Natural strategy for dynamic equivalencing

In this paper a power system´s reduced order model is presented which is evaluated by simple calculations through data taken out from the steady state analysis. This type of equivalent is useful, especially where preserving a portion of an electrical region is relevant. The external network is reduced to a few boundary buses where equivalent generators are located. From the internal network point of view, preserving voltages at buses connected to the boundary ones help to improve the precision of the electromechanical transient. Results on a power system of the open literature are exhibited under different operating conditions, showing approximate response between the full and the reduced system.