Scientific Research and Essays

  • Abbreviation: Sci. Res. Essays
  • Language: English
  • ISSN: 1992-2248
  • DOI: 10.5897/SRE
  • Start Year: 2006
  • Published Articles: 2768

Full Length Research Paper

Real time digital simulation of shunt active filter for mitigation of current harmonics with P-Q theory

1Department of Electrical and Electronics Engineering, K.S.R. College ofEngineering, Tiruchengode, Tamilnadu, India. 2Department of Electrical and Electronics Engineering, Institute of Road andTransport Technology, Erode, Tamilnadu, India.
Email: [email protected]

  •  Accepted: 09 July 2013
  •  Published: 11 July 2013


The main objective of this paper is to develop PI and Fuzzy logic controllers to analyze the performance of instantaneous active and reactive power (p-q) control strategy for extracting reference currents of shunt active filters under balanced, un-balanced and balanced non-sinusoidal conditions. When the supply voltages are balanced and sinusoidal, then all controllers converge to the same compensation characteristics. However, when the supply voltages are distorted and/or un-balanced sinusoidal, these control strategies result in different degrees of compensation in harmonics. The p-q control strategy with PI controller is unable to yield an adequate solution when source voltages are not ideal. Extensive simulations were carried out; simulations were performed with balance, unbalanced and non sinusoidal conditions. Simulation results validate the dynamic behavior of Fuzzy logic controller over PI controller. The 3-ph 4-wire shunt active filter system is also implemented on a real time digital simulator (RTDS Hardware) to further verify its effectiveness. The detailed simulation and RTDS Hardware results are included.


Key words: Harmonic compensation, shunt active filter (SAF), P-Q control strategy, PI controller, fuzzy controller, RTDS hardware.