STLS Algorithm for Power-Quality Indices Estimation

This paper introduces a new two-stage, self-tuning least-squares digital signal processing algorithm for power-quality (PQ) indices estimation according to the power components and PQ indices definitions given in the IEEE Standard 1459-2000. The algorithm is based on the nonrecursive least error square technique accompanied with an tuning procedure, which generally improves the algorithm properties: the measurement range, the immunity to a random noise, convergence, and accuracy. The presented algorithm models typical signal distortions and it can be used for the real-time PQ indices estimation. In order to estimate signal spectra and fundamental frequency, current and voltage signals are processed in the first algorithm stage, whereas in the second stage, the power components and PQ indices are calculated based on the results obtained from the first stage. To demonstrate the efficiency of the proposed algorithm, the results of computer simulated and laboratory tests are presented.

[1]  Loi Lei Lai,et al.  Real-time frequency and harmonic evaluation using artificial neural networks , 1999 .

[2]  A. A. Girgis,et al.  Measurement of the parameters of slowly time varying high frequency transients , 1989 .

[3]  Sanjib Kumar Panda,et al.  Fast estimation of voltage and current phasors in power networks using an adaptive neural network , 1997 .

[4]  H. Wayne Beaty,et al.  Electrical Power Systems Quality , 1995 .

[5]  Michel Meunier,et al.  Detection and measurement of power quality disturbances using wavelet transform , 2000 .

[6]  Leszek S. Czarnecki,et al.  Energy flow and power phenomena in electrical circuits: illusions and reality , 2000 .

[7]  G. T. Heydt,et al.  Power Quality Engineering , 2001, IEEE Power Engineering Review.

[8]  Alan V. Oppenheim,et al.  Digital Signal Processing , 1978, IEEE Transactions on Systems, Man, and Cybernetics.

[9]  A. E. Emanuel,et al.  A survey of North American electric utility concerns regarding nonsinusoidal waveforms , 1996 .

[10]  A.E. Emanuel,et al.  The apparent power concept and the IEEE standard 1459-2000 , 2005, IEEE Transactions on Power Delivery.

[11]  A. E. Emanuel,et al.  On the definition of power factor and apparent power in unbalanced polyphase circuits with sinusoidal voltage and currents , 1993 .

[12]  P. S. Filipski,et al.  Apparent power: a misleading quantity in the non-sinusoidal power theory: are all non-sinusoidal power theories doomed to fail? , 2007 .

[13]  J. Arrillaga,et al.  Power quality following deregulation , 2000, Proceedings of the IEEE.

[14]  A.E. Emanuel,et al.  Summary of IEEE standard 1459: definitions for the measurement of electric power quantities under sinusoidal, nonsinusoidal, balanced, or unbalanced conditions , 2004, IEEE Transactions on Industry Applications.