Reactive Power Measurement in Sinusoidal and Nonsinusoidal Conditions by Use of the Walsh Functions

This paper presents a new modified Walsh function (MWF) based method for measuring of reactive power (RP) in sinusoidal as well as in noise conditions. Proposed method simplifies the multiplication procedure to evaluate the reactive components from instantaneous power signal using peculiar properties of the WF. One of the advantages of proposed measurement approach is that in contrast to the known existing methods which involve phase shift operation of the input signal, the proposed technique does not require the time delay of the current signal to the 7112 with respect to the voltage signal. Another advantage is related to the computational saving properties of the proposed approach coming from use of the Walsh Transform (WT) based signal processing method. Proposed method eliminates an influence of the prevalent third order current harmonics to and reduces the effect of the highest order current harmonics on the RP measurement results. Validity and effectiveness of the suggested method for evaluation of the RP components of the electrical power have been tested by use of a simulation tool developed on the base of 'Matlab ".

[1]  W. Fairney.  Reactive power-real or imaginary? , 1994 .

[2]  Alessandro Gandelli,et al.  Energy meter testing based on Walsh transform algorithms , 1994, Conference Proceedings. 10th Anniversary. IMTC/94. Advanced Technologies in I & M. 1994 IEEE Instrumentation and Measurement Technolgy Conference (Cat. No.94CH3424-9).

[3]  A. Ozdemir,et al.  Low cost mixed-signal microcontroller based power measurement technique , 2004 .

[4]  Michael J. Devaney,et al.  Reactive power measurement using the wavelet transform , 2000, IEEE Trans. Instrum. Meas..

[5]  Mladen Kezunovic,et al.  New approach to the design of digital algorithms for electric power measurements , 1991 .

[6]  Bai liyun,et al.  Sample rate conversion using Walsh-transform for radar receiver , 2005, 2005 Asia-Pacific Microwave Conference Proceedings.

[7]  M.E. El-Hawary,et al.  Effects of harmonic distortion on the active and reactive power measurements in the time domain: a single phase system , 2001, 2001 IEEE Porto Power Tech Proceedings (Cat. No.01EX502).

[8]  K. Dimililer,et al.  The Walsh Functions Based Method for Reactive Power Measurement , 2007, IECON 2007 - 33rd Annual Conference of the IEEE Industrial Electronics Society.

[9]  Branislav Djokic,et al.  A high performance frequency insensitive quadrature phase shifter and its application in reactive power measurements , 2000, IEEE Trans. Instrum. Meas..

[10]  D.G. Hart,et al.  Methods for electric power measurements , 2002, IEEE Power Engineering Society Summer Meeting,.

[11]  Emmanuel Ifeachor,et al.  Digital Signal Processing: A Practical Approach , 1993 .

[12]  Tommy W. S. Chow,et al.  Measurement and evaluation of instantaneous reactive power using neural networks , 1994 .

[13]  Leopoldo García Franquelo,et al.  Reactive power and energy measurement in the frequency domain using random pulse arithmetic , 2001 .