Structural integrity of the flywheel of reactor coolant pump is important for safe operation of a nuclear power plant. A shrink-fit multi-ring flywheel is designed with a fall-off function, i.e., it will separate from...Structural integrity of the flywheel of reactor coolant pump is important for safe operation of a nuclear power plant. A shrink-fit multi-ring flywheel is designed with a fall-off function, i.e., it will separate from the shaft at a designed fall-off rotation speed, which is determined by the assembly process and the gravity. However, the two factors are ignored in the analytical method based on the Lame's equation. In this work, we conducted fall-off experiments to analyze the two factors and used the experimental data to verify the validity of the analytical method and the finite element method(FEM). The results show that FEM performs better than the analytical method in designing the falloff function of the flywheel, though FEM cannot successfully predict the strain variation with the rotational speed.展开更多
This paper presents a theoretical and experimental study on controller design for the AMBs in a small-scale flywheel energy storage system,where the main goals are to achieve low energy consumption and improved rotord...This paper presents a theoretical and experimental study on controller design for the AMBs in a small-scale flywheel energy storage system,where the main goals are to achieve low energy consumption and improved rotordynamic stability.A H-infinity optimal control synthesis procedure is defined for the permanent-magnet-biased AMB-rotor system with 4 degrees of freedom.Through the choice of design weighting functions,notch filter characteristics are incorporated within the controller to reduce AMB current components caused by rotor vibration at the synchronous frequency and higher harmonics.Experimental tests are used to validate the controller design methodology and provide comparative results on performance and efficiency.The results show that the H-infinity controller is able to achieve stable rotor levitation and reduce AMB power consumption by more than 40%(from 4.80 to 2.64 Watts)compared with the conventional PD control method.Additionally,the H-infinity controller can prevent vibrational instability of the rotor nutation mode,which is prone to occur when operating with high rotational speeds.展开更多
通过对风电系统和飞轮储能系统运行特性的分析,针对飞轮转子设计难以安装位置传感器的特殊性问题,提出一种基于自适应非奇异快速终端滑模观测器的飞轮储能无传感器控制策略,提高转子位置角估计精度。此外,针对飞轮储能系统参考功率指令...通过对风电系统和飞轮储能系统运行特性的分析,针对飞轮转子设计难以安装位置传感器的特殊性问题,提出一种基于自适应非奇异快速终端滑模观测器的飞轮储能无传感器控制策略,提高转子位置角估计精度。此外,针对飞轮储能系统参考功率指令滞后的问题,在无传感器控制基础上,引入自适应滤波算法作为飞轮储能控制系统的功率给定,以减小功率指令滞后现象。在Typhoon HIL 602+仿真平台进行实验验证,结果表明:飞轮储能系统运行性能良好,观测器具有优越的估计性能,能满足飞轮快速充放电并有效平滑风电功率波动的控制需求,同时提高储能利用率。展开更多
基金supported by the National Natural Science Foundation of China(No.51576125)
文摘Structural integrity of the flywheel of reactor coolant pump is important for safe operation of a nuclear power plant. A shrink-fit multi-ring flywheel is designed with a fall-off function, i.e., it will separate from the shaft at a designed fall-off rotation speed, which is determined by the assembly process and the gravity. However, the two factors are ignored in the analytical method based on the Lame's equation. In this work, we conducted fall-off experiments to analyze the two factors and used the experimental data to verify the validity of the analytical method and the finite element method(FEM). The results show that FEM performs better than the analytical method in designing the falloff function of the flywheel, though FEM cannot successfully predict the strain variation with the rotational speed.
基金supported by Thailand Science Research and Innovation and the National Research Council of Thailand under Grant RGU6280014.
文摘This paper presents a theoretical and experimental study on controller design for the AMBs in a small-scale flywheel energy storage system,where the main goals are to achieve low energy consumption and improved rotordynamic stability.A H-infinity optimal control synthesis procedure is defined for the permanent-magnet-biased AMB-rotor system with 4 degrees of freedom.Through the choice of design weighting functions,notch filter characteristics are incorporated within the controller to reduce AMB current components caused by rotor vibration at the synchronous frequency and higher harmonics.Experimental tests are used to validate the controller design methodology and provide comparative results on performance and efficiency.The results show that the H-infinity controller is able to achieve stable rotor levitation and reduce AMB power consumption by more than 40%(from 4.80 to 2.64 Watts)compared with the conventional PD control method.Additionally,the H-infinity controller can prevent vibrational instability of the rotor nutation mode,which is prone to occur when operating with high rotational speeds.
文摘通过对风电系统和飞轮储能系统运行特性的分析,针对飞轮转子设计难以安装位置传感器的特殊性问题,提出一种基于自适应非奇异快速终端滑模观测器的飞轮储能无传感器控制策略,提高转子位置角估计精度。此外,针对飞轮储能系统参考功率指令滞后的问题,在无传感器控制基础上,引入自适应滤波算法作为飞轮储能控制系统的功率给定,以减小功率指令滞后现象。在Typhoon HIL 602+仿真平台进行实验验证,结果表明:飞轮储能系统运行性能良好,观测器具有优越的估计性能,能满足飞轮快速充放电并有效平滑风电功率波动的控制需求,同时提高储能利用率。
