Abstract
Recently, the suppression of the harmonic component in the electric power system has become an important problem. In this paper, we analyze compensating characteristics of a series-shunt active power filter by simulation and experiment when source voltage or load current becomes unbalanced. The harmonic and unbalanced voltages are detected and compensated in a series active filter using dq0 transformation. The harmonic and unbalanced currents are detected and compensated in a shunt active filter using pq-theory. The results of analysis show that the THD of the compensated voltage is 1.0% by simulation and 8.3% by experiment. The THD of the compensated current is 3.0% by simulation and 7.2% by experiment. It is shown that the series-shunt active filter can compensate the voltage and the current simultaneously and it has excellent compensating characteristics even when unbalanced components occur in the electric power system.
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