This

paper proposes an optimal control strategy for an HVdc light system

using a direct current vector control mechanism. The proposed

approach is compared with the traditional vector control

method for different HVdc control requirements, such as active

power, reactive power, and grid voltage support control. A limitation

of the conventional control mechanism is analyzed through

a theoretical study and computer simulation. Closed-loop control

evaluation demonstrates that the proposed approach works well

for HVdc light system control both within and beyond the physical

constraints of the system, such as rated power and saturation of

pulse width modulation (PWM).