Mini-hydroelectric power station on cables. Encyclopedia of radio electronics and electrical engineering

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California-based Bourne Energy has developed a series of generators that could transform small hydropower.

The devices RiverStar, TidalStar and OceanStar are designed to become the basis of relatively inexpensive and easily scalable hydroelectric power plants (HPPs) operating on rivers (RiverStar), in straits (TidalStar) and on the high seas (OceanStar). These installations have a number of interesting features.

The RiverStar is an encapsulated module with a float to hold the rotor at a given depth, a stabilizer fin, a slow rotating impeller (which does not harm the fish), a generator and a voltage converter. Several of these capsules, as conceived by Bourne Energy, can be submerged in a river stream to create a mini-hydroelectric power station.

RiverStar modules do not require any river bottom works, anchors or dams to be installed. Such a chain of generators is held on a pair of steel cables stretched across the river (going under water). Together with these rods, cables go ashore, through which current flows. The power of one such capsule is 50 kW (at a current speed of 7,4 km/h). 20 RiverStar units can provide electricity to 1 nearby homes.

In addition to a simple smooth body, the capsules may look like islands with grass and shrubs, sandbanks or large stones.

TidalStar capsules are similar to RiverStar and should be installed in estuaries or straits where there are variable tidal currents. For the installation of these generators, tensioned cables from one bank to another are also needed.

The OceanStar system is more complex. The generators with "turntables" here are the same as in the two previous models. However, they are mounted on a large swinging "wing", which converts the variable pressure (produced by the passing waves) into water turbulence, entraining the screws of the generators. Unlike previously designed or built wave power plants, OceanStar is hidden underwater.

According to Gizmag

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