Design and Control of Hydraulic Power Take-Off System for an Array of Point Absorber Wave Energy Converters

Dengshuai Wang, Zhenquan Zhang, Yunpeng Hai, Yanjun Liu () and Gang Xue ()
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Dengshuai Wang: Institute of Marine Science and Technology, Shandong University, Qingdao 266237, China
Zhenquan Zhang: Institute of Marine Science and Technology, Shandong University, Qingdao 266237, China
Yunpeng Hai: Key Laboratory of High-Efficiency and Clean Mechanical Manufacture of Ministry of Education, National Demonstration Center for Experimental Mechanical Engineering Education, School of Mechanical Engineering, Shandong University, Jinan 250061, China
Yanjun Liu: Institute of Marine Science and Technology, Shandong University, Qingdao 266237, China
Gang Xue: Institute of Marine Science and Technology, Shandong University, Qingdao 266237, China

Sustainability, 2023, vol. 15, issue 22, 1-25

Abstract: The development of wave energy converter (WEC) arrays is an effective way to reduce the cost of levelized energy and facilitate the commercialization of WECs. This study proposes a hydraulic power take-off (PTO) system for an array of point absorber wave energy converters (PA-WECs) and designs a control system using a novel algorithm called the improved simplified universal intelligent PID (ISUIPID) controller and the adaptive matching controller including an improved artificial gorilla troops optimizer (IGTO) to improve and stabilize the output power of PA-WEC arrays. Simulations under varying irregular wave states have been carried out to verify the validity of the mathematical model and the control system. The results show that the designed IGTO has faster convergence speed and better convergence accuracy in solving the optimal linear damping coefficient of the generator, and the proposed ISUIPID controller provides superior performance in tracking the speed of the hydraulic motor under the changing sea states. In addition, the capture power and output power of the array of PA-WECs are improved and the electrical energy can be output stably under the designed control system. The array of PA-WECs with the proposed control system will become an independent, stable, efficient, and sustainable power supply system.

Keywords: wave energy converter; arrays; hydraulic PTO system; improved artificial gorilla troops optimizer; improved simplified universal intelligent PID (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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