Recent developments in synchronized voltage phasor measurements has made wide area protection and control schemes possible. Recently, wide area disturbances has forced utilities to design protection and control schemes to protect the power system from angular, voltage and frequency instabilities, in order to avoid a complete or partial blackout. A key step in designing or testing this types of schemes is of course computer simulation. In this paper, the development of the necessary components to properly simulate wide area disturbances, such as an exciter, a power system stabilizer, a voltage/frequency dependent load and a phasor measurement unit is done using ATP/EMTP. The New England 39-bus system is used as a case study to validate the developed components.