The fast control capability of the VSC-HVDC and

the process of area mode oscillations are analyzed. An auxiliary

fuzzy logic controller designed in Matlab for the Voltage Source

Converter based HVDC transmission system, VSC-HVDC, to

improve the stability of the AC/ DC system is designed to enhance

stability by increasing the deceleration energy of oscillation.

Simulation results on the IEEE 4-generator AC/DC power

systems have shown that the controller can enhance the dynamic

stability of interconnected power systems effectively and is robust

to the variation of system operating conditions and oscillation

modes.