A Comparative Study of Model Predictive Control and Optimal Causal Control for Heaving Point Absorbers

Previsic, Mirko; Karthikeyan, Anantha; Scruggs, Jeff

doi:10.3390/jmse9080805

A Comparative Study of Model Predictive Control and Optimal Causal Control for Heaving Point Absorbers

Journal Article · Tue Jul 27 00:00:00 EDT 2021 · Journal of Marine Science and Engineering

DOI:https://doi.org/10.3390/jmse9080805· OSTI ID:1810437

; Karthikeyan, Anantha; Scruggs, Jeff

Efforts by various researchers in recent years to design simple causal control laws that can be applied to WEC devices suggest that these controllers can yield similar levels of energy output as those of more complex non-causal controllers. However, most studies were established without adequately considering device and power conversion system constraints which are relevant design drivers from a cost and economic point of view. It is therefore imperative to understand the benefits of MPC compared to causal control from a performance and constraint handling perspective. In this paper, we compare linear MPC to a casual controller that incorporates constraint handling to benchmark its performance on a one DoF heaving point absorber in a range of wave conditions. Our analysis demonstrates that MPC provides significant performance advantages compared to an optimized causal controller, particularly if significant constraints on device motion and/or forces are imposed. We further demonstrate that distinct control performance regions can be established that correlate well with classical point absorber and volumetric limits of the wave energy conversion device.

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Research Organization:: ReVision 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

OSTI ID:: 1810437

Alternate ID(s):: OSTI ID: 1842495

Journal Information:: Journal of Marine Science and Engineering, Journal Name: Journal of Marine Science and Engineering Journal Issue: 8 Vol. 9; ISSN JMSEGL; ISSN 2077-1312

Publisher:: MDPI AGCopyright Statement

Country of Publication:: Switzerland

Language:: English

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