Abslrocf-It is expected that, in future, utility semce providers will enforce more strict power factor and harmonic standards. Therefore, efforts are' being made so that power electronic system or any other load drawing reactive volt-amperes is made to appear as linear load drawing current in-phase with the utility voltage. One of the solutions towards this end is to employ active power fiters (APF). This paper presents a control technique for Unified Power Quality Conditioner (UPQC), which is B combination of series APF and shunt APF. A control strategy based on unit vector template generation is discussed in this paper with the focus on the mitigation of voltage harmonics present in the utility voltage. Simulation results based on SIMPOWERSYSTEM (SPS) of MATLAB/SIMULINK are presented to verify the effectiveness of the proposed control technique. The authors would like to thank Nahlral Sciences and Engineering Research Council of Canada (NSERC) and IREQ i Hydro-Quebec for prcwiding financial support for this research work. V. Khadkikar and A. Chandra are with Dkpmlement de gkllle klectrique, Ecole de Techologie Supkrieure, MontrU, Canada P. Aganval is with Depmment of Elechical Engineering, Indian Institute of Technology, Roorkce, India. A. 0. Barry is with Labomlaire de simulation de Rkseaux, IREQ, T. D. Nguyen is with Secteur Indwtriel et qualit& du service varenne, Canada. 6lechique. Hydro Quebec, Montrkal, Canada.
This paper deals with the steady state analysis of unified power quality conditioner (UPQC). The UPQC, a combination of shunt and series active power filter (APF), is one of the best solutions towards the mitigation of voltage sags and swells problems on distribution network. The mathematical analysis is based on active and reactive power flow through the shunt and series APF, wherein series APF can absorb or deliver the active power whereas the reactive power requirement is totally handle by shunt APF alone during all conditions. The derived relationship between source current and % of sag/swell variation shows shunt APF plays an important role in maintaining the overall power balance in the entire network. The digital simulation is carried out to verify the analysis done. The simulation results support the mathematical analysis. The effect of load VAR variation and the impact of % sag / swell on the kVA ratings of both shunt and series APF are also analyzed. This analysis can be very useful for selection of device ratings for both shunt and series APFs.
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