Abstract To understand the influence of complex hydrodynamic loads on tidal turbines, laboratory testing is necessary as a first approach. Previous laboratory work undertaken gave an indication that the use of speed control strategies may disguise the associated loading range that a turbine may be subjected to when this is operated with a variable speed control strategy. However, the preceding work was undertaken in a highly controlled environment without the influence of turbulent flows. The focus of this paper is directed towards the study of wave-induced loads on tidal turbines when these are controlled using two strategies and the impact that these parameters have on the turbine’s performance when this is operated in a recirculating flume. Laboratory tests were undertaken with a 0.9 m diameter horizontal axis tidal turbine subjected to combined wave and current conditions with both regular and irregular waves. Constant speed and constant torque control strategies have been considered, for which rotor thrust, torque and blade root bending moment have been measured. Results show that similar to previous studies, average loads and power capture values remain unchanged between control strategies and the superposition of waves to the current. However, signal fluctuations are 2 to 3 times higher for torque control than for constant speed control strategy. A phase difference between the periodic signals of the turbine thrust and the incoming waves was also identified, in this case, the phase variation was lower when using torque than speed control. This work thus demonstrates the implication of studying strategies to control a marine converter from early stages of development.

中文翻译：

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控制策略和波浪气候对实验室规模水平轴潮汐涡轮机负载和性能的影响分析

摘要 要了解复杂的水动力载荷对潮汐涡轮机的影响，首先需要进行实验室测试。先前进行的实验室工作表明，使用速度控制策略可能会掩盖涡轮机在以可变速度控制策略运行时可能受到的相关负载范围。然而，前面的工作是在没有湍流影响的高度受控的环境中进行的。本文的重点是研究潮汐涡轮机上使用两种策略控制时的波浪诱导载荷，以及这些参数在循环水槽中运行时对涡轮机性能的影响。实验室测试以 0 进行。直径为 9 m 的水平轴潮汐涡轮机受到波浪和水流条件的影响，包括规则波和不规则波。已经考虑了恒速和恒转矩控制策略，为此已经测量了转子推力、转矩和叶根弯矩。结果表明，与之前的研究类似，平均负载和功率捕获值在控制策略和波浪叠加到电流之间保持不变。然而，转矩控制的信号波动比恒速控制策略高 2 到 3 倍。还确定了涡轮推力的周期信号和传入波之间的相位差，在这种情况下，使用扭矩控制时的相位变化低于速度控制。