三相双降压逆变器中电感的磁集成方式比较与优化设计

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摘要三相双降压逆变器克服了传统桥式逆变器中桥臂功率管直通的问题,可靠性高,但输出滤波电感数量多、体积大,利用磁集成的技术可以减小磁性元件的体积重量,提高系统功率密度。针对该问题从电感耦合方式的角度入手分析不同磁集成方案,从电路原理上讨论各方案的可行性及电感对进网电流波形和电路运行特性的影响。据此提出一种同名端相连不完全耦合的电感集成方案,其等效的三电感形式和传统双降压拓扑中两电感在电路中工作特性一致。和已有的磁集成方案及不采用任何磁集成方案相比,该方案在电感体积和滤波效果等方面均得到优化。最后设计并搭建一台15 kV·A的三相双降压并网逆变器原理样机进行实验验证,实验结果与理论分析吻合。

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	吕林娜
	肖岚
	祁琦

关键词 ：磁集成, 双降压, 三相逆变器, 耦合电感

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.

Key words： Magnetic integration dual-buck three-phase inverter coupled inductor

收稿日期: 2015-04-06 出版日期: 2016-07-15

PACS:

TM464

基金资助:国家自然科学基金(51377082)、江苏省“青蓝工程”和江苏省高校优秀科技创新团队资助项目。

作者简介: 吕林娜女,1994年生,博士研究生,研究方向为电力电子变换技术。E-mail:linna0309@126.com(通信作者);肖岚女,1971年生,教授,博士生导师,研究方向为航空电源系统,功率变换技术等。E-mail:xiaolan@nuaa.edu.cn

引用本文:

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.

链接本文:

https://dgjsxb.ces-transaction.com/CN/Y2016/V31/I13/55

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