Modeling of Electromagnetic Interference Noise on Inverter Driven Magnetic Bearing of Flywheel Energy Storage

Inverter driven magnetic bearing is widely used in the flywheel energy storage. In the flywheel energy storage system. Electromagnetic interference (EMI) couplings between the flywheel motor drive system and the magnetic bearing and its drive system produce considerable EMI noise on the magnetic bearing, which will seriously affect the control signal quality of the magnetic bearing drive system and the stability of the magnetic bearing, and bring significant challenges to the high-speed flywheel system. In order to effectively suppress the EMI noise of system coupling, EMI coupling mechanism between the motor drive system and the magnetic bearing system in the flywheel energy storage system is investigated. In this paper, the flywheel energy storage system with inverter driven magnetic bearing is taken as the research object, and the common-mode EMI generation mechanism and expression form of flywheel energy storage high-speed motor are investigated. The conducted EMI coupling source and common-mode EMI coupling paths between the main drive motor and the inverter driven magnetic bearing system in the flywheel energy storage system are investigated, and the high frequency model of the system common-mode EMI is proposed.