A Transformerless Bipolar Modular Multilevel DC-DC Converter With Wide Voltage Ratios

被引:47
作者
Du, Sixing [1 ]
Wu, Bin [1 ]
机构
[1] Ryerson Univ, Dept Elect & Comp Engn, Toronto, ON M5B 2K3, Canada
关键词
DC-DC converter; dc grids; single-stage power conversion; transformerless multilevel converter; HVDC APPLICATIONS; DC/DC CONVERTER; OPERATION; CAPABILITY; GRIDS;
D O I
10.1109/TPEL.2016.2640662
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
This paper presents a transformerless bipolar dc-dc converter based on series-connected submodules. It is intended for transforming dc voltage and managing power flow for medium/high-voltage dc grids. The dc-dc converter is composed of positive-pole and negative-pole subsystems, each of which consists of six arms/branches. Every two arms and one branch are constructed into a T-type circuit with the outer terminals interface to primary-and secondary-side dc buses. The two T-type circuits in one subsystem are connected in parallel to transmit power between primary and secondary sides. The transformerless structure (none bulky coupled inductors as well) solves the challengeable insulation and cooling issues of the extremely high-power magnetics in prior arts, while not sacrificing the power efficiency and system reliability. A +/- 10-kV 2-MW simulation model performed in MATLAB/Simulink verifies the feasibility of the bipolar dc-dc converter. Experimental results obtained from a laboratory setup also confirm the validation of the proposal.
引用
收藏
页码:8312 / 8321
页数:10
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