A model-based controller for a three-phase four-leg shunt active filter with homopolar current compensation

R. E. Torres-Olguin, G. Escobar, A. A. Valdez, M. F. Martinez-Montejano

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

6 Scopus citations

Abstract

This paper presents a model-based controller for a three-phase four-wire shunt active filter which uses a four-leg topology to implement the voltage source inverter. The proposed controller is able to compensate the homopolar current component due to an unbalanced load, thus, reducing the current flowing to the source via the neutral line, which is caused by distorting loads connected between a phase and the neutral line. In addition to the homopolar current compensation, the controller is able to compensate the usual issues found in three-wire systems, that is, reactive power and harmonic distortion in the general case of distorted and unbalanced source voltages and load currents. The complete model in (fixed frame)αβγ-coordinates is presented. It is shown that the γ component of the three legs input control acts in cooperation with the input control of the fourth leg to achieve the homopolar current compensation. This cooperative work has the effect of enlarging the range of the effective control action. Additionally, this opens the possibility of alternative modulation schemes for four-leg topologies. Numerical tests are provided to illustrate the benefits of our solution.

Original languageEnglish
Title of host publicationProceedings of the 11th IEEE International Conference on Power Electronics Congress, CIEP 2008
Pages63-68
Number of pages6
DOIs
StatePublished - 2008
Externally publishedYes
Event11th IEEE International Conference on Power Electronics Congress, CIEP 2008 - Cuernavaca, Morelos, Mexico
Duration: Aug 24 2008Aug 27 2008

Publication series

NameInternational Power Electronics Congress - CIEP

Conference

Conference11th IEEE International Conference on Power Electronics Congress, CIEP 2008
Country/TerritoryMexico
CityCuernavaca, Morelos
Period08/24/0808/27/08

Keywords

  • Active filters
  • Adaptive control
  • Four-leg voltage
  • Source inverters

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