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The reference current errors of instantaneous pq-based methods for active filters are analyzed in this paper. First, the error function in steady-state conditions is derived and a numerical harmonic analysis is performed. A theoretical harmonic analysis is developed to carry out the underlying reasons that causes the error harmonics due to the singularity of the harmonic spectrum. Finally, some examples of application are reported.

Power factor correction in industrial facilities has become a problem nowadays because of the widespread use of power electronic equipment. Frequently, single tuned filters must replace capacitors used to increase the power factor in order to avoid resonances. This paper presents an analytical technique used to improve power factor and reduce harmonics. An orthogonal decomposition of currents in three-phase system is applied in order to compute the optimum power factor compensator for each individual problem.