A study of superconducting levitated energy storage system without mechanical contacts

近年来，有效地节约能源已变得非常重要。因此，剩余电力的节能技术是非常重要的。飞轮储能系统是一种有价值的节能技术。与其他储能系统相比，该系统结构简单，节能程度高。此外，具有强钉住力的高温超导体也可用于此应用。在本研究中，我们提出了一种微型飞轮储能系统。将h -∞控制方法应用于飞轮储能系统。讨论了储能系统的动力学特性。我们已经开发了一个原型微型飞轮储能系统。该系统由一个带有飞轮盘的转子和一对hmb组成。转子测量270毫米长，直径24毫米与飞轮盘（直径100毫米）。带飞轮的转子质量为1.2 kg，由两个永磁体（pm）之间的斥力支撑。在我们的体系中，两家中小企业比两家大企业更具主导地位。这意味着amb协助中小企业。为了抑制转子在谐振转速附近的振动，对两轴电机进行了h∞控制。除谐振转速附近外，SMBs主要抑制转子振动。对smb的超导体进行了场冷却。此外，还采用了一种无偏置电流的非线性控制方法。即在转子控制中，沿各轴相对的两个电磁铁不同时受到驱动电流的激励。进一步研究了无控制飞轮系统。这个系统几乎等于上面提到的系统。此外，还研究了超导轴承刚度和阻尼的改进技术。研究结果表明，无控制飞轮系统是一种有效的储能系统。

Recently, saving energy effectively has become very important. Thus, energy-saving technology for surplus power is very important. A flywheel energy storage system is one of the valuable energy-saving technologies. The system is very simple and characterized by high energy saving compared with other energy storage systems. Also, high temperature superconductors with strong pinning force are useful for this application.In this research, we propose a miniature flywheel energy storage system. HMBs with H-infinity control method are applied to the flywheel energy storage system. The dynamics of the energy storage system is discussed.We have developed a prototype miniature flywheel energy storage system. The system consists of a rotor with a flywheel disk and a pair of HMBs. The rotor measures 270 mm in length and 24 mm in diameter with a flywheel disk (100 mm in diameter). The rotor mass with the flywheel is 1.2 kg, which is supported by the repulsive force between two permanent magnets (PMs). In our system, the two SMBs are more dominant than the two AMBs. This means that the AMBs assist the SMBs. In order to suppress the rotor vibration near the resonance rotation speed, H-infinity control is applied to the two-axis AMBs. Except near the resonance rotation speed, the SMBs mainly suppress the rotor vibration. The superconductors of the SMBs were field-cooled. Moreover, a nonlinear control method without bias corrents is applied to the AMBs. That is, in the rotor control, the two electromagnets facing each other along each axis aren't excited by the driving currents at the same time.Furthermore, a flywheel system without control is studied. The system is almost equal to the system mentioned above. Also, improvement techniques for the bearing stiffness and damping of the superconducting bearings are studied. From this study, it is found that the flywheel system without control is useful for energy storage.