TY - GEN
T1 - New Formulation of Wave Energy Converter Control Using Extremum Seeking
AU - Tang, Siyang
AU - Chen, Wen Hua
AU - Liu, Cunjia
AU - Li, Zhongguo
N1 - Publisher Copyright:
Copyright © 2023 The Authors. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/)
PY - 2023/7/1
Y1 - 2023/7/1
N2 - Ocean wave energy converter (WEC) requires real-time control to maximise energy conversion. Effective control of wave energy converter is particularly challenging, since the ocean wave is highly uncertain and time-varying. Conventionally, instantaneous control methods are utilised, such as Bang-Bang control and model predictive control with wave prediction, which consequently requires fast controller and responses. In this paper, energy generated in a period of time is regarded as an entirety, and the main wave is considered to impose a periodic excitation force to WEC. Then, it is shown that the optimal power take-off force also follows a periodic function, by optimising which WEC is expected to generate maximum power output. The intriguing relationship among the harvested energy, wave properties and control force is derived in this paper. An extremum seeking control method is implemented to solve this reformulated problem. By extensive simulation results, the effectiveness of the proposed framework and control method is validated, which demonstrates high conversion efficiency comparing to Bang-Bang control and short-horizon optimal control.
AB - Ocean wave energy converter (WEC) requires real-time control to maximise energy conversion. Effective control of wave energy converter is particularly challenging, since the ocean wave is highly uncertain and time-varying. Conventionally, instantaneous control methods are utilised, such as Bang-Bang control and model predictive control with wave prediction, which consequently requires fast controller and responses. In this paper, energy generated in a period of time is regarded as an entirety, and the main wave is considered to impose a periodic excitation force to WEC. Then, it is shown that the optimal power take-off force also follows a periodic function, by optimising which WEC is expected to generate maximum power output. The intriguing relationship among the harvested energy, wave properties and control force is derived in this paper. An extremum seeking control method is implemented to solve this reformulated problem. By extensive simulation results, the effectiveness of the proposed framework and control method is validated, which demonstrates high conversion efficiency comparing to Bang-Bang control and short-horizon optimal control.
KW - extremum seeking control
KW - renewable energy systems
KW - Wave energy converter
UR - http://www.scopus.com/inward/record.url?scp=85183610431&partnerID=8YFLogxK
U2 - 10.1016/j.ifacol.2023.10.531
DO - 10.1016/j.ifacol.2023.10.531
M3 - Conference article published in proceeding or book
AN - SCOPUS:85183610431
T3 - IFAC-PapersOnLine
SP - 11705
EP - 11710
BT - IFAC-PapersOnLine
A2 - Ishii, Hideaki
A2 - Ebihara, Yoshio
A2 - Imura, Jun-ichi
A2 - Yamakita, Masaki
PB - Elsevier B.V.
T2 - 22nd IFAC World Congress
Y2 - 9 July 2023 through 14 July 2023
ER -