Improving the Shunt Active Power Filter Performance Using Synchronous Reference Frame PI Based Controller with Anti-Windup Scheme

In this paper the reference current for Voltage Source Converter (VSC) of the Shunt Active Power Filter (SAPF) is generated using Synchronous Reference Frame method, incorporating the PI controller with anti-windup scheme. The proposed method improves the harmonic filtering by compensating the winding up phenomenon caused by the integral term of the PI controller. Using Reference Frame Transformation, the current is transformed from om a - b - c stationery frame to rotating 0 - d - q frame. Using the PI controller, the current in the 0 - d - q frame is controlled to get the desired reference signal. A controller with integral action combined with an actuator that becomes saturated can give some undesirable effects. If the control error is so large that the integrator saturates the actuator, the feedback path becomes ineffective because the actuator will remain saturated even if the process output changes. The integrator being an unstable system may then integrate to a very large value, the phenomenon known as integrator windup. Implementing the integrator anti-windup circuit turns off the integrator action when the actuator saturates, hence improving the performance of the SAPF and dynamically compensating harmonics in the power network. In this paper the system performance is examined with Shunt Active Power Filter simulation model.

Authors:

• Consalva J. Msigwa
• Beda J. Kundy
• Bakari M. M. Mwinyiwiwa

Keywords:

• Phase Locked Loop (PLL)
• Voltage SourceConverter (VSC)
• Shunt Active Power Filter (SAPF)
• PI
• Pulse WidthModulation (PWM).

References:

[1] Boon Teck Ooi, "Advanced Distribution to Deliver Custom Power",
Electric Power Research Institute, Inc. (EPRI), 1991.
[2] C. Qiao, K. M. Smedley, "Three-phase Active Power Filters with
Unified Constant-frequency Integration control",
www.eng.uci.edu/~smedley/IPEMC-A185.PDF.
[3] C. Collombet, J. Lupin, J. Schonek, (1999), Harmonic disturbances in
networks, and their treatment, Schneider Electric-s "Collection
Technique", Cahier technique no.152,
http://www.schneiderelectric.com/cahier_technique/en/pdf/ect202.pdf.
Available online.
[4] U. Abdurrahman, R. Annette, L. S. Virginia, "A DSP Controlled
Resonant Filter for Power Conditioning in Three-Phase Industrial
Power--, System. Signal Processing, Volume 82, Issue 11, November
2002, pp 1743-1752.
[5] P. Fabiana, Pottker and B. Ivo, "Single-Phase Active Power Filters for
Distributed Power Factor Correction", PESC 2000.
[6] H.J. Gu, and H.C. Gyu, "New active power filter with simple low cost
structure without tuned filters", 29th Annual IEEE Power Electronics
Specialists Conference, Vol.1, pp 217-222, 1998.
[7] F. Hideaki, Y. Takahiro, and A. Hirofumi , "A hybrid Active Filter for
Damping of Harmonic Resonance in Industrial Power System", 29th
Annual IEEE Power Electronics Specialists Conference, pp 209-216
1998.
[8] M. Nassar, A. Kamal, D.A. Louis, "Nolinear Control Strategy Applied to
A Shunt Active Power Filter", Annual IEEE Power Electronics
Specialists Conference, 2001.
[9] M. Rukonuzzaman, and M. Nakaoka, "An Advanced Active Power
Filter with Adaptive Neural Network Based Harmonic Detection
Scheme, Annual IEEE Power Electronics Specialists Conference, 2001.
[10] L. San-Yi, W. Chi-Jui, "Combined compensation structure of a static
Var compensator and an active filter for unbalanced three-phase
distribution feeders with harmonic distortion", Electric Power System
Research 46, pp 243-250, 1998.
[11] A. V. Stankovic, and T. A. Lipo, "A Generalized Control Method for
Output-Input Harmonic Elimination for the PWM Boost Rectifier under
Simultaneous unbalanced Input voltages and Input Impedances", Annual
IEEE Power Electronics Specialists Conference, 2001.
[12] Y. Ye, M.Kazerani., V. H. Quintana., "A Novel Modelling and Control
Method for Three-Phase PWM Converters", Annual IEEE Power
Electronics Specialists Conference, 2001.
[13] C. Po-Tai, B. Subhashish, Dee pakraj M. Divan, "Hybrid parallel
active/passive filter system with dynamically variable inductance" US
Patent 1998
[14] G. Marian, "Active Power Compensation of the current harmonics based
on the instantaneous power theory" Department of electrical
Engineering, Dunarea de Jos" University of Galati, Domneasca Street
47, 6200-Galati Romania
[15] F. F. Gene, J. D. Powell, A. Emami-Naeini, Feedback Control of
Dynamic system, Pearson Education. Inc.1986, pp 186-190
[16] D. G. Holmes T. Lipo, "Pulse width modulation for power convertersprinciples
and practice" IEEE series on Power Engineering, pp 114-119,
2006.