High-voltage flywheel energy storage system
a high-voltage flywheel and energy storage technology, applied in the direction of electrical equipment, dynamo-electric machines, supports/enclosements/casings, etc., can solve the problems of limited li-ion battery for large-scale energy storage, limited lead acid battery effectiveness for large-scale applications, and limited effectiveness of metal-air battery, so as to prevent plasma formation, reduce interior pressure, and prevent plasma formation
Active Publication Date: 2015-07-16
BC NEW ENERGY (TIANJIN) CO LTD
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Benefits of technology
This patent describes a high-voltage flywheel energy storage system that prevents plasma formation and electric arc discharge by using various methods such as providing a stator with an ionization avoidance barrier, drawing a partial vacuum, or isolating the motor winding from the flywheel housing. These methods aim to improve the safety and reliability of the system.
Problems solved by technology
However, the effectiveness of lead acid batteries for large-scale applications is limited by a short battery life cycle and a variable discharge rate.
The effectiveness of Li-ion batteries for large scale energy storage is limited, however, by a high manufacturing cost and by security concerns associated with large-scale implementation.
However, the effectiveness of Metal-Air batteries is limited by a very short life cycle and low efficiency (e.g., approximately 50%).
NaS batteries have high energy density but require high operating temperatures and have a relatively short life span.
However, it is not feasible to implement ECs on large-scale projects due to their high cost and low energy density.
Pumped hydro offers beneficial energy management and frequency regulation, but requires unique site requirements and large upfront capital costs.
A CAES uses roughly 40% as much gas as a natural gas power plant and similarly to pumped hydro, requires unique site requirements and large upfront capital costs.
In the case of high-voltage flywheel energy storage systems, power supplies present a raised risk of ionization and plasma formation on the windings in the motor / generator.
Such plasma formation can lead to electric arc discharge.
Method used
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[0025]It is noted that references in the specification to “one embodiment,”“an embodiment,”“an example embodiment,” etc., indicate that the embodiment described may include a particular feature, structure, or characteristic, but every embodiment may not necessarily include the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to effect such feature, structure, or characteristic in connection with other embodiments, whether or not explicitly described.
[0026]FIG. 1 is a perspective view of a high-voltage flywheel energy storage system 10, according to one aspect of the invention. As better shown in FIG. 2, high-voltage flywheel energy storage system 10 can include a flywheel housing 100 and a motor / generator 200. For the purpo...
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A high-voltage flywheel energy storage system to prevent ionization, plasma formation, and electrical arc discharge and corresponding method are provided. The high-voltage flywheel energy storage system prevents ionization, plasma formation, and electrical arc discharge by isolating the motor windings and motor end windings from the partial vacuum environment existing in the flywheel housing.
Description
BACKGROUND[0001]1. Field[0002]Embodiments of the present invention relate to energy storage systems. In particular, high-voltage flywheel energy storage systems store electrical energy as kinetic energy in a rotating flywheel. The stored energy can also be released from the high-voltage flywheel energy storage system.[0003]2. Background[0004]Large-scale energy storage has the potential to help modernize electrical power distribution. Energy storage can help manage intermittent renewable energy generation, electricity load shifting, black-start capabilities, electricity price fluctuations, and back-up power supply.[0005]There are currently several large-scale energy storage technologies that attempt to address these modernization challenges facing the energy storage industry, including: advanced batteries; electrochemical capacitors (EC); pumped hydro; compressed air; and flywheel energy storage systems.[0006]Due to low costs associated with lead acid batteries, they have been a popu...
Claims
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IPC IPC(8): H02K7/02
CPCH02K7/025H02K3/40H02K3/44H02K5/08H02K5/12H02K5/22H02K7/09Y02E60/16
Inventor VELTRI, JEFFREY A.MACNEIL, CODY J.
Owner BC NEW ENERGY (TIANJIN) CO LTD