A Comparative Analysis of Linear and Nonlinear Control of Wave Energy Converter for a Force Control Application

The aim of wave energy converters (WECs) is to harvest the energy from the ocean waves and convert into electricity. Optimizing the generator output is a vital point of research. A WEC behaves as a nonlinear system in real ocean waves and a control that approximates the behaviour of the system is required. In order to predict the behaviour of WEC, a controller is implemented with an aim to track the referenced trajectory for a force control application of the WEC. A neural model is implemented for the system identification and control of the nonlinear process with a neural nonlinear autoregressive moving average exogenous (NARMAX) model. The neural model updates the weights to reduce the error by using the Levenberg-Marquardt back-propagation algorithm for a single-input-single-output (SISO) nonlinear system. The performance of the system under the proposed scheme is compared to the same system under a PI-controller scheme, where the PI gains have been tuned accordingly, to verify the control capacity of the proposed controller. The results show a good tracking of dq (direct-quadrature) axes currents by regulating the stator currents, and hence a force control is achieved at different positions of the translator. The dynamic performance of the control is verified in a time domain analysis for the displacement of the translator.

TEKNIK OCH TEKNOLOGIER Elektroteknik och elektronik hsv//swe
ENGINEERING AND TECHNOLOGY Electrical Engineering, Electronic Engineering, Information Engineering hsv//eng
current control
force control
neural NARMAX
permanent magnet linear generator (PMLG)
wave energy converter
Elektroteknik med inriktning mot reglerteknik
Electrical Engineering with specialization in Automatic Control

Fregelius, MartinUppsala universitet,Elektricitetslära(Swepub:uu)marfr242 (author)
Almeida, Pedro (author)
Svensson, Olle,1967-Uppsala universitet,Elektricitetslära(Swepub:uu)olsve179 (author)
Temiz, Irina,1981-Uppsala universitet,Elektricitetslära(Swepub:uu)irido900 (author)
Oliveira, Janaína Goncalves de,1983-Uppsala universitet,Elektricitetslära(Swepub:uu)jango414 (author)
Boström, CeciliaUppsala universitet,Elektricitetslära(Swepub:uu)cecbo439 (author)
Leijon, Mats,1958-Uppsala universitet,Elektricitetslära(Swepub:uu)malei676 (author)
Uppsala universitetElektricitetslära (creator_code:org_t)

In:International Marine Energy JournalSouthampton, UK : International Marine Energy Journal2631-5548

By the author/editor: Parwal, Arvind; Fregelius, Marti ...; Almeida, Pedro; Svensson, Olle, ...; Temiz, Irina, 19 ...; Oliveira, Janaín ...; show more...; Boström, Cecilia; Leijon, Mats, 19 ...; show less...

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