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.
Highlights
Compared with other wave energy capturing devices, the oscillating floater wave power generation device is simpler to manufacture
Summarizing the planned method of the above control strategy, we present the stable and bounded
The experimental platform is mainly composed of the float motion simulator, which is employed to simulate the motion of 1500 kg floats under different motion trails
Summary
Compared with other wave energy capturing devices, the oscillating floater wave power generation device is simpler to manufacture. A wave power generation experiment platform was designed that can be used to develop the working characteristics and the control strategies of the power generation device under different working conditions. It can provide the experimental basis for the marine engineering test and strengthen the stability and the security. The rationality of experiment platform design and the effectiveness of the control strategy were verified, the working characteristics of the hydraulic transmission system were studied, and the dynamic properties of the hydraulic parameters under different working conditions were revealed.
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