A Two-Stage Isolated AC-DC Converter for More Electric Aircraft

فاقد چكيده فارسي

Nowadays, with the dramatic increase in the use of power electronics in industrial applications, the use of active power electronic converters has become increasingly popular in more electric aircraft (MEA) application. In airplanes due to presence of sensitive loads and low space, the use of active three-phase rectifiers instead of conventional transformer rectifier units (TRUs) becomes more interesting. In this paper, a two-stage converter topology with a VIENNA rectifier in the first stage and DC-DC converter with high frequency transformer in the second stage is proposed for power rectification and obtain a stepped-down and regulated DC 28 V output voltage. In the proposed topology the stepped-up DC voltage of VIENNA stage becomes pulsating voltage by a DC-DC converter and will be stepped-down by a high frequency transformer. The resulting topology has a more compact design and higher efficiency and lower total harmonic distortion (THD) with output isolation compared to conventional TRUs. The control scheme for VIENNA rectifier is a double-loop current-voltage controller based on hysteresis current control that is a simple scheme and more advantageous compared to other control methods for rectifier units. Simulation results are included to verify the performance of the proposed rectifier for converting the 115V/400Hz three-phase input voltage to 28V DC voltage with a power factor of 0.996 and input current total harmonic distortion (THD) about 4% and conversion efficiency more than 95 percent.