High operation performance of a tidal current energy converter (TCEC) requires a gear transmission with a continuously variable speed ratio for low-speed and high-torque conditions. A nonlinear closed-loop control combined with an integral time-delay feedback control is developed to adjust the speed ratio of an infinitely variable transmission (IVT) system for TCECs. A speed ratio control for the IVT system involves a forward speed controller and a crank length controller for different tidal current speed ranges. The time-delay control is designed to reduce speed fluctuations of the output speed of the IVT with an accurate speed ratio. Experimental investigation was carried out to test the validity of the proposed control strategy for the IVT system. An instrumented rotation speed measurement system is designed so that quantities needed for the time-delay control variable can be measured. Experimental results show that the speed ratio of the IVT with the proposed control strategy can achieve an excellent tracking response for the desired constant output speed and reduce speed fluctuations of the output speed of the IVT by the time-delay feedback control.

中文翻译：

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潮流能量转换器无级变速传输系统控制的实验研究

潮汐流能量转换器 (TCEC) 的高运行性能需要在低速和高扭矩条件下具有无级变速比的齿轮传动装置。开发了一种非线性闭环控制与积分延迟反馈控制相结合，用于调整 TCEC 的无级变速器 (IVT) 系统的速比。IVT 系统的速比控制涉及不同潮流速度范围的前进速度控制器和曲柄长度控制器。延时控制旨在以精确的速比减少IVT输出速度的速度波动。进行了实验研究以测试所提出的 IVT 系统控制策略的有效性。设计了仪表化转速测量系统，以便可以测量延时控制变量所需的量。实验结果表明，采用所提出的控制策略的IVT速比可以实现对所需恒定输出速度的良好跟踪响应，并通过时滞反馈控制减少IVT输出速度的速度波动。