Improved injection current controller in single-phase shunt active power filters

Abstract

Nowadays shunt active power filters (SAPFs) are one of the most versatile and efficient solutions in the correction of the load power factor and the compensation of current harmonics generated by non-linear loads. The injection current controller, which must achieve that the compensation current track the reference one, is one of the basic components of the controller of a SAPF. This work presents a new method to control the injection current using a digital predictive algorithm, which allows an optimal compensation in stationary state and during variations in the load current and in the source voltage. Results obtained in simulation tests and experimentally on a laboratory prototype confirm and validate the proposed technique.