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

Wei Zhang, Shizhen Li, Yanjun Liu, Detang Li and Qin He
Additional contact information
Wei Zhang: School of Mechanical and Electronic Engineering, Shandong Jianzhu University, Jinan 250101, China
Shizhen Li: Department of Marine Science and Technology, Shandong University, Qingdao 266237, China
Yanjun Liu: Department of Marine Science and Technology, Shandong University, Qingdao 266237, China
Detang Li: Department of Ship and Mechanical and Electrical Engineering, Zhejiang Ocean University, Zhoushan 316022, China
Qin He: School of Mechanical and Electronic Engineering, Shandong Jianzhu University, Jinan 250101, China

Energies, 2020, vol. 13, issue 11, 1-17

Abstract: 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.

Keywords: hydraulic transmission system; experimental platform; control strategy; Lyapunov criterion (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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