A VSC-HVDC Fuzzy Controller for Improving the Stability of AC/DC Power System

A VSC-HVDC Fuzzy Controller for Improving the  Stability of AC/DC Power System


Abstract —This paper puts forward an auxiliary fuzzy logic
controller for the Voltage Source Converter based HVDC
transmission system, VSC-HVDC, to improve the stability of the
AC/ DC system by damping the oscillation effectively after
disturbance. The fast control capability of the VSC-HVDC and the
process of area mode oscillations are analyzed. No detailed model
of the system is required for the design of the proposed control
scheme. The controller judges the operation states and the control
effect and accordingly adjusts its active power order in an adaptive
way by using fuzzy rules, so as to damp out the area mode
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.

Keywords: VSC-HVDC; fuzzy logic control; tie-line oscillation


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