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This paper discusses the experience of the authors in using Matlab power system toolbox for the transient stability studies of an AC/DC interconnection power system. The modified two-area power system model with HVDC Link is used in the investigation. It is shown that as the AC line became weaker (as compared to the DC line), the transient stability of the interconnected AC/DC system is negatively affected. The use of power system stabilizer (PSS) was critical in maintaining the stability of the system.