多电平单元串联电压源型变频器高压电源瞬时失电连续运行研究

高压变频调速系统现场应用复杂,工艺多样。在重要的大型工业系统中,高压电源系统有双备用,紧急互投等功能,当变频器对大功率的电机供电时,如果高压电源进行切换,将出现0.1s-1.5s左右的失电间隔, 要求变频器在失电间隔中能正常工作,且转速波动较小,达到系统在失电期间不出现剧烈振荡。对于多电平单元串联电压源型变频器,当通过对功率单元电容值的加大,PWM输出占空比减小的方法提高失电连续运行性能,其效果均不理想。在经过大量论证后,采用特殊的DSP控制逻辑,并利用旋转系统中的飞轮动能转换,取得实现变频器在高压瞬时失电时保持稳定运行。

Improving Kinetic Energy Storage for Vehicles through the Combination of Rolling Element and Active Magnetic Bearing

The demand for short term energy storage providing high power for electric and hybrid-electric vehicles is increasing drastically. Stationary FESS （flywheel energy storage systems） is established as UPS （uninterruptible power supply） and represent an emerging market. In contrast, mobile FESSs are currently only used in a few application, e.g., in motor sports. To enable a wider use in personal and public transportation the life-span of the flywheel＇s bearings needs to be increased significantly. This paper presents an alternative approach to extend the lifespan of the flywheel＇s bearings significantly by using a CREAMB （combination of rolling element and active magnetic bearings）.

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