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

Nowadays, increasing use of power electronics at industrial applications, using 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 following a DC-DC converter and a high-frequency transformer in the second stage is proposed to obtain a regulated 28 VDC 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. In order to verify the effectiveness of the converter simulation results will be presented which show a power factor of 0.996 and input current total harmonic distortion (THD) about 4% and conversion efficiency more than 95 percent.

[1]  Gun-Woo Moon,et al.  New zero-voltage-switching phase-shift full-bridge converter with low conduction losses , 2005, IEEE Transactions on Industrial Electronics.

[2]  Chongming Qiao,et al.  A general three-phase PFC controller. I. For rectifiers with a parallel-connected dual boost topology , 1999, Conference Record of the 1999 IEEE Industry Applications Conference. Thirty-Forth IAS Annual Meeting (Cat. No.99CH36370).

[3]  K. Smedley,et al.  A general three-phase PFC controller. II. For rectifiers with a series-connected dual-boost topology , 1999, Conference Record of the 1999 IEEE Industry Applications Conference. Thirty-Forth IAS Annual Meeting (Cat. No.99CH36370).

[4]  Johann W. Kolar,et al.  A novel three-phase utility interface minimizing line current harmonics of high-power telecommunications rectifier modules , 1997, IEEE Trans. Ind. Electron..

[5]  D. Boroyevich,et al.  Comparison of prospective topologies for aircraft autotransformer-rectifier units , 2003, IECON'03. 29th Annual Conference of the IEEE Industrial Electronics Society (IEEE Cat. No.03CH37468).

[6]  Johann W. Kolar,et al.  Design and experimental investigation of a three-phase high power density high efficiency unity power factor PWM (VIENNA) rectifier employing a novel integrated power semiconductor module , 1996, Proceedings of Applied Power Electronics Conference. APEC '96.

[7]  Johann W. Kolar,et al.  Status of the techniques of three-phase rectifier systems with low effects on the mains , 1999, 21st International Telecommunications Energy Conference. INTELEC '99 (Cat. No.99CH37007).

[8]  Youhao Xi,et al.  Analysis and design considerations of a load and line independent zero voltage switching full bridge DC/DC converter topology , 2002 .

[9]  R.E.J. Quigley.  More Electric Aircraft , 1993, Proceedings Eighth Annual Applied Power Electronics Conference and Exposition,.

[10]  Alireza Khaligh,et al.  Maximum Efficiency Tracking of an Integrated Two-Staged AC–DC Converter Using Variable DC-Link Voltage , 2018, IEEE Transactions on Industrial Electronics.

[11]  U. Drofenik,et al.  A novel hysteresis current control for three-phase three-level PWM rectifiers , 2005, Twentieth Annual IEEE Applied Power Electronics Conference and Exposition, 2005. APEC 2005..

[12]  Zeyu Zhang,et al.  A High Step-Down Isolated Three-Phase AC-DC Converter , 2018, IEEE Journal of Emerging and Selected Topics in Power Electronics.

[13]  Ping Qian,et al.  Study on Hysteresis Current Control and Its Applications in Power Electronics , 2011 .