A control method for the interleaved active power filter with SiC-MOSFETs

Abstract

The interleaved inverter with simple structure, low output ripple, and flexible expansion has been widely used. A current control method for an interleaved active power filter (APF) with SiC-MOSFETs was proposed, which can compensate harmonic accurately with low output switching ripple. A mathematical model of a two-level interleaved inverter with two-module parallel was discussed. According to the mathematical model of the interleaved topology, a composite current controller with the fast repetitive control (FRC) as the outer loop and the PI controller as the inner loop is designed. The control method proposed is implemented on a 380V/75 A APF with a switching frequency of 50 kHz. In the experiments, The THD of grid current drops from 30.0% to 4.1%, and the time of dynamic full response is 10 ms that is half of the grid period, which verifies the feasibility of the interleaved APF and its control method.

Keywords

• Interleaved inverter
• Active power filter
• Repeated control