Discrete-Time Causal Control of a Wave Energy Converter With Finite Stroke in Stochastic Waves

We consider feedback control design for a wave energy converter (WEC) for which the power takeoff (PTO) system has a finite stroke limit. Stationary stochastic wave loading is assumed, with a known spectrum, and the plant dynamics are assumed to be linear. We develop a technique for the design of a...

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Bibliographic Details
Published in:IEEE transactions on control systems technology 2022-05, Vol.30 (3), p.1198-1214
Main Authors: Lao, Yejun, Scruggs, Jeffrey T., Karthikeyan, Anantha, Previsic, Mirko
Format: Article
Language:English
Subjects:
Control design
Control systems design
Control theory
Controllers
Converters
Design
Design parameters
Feedback control
Feedback loops
Force
Hydrodynamics
Linear systems
Nonlinear control
Nonlinear feedback
ocean wave energy
Sensors
stochastic control
Stochastic processes
Transfer functions
Wave power
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Summary:We consider feedback control design for a wave energy converter (WEC) for which the power takeoff (PTO) system has a finite stroke limit. Stationary stochastic wave loading is assumed, with a known spectrum, and the plant dynamics are assumed to be linear. We develop a technique for the design of a discrete-time controller, which has three design stages. In the first stage, a linear controller is optimized while imposing a relaxation of the maximum stroke constraint on the design. In the second stage, a tandem nonlinear feedback loop is designed for the purpose of stroke protection. In the third stage, the two designs (linear and nonlinear) are fused in a manner that preserves the stability of the overall system. The technique is demonstrated in a simulation of a simple cylindrical buoy. We show that the controller may be tuned through the adjustment of scalar design parameters, which adjust the tradeoff between the mean generated power and the force levels required to protect the stroke.
ISSN:1063-6536
1558-0865
DOI:10.1109/TCST.2021.3100463