Investigation of Various PWM Techniques for Shunt Active Filter

Pulse width modulation (PWM) techniques have been the subject of intensive research for different industrial and power sector applications. A large variety of methods, different in concept and performance, have been newly developed and described. This paper analyzes the comparative merits of Sinusoidal Pulse Width Modulation (SPWM) and Space Vector Pulse Width Modulation (SVPWM) techniques and the suitability of these techniques in a Shunt Active Filter (SAF). The objective is to select the scheme that offers effective utilization of DC bus voltage and also harmonic reduction at the input side. The effectiveness of the PWM techniques is tested in the SAF configuration with a non linear load. The performance of the SAF with the SPWM and (SVPWM) techniques are compared with respect to the THD in source current. The study reveals that in the context of closed loop SAF control with the SVPWM technique there is only a minor improvement in THD. The utilization of the DC bus with SVPWM is also not significant compared to that with SPWM because of the non sinusoidal modulating signal from the controller in SAF configuration.

Authors:

• J. Chelladurai
• G. Saravana Ilango
• C. Nagamani
• S. Senthil Kumar

Keywords:

• Voltage source inverter
• Shunt active filter
• SPWM
• SVPWM
• Matlab/SIMULINK.

References:

[1] Joachim Holtz, "Pulse width Modulation-A Survey," IEEE
Trans.Industrial Electronics, Vol.39, NO.5, Dec1992, pp-410-420.
[2] Zhou, K., and Wang, D.: ÔÇÿRelationship between space-vector modulation
and three-phase carrier-based PWM: A comprehensive analysis-, IEEE
Trans. Ind. Electron., 2002, 49, (1), pp. 186-196.
[3] Van der Broeck, Skudelny, H.C., and Stanke, G.V.: ÔÇÿAnalysis and
realisation of a pulsewidth modulator based on voltage space vectors-,
IEEE Trans. Ind. Appl., 1988, 24, (1), pp. 142-150.
[4] Boys, J.T., and Handley, P.G.: ÔÇÿHarmonic analysis of space vector
modulated PWM waveforms-, IEE Proc. Electr. Power Appl., 1990, 137,
(4), pp. 197-204.
[5] J.W. Dixon, J. J. Garcia, and L. Moran, "Control system for three-phase
active power filter which simultaneously compensates power factor and
unbalanced loads," IEEE Trans. Ind. Electron., vol. 42, no.6, pp. 636-
641, Dec. 1995.
[6] Subhash Joshi, Aby Joseph and Gautam Poddar, "Active power factor
correction for highly fluctuating industrial load" in Proc. Of NPEC-
2003, held at IIT, Bombay.
[7] Takeshi Furuhashi,shigeru Okuma and Yoshiki Uchikawa. "A Study on
the Theory of Instantaneous Reactive Power", IEEE Trans,Industrial
Electronics,Vol 37,No1, February 1990,pp-86-90.
[8] Hyosung Kim and Hirofumi Akagi. "The Instantaneous Power Theory
on the Rotating p-q-r Reference Frames" IEEE, International conference,
Power Electronics and Drive Systems, July 1999,pp-422-427.
[9] Vasco Soares , Pedro Verdelho and Gil Marques. "An Instantaneous
Active and Reactive Current Component Method for Active
Filters."IEEE Trans,vol 15, No 4,July2000 ,pp- 660-669.
[10] Ambrish Chandra, Bhim Singh, B. N. Singh and Kamal Al-Haddad. "An
Improved Control Algorithm of Shunt Active Filter for Voltage
Regulation, Harmonic Elimination, Power-Factor Correction, and
Balancing of Nonlinear Loads" IEEE Trans, Power Electronics, Vol. 15,
No. 3, May 2000,pp- 495-507.
[11] Souvik Chattopadhyay, V.Ramanarayanan "Phase Angle Balance
Control for Harmonic Filtering of A Three Phase Shunt Active Filter
System" IEEE Proc,APEC,Vol 2,Marc 2002,pp-1087-1093.
[12] P. S. Sensarma, K. R. Padiyar, and V.Ramanarayanan "A Comparative
Study of Harmonic Filtering Strategies for a Shunt Active Filter"IEEE
Proc,Industry application conference,Vol 4,Oct 2000pp-2509-2516.