A generalized control scheme derivation approach for front-end DC-DC converters in two-stage inverters

The instantaneous output power of the two-stage single-phase inverter pulsates at twice the output voltage frequency, resulting in the second harmonic current (SHC) in the input voltage source and the front-end dc-dc converter. To keep the input voltage source and the front-end dc-dc converter free from the negative effects brought by SHC, special considerations shall be taken on the control scheme of the front-end dc-dc converter. In this paper, a generalized control scheme derivation approach, which bases on the small-signal ac equivalent circuit model with virtual series impedance and parallel impedance, is proposed for different types of front-end dc-dc converters applied in different occasions. By adopting different forms of series impedance and parallel impedance, various control schemes for buck-derived, boost-derived and buck-boost-derived front-end dc-dc converters are obtained. Finally, the feasibility of these control schemes is verified by simulation results.

[1]  Xinbo Ruan,et al.  Second harmonic current reduction and dynamic performance improvement in the two-stage inverters: An output impedance perspective , 2014, 2014 IEEE Energy Conversion Congress and Exposition (ECCE).

[2]  Xinbo Ruan,et al.  A Bandpass Filter Incorporated Into the Inductor Current Feedback Path for Improving Dynamic Performance of the Front-End DC–DC Converter in Two-Stage Inverter , 2014, IEEE Transactions on Industrial Electronics.

[3]  Jorge L. Duarte,et al.  Line-Interactive UPS Using a Fuel Cell as the Primary Source , 2008, IEEE Transactions on Industrial Electronics.

[4]  Konstantin P. Louganski.  Modeling and Analysis of a Dc Power Distribution System in 21st Century Airlifters , 1999 .

[5]  T. Meynard,et al.  Interactions Between Fuel Cells and Power Converters: Influence of Current Harmonics on a Fuel Cell Stack , 2007, IEEE Transactions on Power Electronics.

[6]  Jih-Sheng Lai,et al.  Low Frequency Current Ripple Reduction Technique With Active Control in a Fuel Cell Power System With Inverter Load , 2007, IEEE Transactions on Power Electronics.

[7]  X. Ruan,et al.  Isolated Buck–Boost DC/DC Converters Suitable for Wide Input-Voltage Range , 2011, IEEE Transactions on Power Electronics.

[8]  Xinbo Ruan,et al.  On the Reduction of Second Harmonic Current and Improvement of Dynamic Response for Two-Stage Single-Phase Inverter , 2015, IEEE Transactions on Power Electronics.

[9]  Jih-Sheng Lai,et al.  Low Frequency Current Ripple Reduction Technique with Active Control in a Fuel Cell Power System with Inverter Load , 2007, 2005 IEEE 36th Power Electronics Specialists Conference.