Comparative analysis of shunt active filters in nonideal operating conditions

Four widely used shunt active filters, implemented by means of a DSP, are compared in nonideal operating conditions. Filters based on the instantaneous reactive power theory, on the synchronous frame theory, on the active power estimation theory and on the voltage processing and supply current reaction (VPSC) are considered in nonideal conditions: the DSP delay is not negligible and the supply voltage is distorted and/or unbalanced. The comparison is based on analytic results and comparative simulations. The VPSC filter results the best choice in the considered operating conditions to overcome the nonideal supply conditions and the DSP implementation drawbacks