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Impacts of Wind Generators on the Dynamic Performance of Power Systems nected; voltage drops due to a fault; changes in prime mover mechanical power or exciter voltage, and so on. The power system is considered stable if the system reaches a new steady state and all generators and loads that were connected to the system before the disturbance are still connected. The original power system is considered unstable if, in the new steady state, loads or generators are disconnected. The objective of this chapter is to conduct different case studies to allow the capture of all possible forms of the instability mechanism caused by the dynamics of the different devices comprising a benchmark power system, such as loads, generators, wind turbines equipped with induction generators, Automatic Voltage Regula- tors (AVRs) and Power System Stabilisers (PSSs), with high accuracy using an accurate time-domain technique. An understanding of dynamic voltage instability should enable the development of ap- eration is P G =18408.00 MW. The line loss in the system is 152.2 MW. Generators G 1 to G 9 are the equivalent representation of the NETS generator whilst machines G 10 to G 13 represent the genera- tion of the NYPS. Generators G 14 to G 16 are the dynamics equivalents of the three neighboring areas connected to the NYPS. There are three major transmission corridors between NETS and NYPS connecting buses 60-61, 53-54, and 27-53. All these corridors have double-circuit tie lines. In steady state, the tie-line power exchange between NETS and NYPS is 700 MW in total. The NYPS is required to import 1500 MW from area 5. The system and generator data are given (Pal & Chaudhuri, 2005). MODELLING OF POWER SYSTEMS Power system modelling requires the modelling