Research on the energy conversion characteristics of a novel distributed array hydraulic PTO system with wave-adaptive capabilities

Chenglong Li, Peng Qian and Dahai Zhang

Energy, 2025, vol. 329, issue C

Abstract: Wave energy is a major source of ocean renewable energy. To harness its potential, this paper presents an articulated multi-body wave energy converter (WEC) equipped with a novel distributed array hydraulic power take-off (PTO) system, tailored to China's sea conditions. The system is designed to efficiently harvest both meager and abundant wave energy resources. A swing cylinder 6-bar mechanism is introduced to convert wave energy into mechanical energy. A comprehensive mechanical-electrical-hydraulic coupling model is developed, integrating the hydraulic system, mechanical linkage, and control components. The analysis evaluates the impact of parameters such as accumulator nitrogen charging pressure, accumulator release pressure, and oil filling quantity on the dynamic characteristics of the system, leading to the optimization of hydraulic system parameters. Energy conversion under both regular and irregular waves is simulated. A test platform is established to experimentally evaluate both the pressure regulation and power generation capabilities of the distributed PTO system. Simulation results closely match experimental data, validating the model and optimization approach. Finally, a prototype sea-trial confirms the feasibility and effectiveness of the proposed hydraulic PTO system for articulated multi-body WEC, laying a solid foundation for future scaling and deployment.

Keywords: Wave energy converter; Articulated multi-body WEC; Hydraulic PTO system; WEC array; Mechanical-electrical-hydraulic coupling model (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:329:y:2025:i:c:s036054422502331x

DOI: 10.1016/j.energy.2025.136689

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