Dynamic equivalents of power systems with online measurements. Part 1: theory

Dynamic equivalents (DE) can reduce the computing effort and emphasise the main characters of a power system. A DE model has been developed in which identifiability is studied. Identifiability has not only a theoretical meaning, but also practical value. It is shown that some parameters of the model are unidentifiable when using only the steady-state data before disturbance and during disturbance, but identifiable when using only the steady-state data before disturbance and during disturbance, but identifiable when using only the data before and during disturbance, but identifiable when utilising the data after disturbance.