What is magnetic suspension technology?

The magnetic suspension technology is used in the FESS to reduce the standby loss and improve the power capacity. First, the whole system of the FESS with the magnetic levitation system is introduced, and the control diagrams of the charging/discharging processes are developed.

How to improve the energy storage capacity of the ups?

To enhance the energy storage capacity of the UPS, multiple FESS units are integrated into an independent power system. Thus, the cooperation control methods of multiple FESS units are important in improving the power conversion efficiency and precision.

What is a hybrid energy storage unit?

The hybrid energy storage unit combining the FESS and battery was applied to stabilize the load fluctuation of a shipboard microgrid , and the charge power reached 90 kW at the 36750 rpm rotational speed.

What is a flywheel energy storage system (fess)?

As a vital energy conversion equipment, the flywheel energy storage system (FESS) [, , , , ] could efficiently realize the mutual conversion between mechanical energy and electrical energy. It has the advantages of high conversion efficiency [6, 7], low negative environmental impact [8, 9], and high power density [10, 11].

What determines the energy storage performance in a 5-DOF?

Energy storage performance The charging and discharging performances are investigated based on the stable levitation control in 5-DoFs. The energy storage curves (shown by the blue line) during the two periods are demonstrated in Fig. 21, and the rotational speed decides the energy capacity.

How Fw rotor stably suspends at a balanced state?

At the initial state, the FW rotor's radial displacements are about −0.1 mm. Then, the FW rotor is levitated to the radial balanced positions by the AMB units when the steady value of radial displacement approaches zero. Therefore, the designed axial thrust-force PMB and AMB could ensure the FW rotor stably suspends at balanced states. Fig. 19.