STRUCTURE DESIGN OF THE HIGH POWER FLYWHEEL ENERGY STORAGE SYSTEM FOR WIND POWER FLUCTUATION SUPPRESSION
Wind power fluctuations have adverse impacts on power quality, such as grid voltage and system frequency. Flywheel energy storage system (FESS) will be needed at different locations in the wind farm, which can suppress the wind power fluctuation and add value to wind energy. Because of this background, we designed a FESS that can store up to 2.5 kWh of usable energy in 7.5 minutes at a maximum 24,000 rpm. At the core of the FESS is a carbon-fiber composite rim, supported by an aluminum alloy hub and steel shaft and with a permanent magnet motor/generator mounted on the shaft. The composite rim has only one ring press-fit on the hub with an interference fit. Both the hub outer diameter and the inner diameter of the composite rim are tapered with the same angle. Together the rim, hub, shaft and motor/generator assembly form the flywheel. Multiple flywheels can be interconnected in an array, or matrix, to provide various megawatt-level power capacities for the wind farm. Based on ANSYS software, the finite element model of the flywheel was built to calculate the stress and strain field at different rotating speed. The maximum theoretical rotational speed and the peripheral velocity of the flywheel can be obtained. The flexible modes of the rim-hub-shaft system were also analyzed by ANSYS. The results indicated that the flywheel could run at the rated speed of 24,000rpm safely.
wind power FESS press-fit stress strain flexible mode
Tang Changliang Dai Xingjian Zhang Kai Zhang Xiaozhang
Department of Engineering Physics, Tsinghua University, Beijing 100084, China
国际会议
大连
英文
79
2012-05-28（万方平台首次上网日期，不代表论文的发表时间）