Introduction  The“Internet plus”Project between urban and industrial park in support of the revolution of power consumption(abbr.“Internet +”project) successfully pilots multi-voltage multi-terminal flexible DC distribution network technology.

  Method  In this article, the overall design plan was discussed. The principle of JS I converter station, which applied self fault clearance MMC based on cross clamped of IGCT devices, and JS II, TJ converter station, which applied half-bridge topology MMC and DC circuit breaker were described. The layout of JS I and JS II, which shared identical converter capacity was introduced.Their covered area and costs were compared.

  Result  The results show that both JS I and JS II converter station are functional available and JS I station is slightly more land-saving and cost-saving.

  Conclusion  As an important part of the“Internet +”project,the implementation of JS I, JS II and TJ converter station successfully test both the IGCT converter valve with fault self-cleaning capability and the half-bridge IGBT converter valve, successfully test DC breakers with different principles, which can be regarded as an important basis for device standardization.