储能飞轮混合支撑系统的研究

发布时间：2018-11-09 20:25

【摘要】：飞轮储能系统具有高功率密度、高能量密度、充放电时间短、无污染、高效、寿命长等优点,一直是储能技术中的研究热点,有希望在电动汽车、电网调峰等领域应用,对节约能源、缓解环境污染问题有着重要的意义。如今飞轮储能正朝着大功率、大容量的方向发展,飞轮体积、重量和转速的增大直接影响支撑系统的寿命,从而限制了储能容量的提升,储能飞轮的支撑问题已经成为飞轮技术发展的瓶颈。本文针对储能飞轮的支撑系统进行了相关问题得研究。针对立式结构飞轮转子由于重量大而产生过大的静态载荷问题,采用永磁卸载的支撑方案,卸去需要混合支撑中机械轴承承受的大部分重量,提高机械轴承的寿命。比较了不同磁极排布的卸载轴承的力密度,得出了径向磁化永磁卸载轴承卸载能力强的结论。对所研究的飞轮转子径向磁化永磁卸载轴承进行了设计,利用有限元计算分析了结构参数与力密度和永磁体卸载质量比的关系。研究了飞轮支撑系统阻尼器对转子动力学行为的影响,利用拉格朗日方程对储能飞轮的转子-支撑系统进行了数学建模和求解方法的研究。以数学模型为基础计算了阻尼器阻尼系数对临界转速和模态阻尼比的影响。针对飞轮在临界转速的共振问题,研究了单阻尼器和双阻尼器的阻尼系数和作用位置对振动的抑制作用。计算分析了支撑系统电磁阻尼器结构和设计参数对阻尼系数的影响。为了避免3D有限元的计算的复杂性,用本质相同的平板型被动电磁阻尼器代替实际的磁环阻尼器进行计算分析。研究了阻尼器的阻尼系数与振动频率的关系,得出了阻尼系数的频率特性。为了实验研究支撑系统的效果,对径向位移传感器用线性差动变压器进行了设计和输出特性的研究。分析了线性差动变压器的原理和在电压源、电流源激励下的输出电压。最后对线性变压器的输出特性进行了有限元计算。
[Abstract]:Flywheel energy storage system has the advantages of high power density, high energy density, short charge and discharge time, no pollution, high efficiency and long life. It is of great significance to save energy and alleviate environmental pollution. Nowadays, flywheel energy storage is developing in the direction of high power and large capacity. The increase of flywheel volume, weight and speed directly affects the life of support system, which limits the increase of energy storage capacity. The support problem of energy storage flywheel has become the bottleneck of the development of flywheel technology. In this paper, the related problems of the energy storage flywheel supporting system are studied. Aiming at the problem of excessive static load caused by the heavy weight of the vertical flywheel rotor, a permanent magnet unloading support scheme is adopted to remove most of the weight of the mechanical bearing in the mixed support and to improve the life of the mechanical bearing. The force density of unloading bearing with different magnetic pole arrangement is compared, and the conclusion that the unloading ability of radial magnetized permanent magnet unloading bearing is strong is obtained. The radial magnetized permanent magnet unloading bearing of the flywheel rotor is designed, and the relationship between the structural parameters and the force density and the unloading mass ratio of the permanent magnet is analyzed by finite element method. The influence of the damper of flywheel support system on the dynamic behavior of rotor is studied. The mathematical modeling and solving method of rotor-support system of flywheel are studied by using Lagrange equation. Based on the mathematical model, the influence of damper damping coefficient on critical speed and modal damping ratio is calculated. Aiming at the resonance of flywheel at critical speed, the damping coefficient and position of single damper and double damper are studied. The influence of structure and design parameters of electromagnetic damper on damping coefficient of bracing system is calculated and analyzed. In order to avoid the complexity of 3D finite element calculation, a flat plate passive electromagnetic damper with the same essence is used instead of the actual magnetic ring damper for calculation and analysis. The relationship between damping coefficient and vibration frequency of damper is studied, and the frequency characteristic of damping coefficient is obtained. In order to study the effect of support system experimentally, the design and output characteristics of linear differential transformer for radial displacement sensor are studied. The principle of linear differential transformer and the output voltage under the excitation of voltage source and current source are analyzed. Finally, the output characteristics of linear transformer are calculated by finite element method.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH133.3

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