Real-time power system linear model identification: instrumentation and algorithms

In the paper the solution of the measuring system for power system linear model identification is presented. Power signal properties which influence signal processing methods are discussed. It is pointed out how important is the system impedance information to system description, especially if the system is loaded with nonsinusoidal currents. Two methods of impedance measurements, assuring good quality of impedance estimation for the non-stationary power system are discussed. The presentation is illustrated with experimental data from real system measurements.