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Article

Optimal Control for Hydraulic Cylinder Tracking Displacement of Wave Energy Experimental Platform

1
School of Mechanical and Electronic Engineering, Shandong Jianzhu University, Jinan 250101, China
2
Department of Marine Science and Technology, Shandong University, Qingdao 266237, China
3
Department of Ship and Mechanical and Electrical Engineering, Zhejiang Ocean University, Zhoushan 316022, China
*
Author to whom correspondence should be addressed.
Energies 2020, 13(11), 2876; https://doi.org/10.3390/en13112876
Received: 1 May 2020 / Revised: 27 May 2020 / Accepted: 3 June 2020 / Published: 4 June 2020
(This article belongs to the Section A3: Wind, Wave and Tidal Energy)
The wave energy converter captures the wave power by buoy’s heaving motion, transfers it by hydraulic system, and converts it into the electric power by generator. The hydraulic conversion system plays an important role that can realize the effective regulation of the output power. In order to develop the working characteristics of the hydraulic transmission system, a new wave energy experimental platform was devised. The platform adopts the matching design mode of the driving oil cylinder and the driven oil cylinder. The active hydraulic cylinder and the clump weight can simulate the movement of the oscillating float under certain sea conditions, and the driven oil cylinder realizes the conversion and the output of wave energy. In order to improve the operation accuracy of the active hydraulic cylinder, the control strategy of the active hydraulic cylinder was studied. An adaptive sliding mode control strategy based on the back-stepping method was proposed to overcome the influence of the parameter uncertainty in state equation. The adaptive law was designed by Lyapunov criterion to ensure the stability and the convergence of the closed-loop system. The proposed control strategy was verified and compared with proportional integral derivative control strategy through the concrete experiment, which shows the rapidity and the stability of it. The hydraulic transmission system of wave energy converter was developed; at the same time, the characteristics of hydraulic regulation under different working conditions were summarized through experiments. The results of the research could be the guidance for the power control design. View Full-Text
Keywords: hydraulic transmission system; experimental platform; control strategy; Lyapunov criterion hydraulic transmission system; experimental platform; control strategy; Lyapunov criterion
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MDPI and ACS Style

Zhang, W.; Li, S.; Liu, Y.; Li, D.; He, Q. Optimal Control for Hydraulic Cylinder Tracking Displacement of Wave Energy Experimental Platform. Energies 2020, 13, 2876. https://doi.org/10.3390/en13112876

AMA Style

Zhang W, Li S, Liu Y, Li D, He Q. Optimal Control for Hydraulic Cylinder Tracking Displacement of Wave Energy Experimental Platform. Energies. 2020; 13(11):2876. https://doi.org/10.3390/en13112876

Chicago/Turabian Style

Zhang, Wei, Shizhen Li, Yanjun Liu, Detang Li, and Qin He. 2020. "Optimal Control for Hydraulic Cylinder Tracking Displacement of Wave Energy Experimental Platform" Energies 13, no. 11: 2876. https://doi.org/10.3390/en13112876

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