This paper focuses on the analysis of

traditional decoupled d-q vector control approaches for control

of power transmission in a HVDC light system. The paper

presents steady-state and transient models of a HVDC light

system in a d-q reference frame. The steady-state model is used

to study the steady-state characteristics of the HVDC light under

the decoupled d-q vector control strategy. The transient model is

used to develop close-loop control mechanisms for control of the

HVDC light system. A weakness of traditional control

mechanism is analyzed through theoretical study and computer

simulation.