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柔性直流输电系统(high voltage direct current transmission system based on voltage source converter， VSC-HVDC)具有功率独立可控、可向无源负荷供电、能够抑制可再生能源并网发电功率波动等技术优势。该文研制了一套背靠背的VSC-HVDC实验样机，基于输电系统的工作机理设计了电压源换流器(voltage source converter，VSC)的电气参数及其控制策略，设计了输电系统控制功能协调的系统级控制与功率跟踪的换流器级控制结合的分层控制结构。在并网输电和向无源负荷供电工况下，对样机运行特性进行实验，结果表明，该样机并网输电时具备有功、无功功率独立可控，以及功率反转的能力，同时具有向无源负荷供电功能，且动态性能良好、运行稳定，验证了样机系统设计的正确性。“,”The high voltage direct current transmission system based on voltage source converter (VSC-HVDC) has advantages in that power can be controlled independently, power can be supplied to passive load and power fluctuations from the renewable energy field can be suppressed. This paper developed a prototype of VSC-HVDC system with back to back structure, in witch the parameters and control strategies of the voltage source converter (VSC) were designed based on the system’s principle, the hierarchical structure was designed with layers of control objectives and power control functions. The operation characteristics of the prototype were tested on the conditions of grid connection and power supply to passive load. The results show that the prototype has abilities of supplying power to passive load, and the power can be controlled independently and inversely when system is connected to grid, meanwhile, the correctness of the prototype designing is validated by dynamic performance and stable operation.