TIME-DOMAIN BASED ACTIVE COMPENSATION STRATEGIES UNDER NONSINUSOIDAL CONDITIONS IN THREE-PHASE THREE-WIRE SYSTEMS
Journal Title: ANALELE UNIVERSITATII DIN CRAIOVA - Seria Inginerie electrica - Year 2011, Vol 35, Issue 35
Abstract
This paper deals with the peculiarities involved by the operation under nonsinusoidal voltage conditions on the generation of the reference compensating current in three-phase three-wire shunt active power filters. The total compensation of both current harmonics and reactive power is taken into consideration and the attention is mainly directed to the desired supply current after compensation. Two of the most common time-domain based approaches are analyzed in order to be improved for a proper implementation when the voltage waveform in the point of common coupling is distorted. The former is based on the concepts of the p-q theory of the instantaneous power and involves using the two-axes stationary reference frame to generate the reference compensating current. The latter does not require any reference frame transformation and allows calculating the non-active current in phase coordinates system. The whole active filtering system has been modelled under Matlab-Simulink environment and extensive simulations have been carried out to analyse the influence of the adopted compensation strategy on the filtering performance. The simulation results validate the specific algorithms for reference current generation under nonsinusoidal voltage conditions when two compensation purposes are imposed, either the achievement of a unity power factor or the perfect harmonics cancellation of the current.
Authors and Affiliations
Mihaela POPESCU, Alexandru BITOLEANU, Constantin Vlad SURU
Keywords
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