A pump storage hydroelectricity storage and generation system configured to burn un-scrubbed gas and generate electricity with minimal elevation differential between upper and lower fluid storage reservoirs.

A pump storage hydroelectricity storage and generation system configured to burn un-scrubbed gas and generate electricity with minimal elevation differential between upper and lower fluid storage reservoirs.

The invention concerns a method for starting a hydroelectric turbine (10) in a pumping mode, said turbine being provided with a runner (6) mechanically coupled to a shaft line (8) and a variable speed electric motor connected to a grid, a distributor (4) comprising guide vanes to control a flow of water to said runner, the method comprising: a) a step of operating the variable speed motor at least partly at fixed speed, said guide vanes being only partially opened, and of defining or calculating: data of a plurality of hydraulic characteristics (C.sub.1, C.sub.2, C.sub.i) of the turbine for an operation without cavitation; data of an operation range of the electric motor, giving the speed of the motor as a function of its power; b) then a step of operating the turbine in a power control mode.

The invention concerns a method for starting a hydroelectric turbine (10) in a pumping mode, said turbine being provided with a runner (6) mechanically coupled to a shaft line (8) and a variable speed electric motor connected to a grid, a distributor (4) comprising guide vanes to control a flow of water to said runner, the method comprising: a) a step of operating the variable speed motor at least partly at fixed speed, said guide vanes being only partially opened, and of defining or calculating: data of a plurality of hydraulic characteristics (C.sub.1, C.sub.2, C.sub.i) of the turbine for an operation without cavitation; data of an operation range of the electric motor, giving the speed of the motor as a function of its power; b) then a step of operating the turbine in a power control mode.

A combined gas-liquid two-phase energy storage and power generation system includes a compressed gas storage unit, a first gas pipeline, a liquid piston device, a hydraulic energy conversion unit and a first pumped power generation unit. The combined gas-liquid two-phase energy storage and power generation system connects the liquid piston device and a first port group of the hydraulic energy conversion unit and receives/outputs the hydraulic potential from/to the first port group, and connects the first pumped power generation unit with the second port group of the hydraulic energy conversion unit and receives/outputs the hydraulic potential from/to the second port group.

A combined gas-liquid two-phase energy storage and power generation system includes a compressed gas storage unit, a first gas pipeline, a liquid piston device, a hydraulic energy conversion unit and a first pumped power generation unit. The combined gas-liquid two-phase energy storage and power generation system connects the liquid piston device and a first port group of the hydraulic energy conversion unit and receives/outputs the hydraulic potential from/to the first port group, and connects the first pumped power generation unit with the second port group of the hydraulic energy conversion unit and receives/outputs the hydraulic potential from/to the second port group.

The present invention relates to a hydroelectric power generator using ebb and flow of seawater. More particularly, the hydroelectric power generator is able to continuously generate power through high tide and low tide created according to a tidal difference that continuously occurs, while being submerged in seawater, using a marine current that flows fast. The hydroelectric power generator is also able to utilize eco-friendly energy that does not require a reservoir by adjusting the amount of inflow of seawater and to be installed at various places, while being varied in size, as necessary.

The present invention relates to a hydroelectric power generator using ebb and flow of seawater. More particularly, the hydroelectric power generator is able to continuously generate power through high tide and low tide created according to a tidal difference that continuously occurs, while being submerged in seawater, using a marine current that flows fast. The hydroelectric power generator is also able to utilize eco-friendly energy that does not require a reservoir by adjusting the amount of inflow of seawater and to be installed at various places, while being varied in size, as necessary.

The present invention is a method of controlling a wave energy system (COM), wherein the force f.sub.ex exerted by the waves on a mobile float of the wave energy system is estimated, then at least one dominant frequency .sub.ex of the force exerted by the waves on the mobile float is determined using an unscented Kalman filter (UKF), and the control (COM) of the wave energy system is determined by a variable-gain PI control law whose coefficients are a function of dominant frequency .sub.ex.

Propulsion can be achieved without expelling matter by using a non-inertial subsystem to generate substantial internal Coriolis recoil forces that supply propulsion. A unique subsystem has been designed in which mass (fluids) is discretely injected radially into a non-inertial system comprising arrays of spinning radially-oriented vanes mounted on thin discs forming a stacked array of rectangular cross section tubes lock onto a common spinning shaft. In the preferred embodiment of the invention, the mass (fluid) is input into the tubes at the circumference of the spinning system by radially injecting the fluid at high velocity onto one tube at a time at the outer end of the tubes. The mass is then centrifugally slowed as it travels in toward the axis and leaves the system at a very low velocity near the axis of rotation. During the retarded motion, the tubes experience a continuous Coriolis recoil force that is opposite the rotation direction at each instantaneous location to which the mass has been centrifugally decelerated. The resultant non-linear Coriolis reaction or recoil is constrained to acting through the axis of rotation of the spinning discs by keeping the rotation rate constant. All Coriolis recoil forces act through the center of rotation no matter where in a tube a mass has been propelled as long as the rotation rate is held constant. The integrated reactive Coriolis force from each injected fluid mass is non-linear and orders of magnitude larger than occurs in commercial symmetric rotating-vane systems. The net integrated reactive force acting on the axis of rotation of the subsystem produces a propulsive force. The injected and retarded fluids are captured near the rotation axis and recirculated back to the input injectors. By conserving the reaction mass, a closed propulsion system can be designed that only depends on the availability of power from a variety of sources.