the control system of the VSC-HVDC is one of the
most important ports of the Flexible HVDC. Most researchers
are mainly focus on the design of controllers and the control
methods of VSC-HVDC and pay less attention on the control
system structure of VSC-HVDC. Based on the introduction of
the of the basic control functions of the control system of
VSC-HVDC, this paper establish a five layer control structure of
the control system of VSC-HVDC including the DC system
control layer, pole control layer, converters control layer, valves
control layer and separate control layer. After emphasizing the
necessity to adopt hierarchical control architecture, the paper
describes the control functions and scope of each control layer at
details, the relationship between the layers. By setting a
preparatory scheme to realize the whole process of the control
system, it provides reference for the software implementation in
the VSC-HVDC control system.