Analysis of a Horizontal-Axis Tidal Turbine Performance in the Presence of Regular and Irregular Waves Using Two Control Strategies
Analysis of a Horizontal-Axis Tidal Turbine Performance in the Presence of Regular and Irregular Waves Using Two Control Strategies
复制标题
DOI：
10.3390/en12030367
复制
发表时间：
2019-01
期刊：
影响因子：
3.2
通讯作者：
S. Ordoñez-Sanchez;Matthew Allmark;Kate Porter;R. Ellis;Catherine Lloyd;I. Santic;T. O’Doherty;C. Johnstone
中科院分区：
文献类型：
--
作者：
S. Ordoñez-Sanchez;Matthew Allmark;Kate Porter;R. Ellis;Catherine Lloyd;I. Santic;T. O’Doherty;C. Johnstone
在潮汐场地上形成的流动可以用湍流、剪切流和波浪的组合来表征。因此，水平轴潮汐涡轮机承受动态载荷，这可能会损害转子和传动系部件的工作寿命。为此，在拖曳水池设施中使用0.9 m水平轴潮汐涡轮机进行了一系列实验。实验包括两种规则波形，一种模拟极端波浪情况，另一种模拟较温和的波浪情况。第二个规则波的设计是为了匹配一个不规则波的峰值周期和有效波高，也进行了测试。在试验活动期间测量扭矩、推力和叶片弯矩。针对一系列运行点实施速度和转矩控制策略，以研究控制模式对潮流涡轮机性能的影响。结果表明，相似的平均功率和推力值不受控制策略的影响，也没有规则波或不规则波的情况下的影响。然而，据观察，使用扭矩控制导致每个波周期的推力和叶片根部弯矩波动增加。与速度控制情况相比，波动的增加约为40%。
The flow developed on a tidal site can be characterized by combinations of turbulence, shear flows, and waves. Horizontal-axis tidal turbines are therefore subjected to dynamic loadings that may compromise the working life of the rotor and drive train components. To this end, a series of experiments were carried out using a 0.9 m horizontal-axis tidal turbine in a tow tank facility. The experiments included two types of regular waveforms, one of them simulating an extreme wave case, the other simulating a more moderate wave case. The second regular wave was designed to match the peak period and significant wave height of an irregular wave which was also tested. Measurements of torque, thrust, and blade-bending moments were taken during the testing campaign. Speed and torque control strategies were implemented for a range of operational points to investigate the influence that a control mode had in the performance of a tidal stream turbine. The results showed similar average power and thrust values were not affected by the control strategy, nor the influence of either the regular or irregular wave cases. However, it was observed that using torque control resulted in an increase of thrust and blade root bending moment fluctuations per wave period. The increase in fluctuations was in the order of 40% when compared to the speed control cases.