Analysis and design of the capacity and efficiency of a flywheel energy storage system |
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| Authors: | PI Zhenhong DAI Xingjian WEI Dianju XU Yang |
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| Affiliation: | 1 Department of Engineering Physics, Tsinghua University, Beijing 100084, China;
2 SINOPE Zhongyuan Petroleum Engineering Co Ltd., Puyang 457001, Henan, China |
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| Abstract: | In this paper, the energy and power characteristics of a flywheel energy storage system are analyzed. Current flywheel energy storage systems could store approximately 0.5-100 kW·h energy and discharge at a rate of 2-3000 kW. Here a design of a 100kW·h flywheel is proposed. By using a low speed steel flywheel rotor with a stress limit of 800 MPa, the energy density could reach 13-18W·h/kg. With such a stress level, however, the size of the flywheel could reach the meter scale, making it difficult to manufacture. To overcome such a challenge, a multi-disc axial connection structure design was proposed. The high-speed composite flywheel rotor was designed with 3 or 4 thin cylinders made from winding fber reinforced composite considering the radial stress optimization. Stress analyses indicated that both the 3-layer flywheel at a speed of 9000 r/min and the 4-layer flywheel at a speed of 15000 r/min would meet the structural strength requirements with an energy density at 50-70 W·h/kg. |
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| Keywords: | flywheel energy storage energy storage capacity charging/discharging power composite ?ywheel |
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