Power system dynamic equivalence based on a new model reduction technique

AbstractPower system dynamic equivalents play an important role in the effort to reduce the computational burden of the transient stability analysis of power systems. This paper proposes a new efficient practical algorithm for forming linear dynamic equivalents for power systems based on modal analysis. The main feature of the proposed method is that the accuracy of the equivalent model is greatly improved by converting a coordinate system representing the subsystem from the R‐J coordinate system of the main system to the reference generator D‐Q coordinate system of the subsystem. The order reduction is based on aggregation of similar modes and elimination of the inferior modes without significant effect on the frequency response of the subsystem. Thus the equivalent obtained by the proposed method can be used for both steady‐state and transient stability analysis studies.To verify the dynamic equivalent performance stability simulation results for a model power system composed of 16 generators also are shown.