基于液压传动的海洋波浪换能系统功率解耦特性研究

海洋波浪能分布广、储量大、能流密度高，属于清洁可再生的优质能源，但由于波浪能输入功率不稳定且传动系统输入与输出功率的耦合等问题限制了其应用。分析了海洋波浪换能技术的特点和需求，提出一种基于液压传动的换能装置系统传动方案，该方案应用液压变压器的原理通过对变压网络到恒压网络的转换，实现了传动系统输入与输出的功率解耦，同时并联大容量蓄能器吸收系统中的压力和流量脉动，从而得到系统不同工况下的平稳、恒速输出。建立了该传动系统的数学模型并进行了仿真研究，结果表明：该系统可以为实现海洋波浪换能装置恒频、稳压的发电要求提供一种可能。

Study of Power Decoupling Properties of Hydraulic Power Take-off System in Ocean Wave Converter

As a kind of ocean energy, wave energy is a renewable energy with the character of widespread, abundant and highly energy flux density. But the extracting energy from waves is limited for its unstable power input and characterized with input output power coupling. The main characters and needs were analyzed and a hydraulic transmission scheme for the power take off system was proposed. The hydraulic transformer principle was applied in the hydraulic circuit to achieve variable pressure network to constant pressure network and power input output decoupling. Large capacity accumulator was installed in the circuit to absorb system pressure and flow pulsation. As a result, a constant power and speed output was achieved under different sea state condition. The mathematical model of the hydraulic power take off system was established, the simulation results show that it is possible to obtain a constant frequency and smooth voltage output from a ocean wave converter.