Design of integrative fuzzy logic damping controller of VSC-HVDC

Abstract

This paper design an integrative ancillary 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 synthetically adjusts its active power and reactive power order in an adaptive way by using fuzzy rules, so as to damp out the area mode oscillation. An IEEE 4-generator AC/DC power system is built in PSCAD. Integrative ancillary fuzzy logic controllers is designed in Matlab and interfaced with PSCAD. Simulation results have shown that the integrative controller can enhance the dynamic stability of interconnected power systems effectively and is robust to the variation of system operating conditions and oscillation modes.