The present invention belongs to the field of energy harvesting, and in particular relates to an ocean wave energy collector based on magnetic force and triboelectric effect. The ocean wave energy collector includes a plurality of protective shells connected by flexible metal spring modules; a magnetic oscillation system is installed in each protective shell in a matched mode and includes an electric energy output module and a plurality of magnetic oscillators, and each magnetic oscillator includes a first supporting body, a dielectric capsule, first magnet units, second magnet units, a supporting shell, and an electrode unit.

An energy storage and regeneration system that converts irregular, non-constant, and variable input power to regular, constant, and controlled output power using hydraulics whereby the irregular input power is used to pump hydraulic fluid into an accumulator array where it is stored pressurized. Energy is released in a controlled fashion using a hydraulic motor operated by the pressurized hydraulic fluid from the accumulator array, in accordance with the specified power demand. One or more power units may be deployed depending on the amount of energy required at the output. Each power unit includes a hydraulic motor and associated floating accumulator whose internal pressure is controlled to maintain a substantially constant pressure differential across its associated motor. The system can be integrated into various energy system sources including renewable energy such as wind, PV or thermal solar, wave, tidal, etc.

According to one embodiment, a pumped-storage power generation control device includes a control section that controls at least one of the pumping input of the pumped-storage power generation facility in the pumping operation and the power output of the pumped-storage power generation facility in the power generating operation such that a value, which is obtained by a predetermined calculation using the measurement value relating to the pumping input of the pumped-storage power generation facility in the pumping operation and the measurement value relating to the power output of the pumped-storage power generation facility in the power generating operation, becomes a set target value.

An energy storage system is provided. The system comprises an energy storage device comprising: a pressure vessel configured to store pressurised fluid; and one or more resilient elements, wherein the resilient elements comprise a plurality of filaments of resilient material braided to form the resilient elements, wherein the resilient elements are arranged within or about the pressure vessel, and wherein the energy storage device is configured such that storing pressurised fluid within the pressure vessel acts to tension or compress the resilient elements.

A system for generating power is disclosed. The system comprises a first storage reservoir for a first liquid fluid and a second storage reservoir for a second higher density fluid located at a lower elevation. Power is generated using a pump, a generator, and fluid displacement.

A system for desalinating water is disclosed. The system comprises a subsea reverse osmosis unit located beneath the surface of a body of water, a first liquid column comprising seawater, a second liquid column comprising desalinated water with a salinity less than seawater, and a brine discharge outlet. Due to the difference in density between the seawater and the desalinated water, the gravitational hydrostatic pressure of the first liquid column may be greater than the gravitational hydrostatic pressure of the second liquid column. At least a portion of the pressure difference for reverse osmosis desalination may be provided by the difference in gravitational hydrostatic pressure between the first liquid column and the second liquid column. A significant reduction in desalination energy consumption may be enabled by discharging the brine at an elevation lower than the maximum elevation of the first liquid column or the second liquid column.

A system for storing and generating power is disclosed. The system comprises a first storage reservoir configured to store a first fluid, a second storage reservoir located at a lower elevation than the first storage reservoir and configured to store a second fluid wherein said second fluid has a higher density than the first fluid, and a pump. In some embodiments a generator may be employed. The pump and the first and the second reservoir are operatively connected such that power is stored by displacing the second fluid in the second storage reservoir by pumping the first fluid from the first storage reservoir to the second storage reservoir and such that power is generated by allowing the pumped first fluid in the second storage reservoir to exit the second reservoir. The first fluid is generally a liquid.

The present disclosure provides a scheduling method for a power system based on flexible HVDC (high-voltage direct current) and a pumped storage power station, which belongs to a field of power system control technologies. The method is applicable in a power system having a flexible HVDC system and a pumped storage power station. By establishing a scheduling model for the power system, which contains an objective function and multiple constraints, and solving the scheduling model, a capability of the pumped storage power station is used to adjust the unstable output of the renewable energy power generator and stabilize fluctuant of the renewable energy power generation, such that a power incoming into a load center presents a stable ladder pattern and an optimal scheduling scheme can be obtained.

An integrated hybrid energy recovery and storage system for recovering and storing energy from multiple energy sources is disclosed. The system includes an accumulator unit having a high pressure accumulator and a low pressure accumulator. At least one piston is mounted for reciprocation in the high pressure accumulator. The accumulator unit is configured to receive, store, and transfer energy from the hydraulic fluid to the energy storage media. The system further includes two or more rotational directional control valves, in which at least one rotational directional control valve is positioned on each side of the accumulator unit. Each rotational directional control valve includes multiple ports. The system also includes two or more variable displacement hydraulic rotational units. At least one variable displacement hydraulic rotational unit is positioned adjacent each of the rotational directional control valves.

An energy production system including a hydraulic turbine system having undesirable electrical power output setpoints and identified safe electrical power output setpoints, an energy storage system, a connection connected to the energy storage system and to an electric machine of the hydraulic turbine system, and further connected to an AC power network, a device for determining the state of charge, a control circuit controlling a transfer of electrical power between the connection and the energy storage system, configured to receive an electrical power setpoint value (Reps) and configured to determine that this received electrical power setpoint value belongs to the undesirable electrical power output setpoint values to generate an electrical power transfer setpoint value (Epts), and an actual electrical power output setpoint value (Aepos) belonging to the safe electrical power output setpoint values, satisfying the relationship Reps=Epts+Aepos.