Analytical Modeling of the Closed-Loop Operation and Quench Behavior for Superconducting Electrodynamic Suspension Train

Superconducting electrodynamic suspension (EDS) as one of the most promising ultrahigh-speed transportations has been widely followed with great interest in the past decades, and service safety under high-speed operation is always the focus of academic attention. Thereinto, an evaluation method of quench behavior can effectively reduce and even avoid the risky accident in advance for the EDS train, possessing in a more realistic sense. In this article, we established an analytical model for the superconducting EDS with cross-connection, fully considering the arbitrary attitudes of the bogie and closed-loop operation of onboard superconducting magnets (SCMs), on the basis of spatial coordinate transformation and dynamic circuit theory. Meanwhile, the data of the finite-element model and experiment, regarded as references, validate the availability of the proposed analytical model. Afterward, we systematically analyzed and revealed the end effect caused by the SCMs and characteristics of 3-D electromagnetic interactions from the perspective of normal operation and quench conditions, respectively. The results show that the quench behaviors of SCMs have a significant influence on the operating characteristics of trains and are dependent upon the installation position of the disabled SCMs, providing an invaluable tool for the studies of the train dynamics under quench conditions.