海浪能源转换无槽Halbach直线发电机的建模仿真研究

Modelling and Simulation of the Slotless Halbach Linear Generator based on Wave Energy Converter

在过去的几十年,对于海浪能源的利用总能引起人们极大的关注。本文提出一种无槽霍尔贝克(Halbach)直线发电机的综合分析模型,包括流体效应和本征磁分布模型,用于将海浪的动能转换为电能。在假设流体是无黏性、无旋涡和不可压缩的情况下,将势能理论用于模拟六自由度的海浪作用,采用矢量磁势法推导得出发电机的特性表达式,分析结果与有限元仿真结果相符合。将该模型看作质点弹性阻尼系统,就是一个综合性的模型。在模型仿真中,需要重点关注真实海浪频谱的响应,以此评估该模型投入实际使用的可行性。附加的频谱响应表明,可以通过使能量输出系统保持较小的弹性刚度,来达到最大的功率输出。

Over the past decades,harnessing the ocean wave energy has attracted tremendous attentions.In this paper,we present a comprehensive analytical model of slotless Halbach linear generator,which includes hydrodynamic effect and intrinsic magnetic distribution model,for generating electrical power from wave motion.The potential theory has been applied to model the 6-DOF wave-structural interaction while assuming the fluid is inviscid,irrotational,and incompressible.The magnetic vector potential method has been employed to derive the expressions for describing the performance of the generator.A good match between analytical result and the FEM result was achieved.Treating the whole structure as a mass-spring-damper system,a comprehensive model has been obtained.During the simulation,we have paid a special attention to the response regarding the real ocean waves spectrum for evaluating the potential of using the model as a design tool.The additional frequency domain response shows that it is preferred to maintain a low spring stiffness of the power take-off system for achieving the maximum power output.