Abstract: An adaptive cooperative control strategy based on improved virtual synchronous machine（VSM）

technology was used to improve the traction power supply system of urban rail transit. Firstly，the improved VSM

was used as an one-time control to make the urban rail trains have the external characteristics of synchronous

machine and certain inertia and damping support，thus improving the ability of the urban rail traction power supply system to cope with the changes of the traction network. Secondly，considering that virtual inertia and virtual damping can be dynamically adjusted by deviating the system frequency from the nominal steady-state frequency，an adaptive control method was proposed as a secondary control to dynamically adjust，thereby the fluctuation of the system was reduced. Then，in view of the different power supply distances and parameter settings among multiple traction substations（TSSs），multi-agent cooperative control was implemented by using local substations to sense the information between adjacent substations to achieve the consistency of frequency response in multiple TSSs under different parameters. Finally，the effectiveness of the proposed control strategy was verified by simulation results.

      Key words: urban rail traffic；traction power supply system；improved virtual synchronous machine（VSM）；

adaptive control；multi-agent cooperative；consistency