Two-Degrees-of-Freedom Control System of Superconducting Maglev Train

Abstract

This paper deals with the two-degrees-of-freedom control system of Superconducting Maglev train. In the Yamanashi Maglev Test Line, LSM is controlled with the PI control system that is composed of velocity controlled loop and phase locked loop. Over the past two years this control system has had a good performance from high speed to low speed.
From a riding comfortable point of view, we have to improve it at the point of changing acceleration. Generally we reduce the feedback gain of velocity controlled loop to lessen overshoot that is the cause of deterioration of riding comfort. However with this method, not only the characteristics of tracking performance but also the characteristics of disturbance rejection is changed. Running tests have shown the good performance of disturbance rejection, therefor the changing of that performance is not so good. Because of this reason, we apply the two-degrees-of-freedom control system to lessen overshoot. With this system, we are able to adjust the tracking performance apart from disturbance rejection.
In this paper, firstly we report the configuration and basic characteristics of the two-degrees-of-freedom control system and then we show the experimental results at the Yamanashi Maglev Test Line.