Abstract：The three-phase dual-buck inverter has higher reliability as it overcomes the straight-leg problem existing in the traditional bridge inverter.However,many output filtering inductors are needed in the topology,which causes bulk capacity.Magnetic integration is a good way to reduce the volume and weight of the magnetic components and improve the power density of the system.In this paper,analysis of different integration methods is carried out considering inductor coupling.The circuit principles are utilized to discuss the possibilities of various methods and the effects of the inductors to the current fed to the grid.Based on the discussion,an optimized method is proposed to integrate the inductors in an incomplete-coupling way with connected dotted terminals,whose equivalent three inductors has identical characteristics with those of the two inductors in the traditional dual-buck topology.This method is better in aspects of the volume and filtering effects in comparison with the existed integration methods and discrete inductors.Finally the theory is validated by a 15kV·A three-phase dual-buck grid-connected inverter prototype.The experiment results are in consistent with the analysis.
吕林娜,肖岚,祁琦. 三相双降压逆变器中电感的磁集成方式比较与优化设计[J]. 电工技术学报, 2016, 31(13): 55-63.
Lü Linna, Xiao Lan ,Qi Qi. Comparison and Optimal Design for Magnetic Integration Methods of Inductors in Three-Phase Dual-Buck Inverters. Transactions of China Electrotechnical Society, 2016, 31(13): 55-63.
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2016, Vol. 31 
