I. Introduction
In recent years, the demand for railway transportation has gradually increased. Virtual Coupling has attracted attention because it can greatly improve the utilization rate of railway lines [1]. Virtual Coupling remove the physical couplers between traditional trains and install a power system in each cabin. It obtains the information of adjacent trains and realizes virtual connection by means of vehicle-to-vehicle communication [2]. VCTs can be freely lengthened or shortened according to needs, which is very suitable for the operation scene of today's subway and can adapt to the fluctuation of passenger flow.