WIDE FREQUENCY BAND POWER SYSTEM LINEAR AND LINEAR TIME- VARIANT MODEL IDENTIFICATION - SIGNAL PROCESSING PROBLEMS

The paper deals with the LTI/LTV power system models and their experimental verification. The frequency dependent system impedance is used for power system harmonics studies. As a voltage/current power system transfer function it explains well harmonics related phenomena observable in real systems. With very accurate impedance measurements power system nonlinearity can be observed. The nonlinearity manifests as a system time- variance for which LTV (linear time varying) model can be used. New model improves the power system description. The problems of such the model identification and verification are discussed in the paper.

[1]  K. Srinivasan,et al.  On separating customer and supply side harmonic contributions , 1996 .

[2]  Leszek S. Czarnecki,et al.  On-line measurement of equivalent parameters for harmonic frequencies of a power distribution system and load , 1996 .

[3]  Neville R. Watson,et al.  Identification of harmonic sources of power systems using state estimation , 1999 .

[4]  Z. Staroszczyk,et al.  Time-dependent power systems impedance-interpretation and measuring problems , 1999, IMTC/99. Proceedings of the 16th IEEE Instrumentation and Measurement Technology Conference (Cat. No.99CH36309).

[5]  J. P. Rhode,et al.  Complete characterization of utilization-voltage power system impedance using wideband measurement , 1996, Proceedings of 1996 IAS Industrial and Commercial Power Systems Technical Conference.

[6]  Leszek S. Czarnecki,et al.  On-line measurement of equivalent parameters of distribution system and its load for harmonic frequencies , 1995, Proceedings of 1995 IEEE Instrumentation and Measurement Technology Conference - IMTC '95.

[7]  Paulo F. Ribeiro,et al.  Time-varying harmonics. I. Characterizing measured data , 1998 .

[8]  Z. Staroszczyk.  Problems in real-time wide band identification of power systems , 1998, IMTC/98 Conference Proceedings. IEEE Instrumentation and Measurement Technology Conference. Where Instrumentation is Going (Cat. No.98CH36222).