38 results about "Renewable energy storage" patented technology

Provided are lithium sulfur battery cells that use water as an electrolyte solvent. In various embodiments the water solvent enhances one or more of the following cell attributes: energy density, power density and cycle life. Significant cost reduction can also be realized by using an aqueous electrolyte in combination with a sulfur cathode. For instance, in applications where cost per Watt-Hour (Wh) is paramount, such as grid storage and traction applications, the use of an aqueous electrolyte in combination with inexpensive sulfur as the cathode active material can be a key enabler for the utility and automotive industries, providing a cost effective and compact solution for load leveling, electric vehicles and renewable energy storage.

A maximum power point tracking (MPPT) converter of a renewable energy storage system for tracking and extracting a maximum power from a renewable energy source to provide the maximum power to a DC link. The MPPT converter includes an MPPT controller changing a controlled variable for maximum power point extraction in proportion to a current slope of the renewable energy source, and an MPPT extractor extracting a maximum power from the renewable energy source and converting the extracted maximum power in response to a control of the MPPT controller. The controlled variable variation is set to a large value if the current slope is out of a predetermined current slope range, and the controlled variable variation is set to a small value if the current slope is within the predetermined current slope range.

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.

The invention discloses a high-performance oxygen-evolution CoSn2 / Ni3Sn4@NC / C composite catalyst and a preparation method and application thereof. The composite catalyst is prepared in the step that cobalt-nickel selenide nano-particles and nitrogen-doped carbon are supported on a carbon material together. The preparation method comprises the steps that after a nitrogen-containing small organic molecule compound, cobalt salt and nickel salt are subjected to liquid mixing, a solvent is evaporated, drying is conducted, the mixture of the nitrogen-containing small organic molecule compound, the cobalt salt and the nickel salt is subjected to first calcination in a protective atmosphere, a calcined product and a carbon material are uniformly stirred in a dimethylformamide-water mixed solutionand then subjected to a solvothermal reaction, and a product obtained after the solvothermal reaction is subjected to second calcination in a protective atmosphere to obtain the high-performance oxygen-evolution CoSn2 / Ni3Sn4@NC / C composite catalyst. The preparation technology is simple, low in cost and beneficial for industrial production; when used in a storage and conversion system of renewableenergy sources, such as water splitting or metal-air secondary batteries, the composite catalyst prepared by using the method has the advantages of being high in activity and high in stability; compared with a commercial RuO2 catalyst, the high-performance oxygen-evolution CoSn2 / Ni3Sn4@NC / C composite catalyst is higher in combination property and shows a good application prospect.

A hybrid renewable energy and energy storage system power supply system and a control method thereof integrate an electrochemical energy storage device with a mechanical energy storage device, and then match a solar photovoltaic and wind power generation system, and are grid-connected with a mains supply. In the control concept, an AC-DC is supplied preferentially to an AC-DC load, to reduce the conversion loss. The power supply system allows residence, base stations or computer rooms to be electricity self-sufficient, can conduct electric power trading with electric power companies when being grid connected with the mains supply, can avoid electric transient interruption during power outage and can also ensure a certain degree of power supply.