The present invention relates to an inlet screen adapted to be arranged at the water inlet (8) of a hydropower plant and comprises a plurality of elongated bars (20), said bars (20) being separated by a distance holding means, each elongated bar (20) having in its elongation a proximal portion and a distal portion, and an upstream region and a downstream region, said upstream and downstream regions being at an angle in relation to said proximal and distal portions, at least one of said bars (20) defining a space (36; 36a) extending along at least a portion of the elongation of said bar (20), said bar (20) being provided with an electric heating means (31). In accordance with the invention, said elongated bar has an elongated intermediate portion (38a), said space (36; 36a) being defined in either of the upstream region (35a) and the downstream region (35b), said intermediate portion (38a) extending along the elongation of the bar (20) between the upstream region (35a) and the downstream region (35b), said electric heating means (31) comprising at least one electric heating member (37) being introduced into said space (36; 36a).

Disclosed is a submerged power generation system. The system may include a hollow fluid flow column, substantially parallel with the direction of gravitational acceleration, a fluid inlet, and a fluid power generator in the hollow fluid column. The system may further include fluid outlets and a pump system at the end of the fluid column opposite from the inlet. Further, an electrical distribution cable or power distribution system in communication with said fluid power generator may also be integrated into the system. Various other power storage, generation, and distribution systems may be integrated into the system to further enhance the efficiency and capabilities of the hydroelectric power generation system.

A fluid driven turbine apparatus includes a hollow body and rib plates annularly disposed in the hollow body. A vane module is disposed in the hollow body and co-axially connected to a shaft extending axially through the hollow body. The rib plates surround the vane module and are spaced apart from the vane module by an annular gap. The annular gap has a width gradually enlarged in a top-to-bottom direction. When fluid flows into the vane module and is diverted sideward to the annular gap, large sand grains carried by fluid may pass through an enlarged lower portion of the annular gap without getting stuck therein and abrading the rib plates and the vane module.

A fluid driven turbine apparatus includes a hollow body and rib plates annularly disposed in the hollow body. A vane module is disposed in the hollow body and co-axially connected to a shaft extending axially through the hollow body. The rib plates surround the vane module and are spaced apart from the vane module by an annular gap. The annular gap has a width gradually enlarged in a top-to-bottom direction. When fluid flows into the vane module and is diverted sideward to the annular gap, large sand grains carried by fluid may pass through an enlarged lower portion of the annular gap without getting stuck therein and abrading the rib plates and the vane module.

A hydrodynamic electrification system that generates electricity from water moving from a high side to a low side and around a structure that divides the low side from the high side generally includes a water transport system that directs the water from the high side presenting a hydraulic head, over the structure, and to the low side. The system includes a power extraction system having a wheel that receives the water from said water transport system and a mounting system having a high side anchor that connects near an intake to the water transport system at the high side and having a low side anchor that connects to the power extraction system at the low side.

An energy generating device having a drum and at least one vane that is movable between a deployed state and a stowed state as the drum rotates to capture energy potential from flowing water and converting it to usable electrical and/or mechanical energy. The movable vanes can automatically retract when not in the flow of water and re-deploy when entering the flow of water over the drum. The present system can generate usable electricity or mechanical energy from slow but steadily flowing bodies of water without the need to dam, restrict, or alter the path of the water flow.

Provided is a hydro farm having two or more energy generating devices having movable vanes that can automatically retract when not in the flow of water and re-deploy when entering the flow of water to generate usable electrical and/or mechanical energy from the energy potential of flowing water. The hydro farm can supply usable electricity or mechanical energy from slow but steadily flowing bodies of water. The hydro farm can also be used to charge portable energy storage structures, such as trailers, that can be delivered to an area remote from the hydro farm via truck or other transportation modes.

A control device performs a control process including the steps of: determining whether a predetermined condition has been established; when it has been determined that the predetermined condition has been established, clearing a counter; performing reverse rotation control; performing forward rotation control; incrementing the counter; and determining whether the counter's counted value has reached an upper limit.

A control device performs a control process including the steps of: determining whether a predetermined condition has been established; when it has been determined that the predetermined condition has been established, clearing a counter; performing reverse rotation control; performing forward rotation control; incrementing the counter; and determining whether the counter's counted value has reached an upper limit.

This disclosure is directed to hydrodynamic electric generators, including their structural design, methods of deployment, anchoring systems, drive systems and control systems. The system can be scaled from ones that can be hand carried to large, stationary devices that can generate up to and greater than 20 kw in a current of 3 knots. In a stationary system, the device can be anchored to an underwater floor by an anchoring device supported by four adjustable legs. These legs can eliminate the need for extensive mooring lines, providing the device with a small footprint that is non-hazardous to marine animals or vegetation. Individual components, such as rotors, generators and other mechanical components can be modularly installed for easy removal and servicing without having to disturb the entire system.