Comparison of traditional two-stage buck-boost voltage source inverter and diode-assisted buck-boost voltage source inverter

This paper investigates the wide range voltage modulation, low cost, high efficiency and high power density DC/AC power conversion in renewable energy applications. Three different DC/AC converters: conventional dc-dc boosted voltage source inverter, diode-assisted buck-boost voltage source inverter and diode-assisted buck-boost voltage source inverter with constant dc-link voltage using typical pulse width modulation strategies were compared to discuss their advantages and disadvantages in various practical applications. Voltage stress, current stress and power rating of total switching devices, passive components requirement of each of these system configurations are derived and calculated. Then, design examples of fuel cell power drive system with different system configurations are conducted and compared from aspects of design cost, efficiencies, power density under the same input and output conditions. Calculation and simulation results show that diode-assisted buck-boost voltage source inverter demonstrates advantages in design cost and good performance in power conversion when voltage gain is high (larger than 2.5).

[1]  Wuhua Li,et al.  Review of Nonisolated High-Step-Up DC/DC Converters in Photovoltaic Grid-Connected Applications , 2011, IEEE Transactions on Industrial Electronics.

[2]  S. Bernet,et al.  Power loss-oriented evaluation of high voltage IGBTs and multilevel converters in transformerless traction applications , 2005, IEEE Transactions on Power Electronics.

[3]  Jin Wang,et al.  Constant boost control of the Z-source inverter to minimize current ripple and voltage stress , 2006, IEEE Transactions on Industry Applications.

[4]  Yan Zhang,et al.  Improved pulse -width modulation of diode-assisted buck-boost voltage source inverter , 2010, The 2nd International Symposium on Power Electronics for Distributed Generation Systems.

[5]  F.Z. Peng,et al.  Comparison of Traditional Inverters and $Z$ -Source Inverter for Fuel Cell Vehicles , 2004, IEEE Transactions on Power Electronics.

[6]  A. Agarwal,et al.  Comparisons of SiC MOSFET and Si IGBT Based Motor Drive Systems , 2007, 2007 IEEE Industry Applications Annual Meeting.

[7]  F. Blaabjerg,et al.  An extended model of power losses in hard-switched IGBT-inverters , 1996, IAS '96. Conference Record of the 1996 IEEE Industry Applications Conference Thirty-First IAS Annual Meeting.

[8]  F. Blaabjerg,et al.  Diode-assisted buck-boost voltage source inverters , 2007, 2007 European Conference on Power Electronics and Applications.

[9]  Fang Zheng Peng.  Z-source inverter , 2002 .

[10]  Johann W. Kolar,et al.  Analytical calculation of the RMS current stress on the DC link capacitor of voltage DC link PWM converter systems , 1999, IEMDC 1999.

[11]  Frede Blaabjerg,et al.  Diode-Assisted BuckBoost Voltage-Source Inverters , 2009 .

[12]  Johann W. Kolar,et al.  Analytical calculation of the RMS current stress on the DC-link capacitor of voltage-PWM converter systems , 2006 .