA/</field>
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<field name="value">Intelligent control</field>
<field name="value">Reinforcement learning</field>
<field name="value">Learning observer</field>
<field name="value">Pitch control</field>
<field name="value">Wind turbines</field>
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<field name="value">Wind turbine pitch reinforcement learning control improved by PID regulator and learning observer</field>
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<field name="value">Engineering Applications of Artificial Intelligence</field>
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<field name="value">111</field>
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