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HVDC light is more and more concerned recently to improve power system stability due to controllability of its IGBT valve. In this paper, a model of HVDC light system is established and analyzed. And a nonlinear control to enhance HVDC Light system stability is proposed. The digital simulation results show that the proposed nonlinear control is effective to damp system oscillations and enhance system stability. Furthermore, digital simulation studies are conducted using the well-established PSCAD/EMTDC software package to show the effectiveness of the proposed nonlinear controller in damping oscillations when plow flow reversed.