부산대학교 도서관

The subject of this article is a design approach of a two-level three-phase active front-end (AFE) converter with a power level rated at 20 kW and the DC-link voltage level of up to 800 V. By using discrete SiC MOSFETs characterized by low lead inductance and excellent dynamic properties it was possible to apply a relatively high switching frequency (60 kHz). An efficient microcontroller was used to implement an advanced control algorithm that includes, among others, a direct power control with space vector modulation (DPC-SVM) of both the active and reactive power components. Furthermore, noise-resistant grid synchronization is based on a double second-order generalized integrators with a frequency-locked loop (DSOGI-FLL) with a synchronous reference frame using a phase-locked loop (SRF-PLL). The paper presents the results of simulations and experimental tests.