This paper suggests a Shrinking Span Membership function to be utilized in very fact changing system just like VSC- HVDC system. In this particular work Mamdani controller as well as the Takagi-Sugeno controller are compared with exact same input function(Shrinking Span Membership) in simulation as well as on prototype hardware. Simulation result justify the. Takagi-Sugeno Controller gives better dynamic response then the Mamdani controller