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

Lao, Yejun; Scruggs, Jeffrey T.; Karthikeyan, Anantha; Previsic, Mirko

doi:10.1109/TCST.2021.3100463

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

Journal Article · Thu Aug 12 00:00:00 EDT 2021 · IEEE Transactions on Control Systems Technology

DOI:https://doi.org/10.1109/TCST.2021.3100463· OSTI ID:1856252

Lao, Yejun ^[1]; Scruggs, Jeffrey T.; Karthikeyan, Anantha; Previsic, Mirko

Re Vision Consulting

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.

View Accepted Manuscript (DOE)

Research Organization:: Re Vision Consulting, LLC, Sacramento, CA (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Water Power Technologies Office

Grant/Contract Number:: EE0007173; EE0008099

OSTI ID:: 1856252

Alternate ID(s):: OSTI ID: 1856261
OSTI ID: 1856263

Journal Information:: IEEE Transactions on Control Systems Technology, Journal Name: IEEE Transactions on Control Systems Technology

Country of Publication:: United States

Language:: English

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