轻型直流输电(VSC-HVDC)是建立在传统直流输电基础上，以脉宽调制(PWM)方式驱动全控型电压源换流器的新型技术。由于这种换流器的功能强、体积小，可以减少换流装置，简化换流结构，故而称轻型直流输电。它除了具有传统高压直流输电优点外，还可以向无源网络供电，连接分散电源，同时能起到静止无功补偿作用等优点。 本文首先阐述了轻型直流输电的背景及研究意义。其次，介绍了VSC-HVDC在静止三相abc坐标系下的数学模型，以及在同步旋转d-q坐标系下系统双闭环控制器的设计方法。再次，利用MATLAB软件搭建向无源网络供电的VSC-HVDC仿真模型，为轻型直流输电实验平台的搭建做理论指导。最后，搭建了小型向无源网络供电的VSC-HVDC物理实验平台，实验平台主要包括硬件和软件的设计，主要以TI公司型号为TMS320F2812的DSP为主控芯片，对主电路和驱动电路进行控制。

The VSC-HVDC is established on the basis of the traditional dc transmission，which uses the pulse width modulation (PWM) to drive full controlled voltage source inverter type of new technology. Since the inverter not only has the strong function and small size，but also reduces the converter equipment and simplifies the structure of converter. So it is called VSC-HVDC. Apart from the advantages of traditional HVDC，it can also supply power to passive network and connect scattered power，and also has static reactive compensation effect，etc. At the same time，it can be used as SVG. This article introduces more about the technology of the study of the background，the principle of light dc transmission，the simulation and experiment. Firstly，the paper expounds the background of VSC-HVDC and the research significance. Secondly，it establishes the VSC-HVDC static mathematical model of three-phase coordinate system. In a synchronous rotating d-q coordinate system，dual closed loop control system is introduced in detail below，including the outer control and inner control. Thirdly，the VSC-HVDC simulation model is designed on MATLAB. The simulate experimental results and theories are given，at the same time they will be helpful to the physical design. Finally，the small physical experimental is established. DSP of TI Company which type is TMS320F2812 is used as the main control chip.