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Big Data Cogn. Comput. 2018, 2(4), 36; https://doi.org/10.3390/bdcc2040036

A Model Free Control Based on Machine Learning for Energy Converters in an Array

1
Ångströmlaboratoriet, Division of Electricity, Uppsala University, Lägerhyddsvägen 1, 75237 Uppsala, Sweden
2
School of Engineering, University of Plymouth, Drake Circuit, Plymouth PL4 8AA, UK
*
Author to whom correspondence should be addressed.
Received: 22 October 2018 / Revised: 13 November 2018 / Accepted: 18 November 2018 / Published: 22 November 2018
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Abstract

This paper introduces a machine learning based control strategy for energy converter arrays designed to work under realistic conditions where the optimal control parameter can not be obtained analytically. The control strategy neither relies on a mathematical model, nor does it need a priori information about the energy medium. Therefore several identical energy converters are arranged so that they are affected simultaneously by the energy medium. Each device uses a different control strategy, of which at least one has to be the machine learning approach presented in this paper. During operation all energy converters record the absorbed power and control output; the machine learning device gets the data from the converter with the highest power absorption and so learns the best performing control strategy for each situation. Consequently, the overall network has a better overall performance than each individual strategy. This concept is evaluated for wave energy converters (WECs) with numerical simulations and experiments with physical scale models in a wave tank. In the first of two numerical simulations, the learnable WEC works in an array with four WECs applying a constant damping factor. In the second simulation, two learnable WECs were learning with each other. It showed that in the first test the WEC was able to absorb as much as the best constant damping WEC, while in the second run it could absorb even slightly more. During the physical model test, the ANN showed its ability to select the better of two possible damping coefficients based on real world input data. View Full-Text
Keywords: machine learning; wave energy; power take-off; artificial neural network; wave tank test; physical scale model; floating point absorber; damping; control; collaborative machine learning; wave energy; power take-off; artificial neural network; wave tank test; physical scale model; floating point absorber; damping; control; collaborative
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Thomas, S.; Giassi, M.; Eriksson, M.; Göteman, M.; Isberg, J.; Ransley, E.; Hann, M.; Engström, J. A Model Free Control Based on Machine Learning for Energy Converters in an Array. Big Data Cogn. Comput. 2018, 2, 36.

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Big Data Cogn. Comput. EISSN 2504-2289 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
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