Converter device, urban rail tractive power supply system, and control method for urban rail tractive power supply system

The invention relates to a converter device, an urban rail tractive power supply system, and a control method for the urban rail tractive power supply system. The urban rail tractive power supply system comprises a medium voltage network, a traction transformer, the converter device, and a DC contact network. The converter device comprises two current conversion units, and each current conversion unit comprises at least two parallel current conversion circuits. Each current conversion circuit is provided with a current conversion module in a series manner, and each current conversion module is formed by the parallel connection of at least two current conversion branch circuits. Each current conversion branch circuit is provided with a DC/AC converter and a DC electric reactor in a series manner. The power supply system is provided with a plurality of parallel DC/AC modules, achieves a purpose of enlarging the overall capacity of the power supply system through the parallel voltage-dividing characteristics, an