DocumentCode :
79168
Title :
Performance Improvement of a Point Absorber Wave Energy Converter by Application of an Observer-Based Control: Results From Wave Tank Testing
Author :
Kracht, Peter ; Perez-Becker, Sebastian ; Richard, Jean-Baptiste ; Fischer, Boris
Author_Institution :
Freelance, Kassel, Germany
Volume :
51
Issue :
4
fYear :
2015
fDate :
July-Aug. 2015
Firstpage :
3426
Lastpage :
3434
Abstract :
In recent years, many advanced control strategies have been proposed for wave energy converters (WECs), which significantly increase the energy conversion rate of the devices. So far, most of these control schemes have only been investigated theoretically using simulations, which, to a great extent, are based on idealized assumptions. On the contrast, far less information regarding the testing of these control schemes in experimental setups can be found. Under such circumstances, the control performance might be compromised by many factors such as model uncertainties, measurement noise, or delay. This paper compares the performance of a spring damper control and an advanced control strategy for a point absorber WEC in wave tank experiments. For two different irregular sea states, the energy conversion of the advanced control, which uses an observer to estimate the wave excitation force, is compared to the performance of a spring damper control. The results show that, with the advanced controller around 13%-14%, more energy could be converted when compared to the spring damper control. Additionally, the observing process was found to be critical in the advanced control. The conducted experiments show that an increase in the observer accuracy holds a theoretical potential to further improve the energy conversion rate by 15%-25%.
Keywords :
power system control; wave power generation; wave power plants; energy conversion rate; measurement noise; observer-based control; point absorber wave energy converter; spring damper control; wave tank testing; Energy conversion; Force; Mathematical model; Observers; Shock absorbers; Springs; Torque; Control; control; linear observer; point absorber; wave energy converter; wave energy converter (WEC); wave tank testing;
fLanguage :
English
Journal_Title :
Industry Applications, IEEE Transactions on
Publisher :
ieee
ISSN :
0093-9994
Type :
jour
DOI :
10.1109/TIA.2015.2405892
Filename :
7047903
Link To Document :
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