River turbines, also known as zero-head or in-stream turbines, produce electrical power with the kinetic energy of flowing water. Lower investment requirements in their infrastructure, as no dam/head differentials is needed, make them a promising solution to the practice of reducing the power production from conventional resources, especially in remote/off-grid applications. In this work, a speed converter design is introduced to be used for harnessing the hydrokinetic power in a moving mass of water. In contrast to power converters, that convert a variable power to a constant power, a speed converter, converts a variable rotational speed into a constant speed. It has four major advantages: (1) the all-gear configuration facilitates scalability of the power rating, (2) the produced constant speed, a grid-quality constant frequency, with/without grid connection, can be generated, (3) it’s simple and durable design make it a more economic option. The results show these advantageous through lab-scale and real-environment experimental testing.

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