1. Optimal Control for Hydraulic Cylinder Tracking Displacement of Wave Energy Experimental Platform
- Author
-
De-Tang Li, Qin He, Yanjun Liu, Wei Zhang, and Shizhen Li
- Subjects
Control and Optimization ,Computer science ,020209 energy ,Energy Engineering and Power Technology ,PID controller ,02 engineering and technology ,Sliding mode control ,lcsh:Technology ,Physics::Fluid Dynamics ,Control theory ,experimental platform ,0202 electrical engineering, electronic engineering, information engineering ,Cylinder ,hydraulic transmission system ,Electrical and Electronic Engineering ,Hydraulic machinery ,Engineering (miscellaneous) ,Physics::Atmospheric and Oceanic Physics ,Renewable Energy, Sustainability and the Environment ,Oscillation ,Lyapunov criterion ,lcsh:T ,020208 electrical & electronic engineering ,Optimal control ,control strategy ,Power (physics) ,Hydraulic cylinder ,Energy (miscellaneous) - 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.
- Published
- 2020