@article{Feng:2015:10.1109/TSTE.2015.2410784,
author = {Feng, Z and Kerrigan, EC},
doi = {10.1109/TSTE.2015.2410784},
journal = {IEEE Transactions on Sustainable Energy},
pages = {773--780},
title = {Latching-Declutching Control of Wave Energy Converters Using Derivative-Free Optimization},
url = {http://dx.doi.org/10.1109/TSTE.2015.2410784},
volume = {6},
year = {2015}
}

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TY  - JOUR
AB  - We consider predictive control of a wave energy converter(WEC) that can switch between three modes: 1) powergeneration; 2) declutched with no power generation; or 3) latchedwith zero velocity. We propose a formulation that turns the optimalcontrol problem into a small dimensional discrete optimizationproblem, where the only decision variables are bounds onthe latching time and power take-off (PTO) time, whereas theobjective function is computed from the trajectory of a hybridsystem with linear dynamics in each sample interval. The optimizationproblem is solved using a novel derivative-free algorithmthat exploits the quantization of the decision variables in orderto reduce the number of function evaluations. Two closed-loopformulations are also studied within a receding horizon implementation:the first one uses past wave information and can double theenergy generation compared to the uncontrolled case, while thesecond formulation uses predictions of future waves and is able toresult in a further increase in energy generation. The benefits ofcodesigning the physical system and controller is compared to thesequential approach of first optimizing the physical system withoutcontrol, followed by controller design.
AU  - Feng,Z
AU  - Kerrigan,EC
DO  - 10.1109/TSTE.2015.2410784
EP  - 780
PY  - 2015///
SN  - 1949-3029
SP  - 773
TI  - Latching-Declutching Control of Wave Energy Converters Using Derivative-Free Optimization
T2  - IEEE Transactions on Sustainable Energy
UR  - http://dx.doi.org/10.1109/TSTE.2015.2410784
UR  - http://hdl.handle.net/10044/1/26451
VL  - 6
ER  - 

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