Extracting energy from a free-flow marine current using a vertical axis fixed pitch turbine requires a generator that can handle varying speeds and loads, since such a turbine gives maximum power capture for a fixed tip speed ratio. A prototype of such a generator has been designed and constructed. In this paper, its variable speed and load operation is evaluated, both in terms of how the constructed generator performs in relation to simulations, and in terms of how the generator could perform with three different fixed pitch turbines. Measurements of root mean square (RMS) voltage and current differ 10% from simulations. Performance analysis with example turbines shows that the generator can match fixed tip speed ratio operation of several turbines for current speeds between 0.5 and 2.5 m/s.
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机译：使用垂直轴固定螺距涡轮机从自由流动的海流中提取能量需要一种能够处理变化的速度和负载的发电机，因为这种涡轮机在固定的叶尖速比下可提供最大的功率捕获。已经设计并构造了这种发电机的原型。在本文中，从构造的发电机相对于仿真的性能方面以及发电机如何在三种不同的固定螺距涡轮机上发挥性能方面，对发电机的变速和负载运行进行了评估。均方根（RMS）电压和电流的测量值与模拟值相差10％。用示例涡轮进行的性能分析表明，在当前速度介于0.5和2.5 m / s之间的情况下，发电机可以匹配多个涡轮的固定叶尖速比运行。
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