A Modular Multilevel DC/DC Converter With Fault Blocking Capability for HVDC Interconnects

被引：233

作者：

Kish, Gregory J. ^{[1
]}

Ranjram, Mike ^{[1
]}

Lehn, Peter W. ^{[1
]}

机构：

[1] Univ Toronto, Dept Elect & Comp Engn, Toronto, ON M5S 3G4, Canada

来源：

IEEE TRANSACTIONS ON POWER ELECTRONICS | 2015年 / 30卷 / 01期

基金：

加拿大自然科学与工程研究理事会;

关键词：

Converters; dc-dc power conversion; HVDC converters; multilevel systems; DC-DC CONVERTERS; TRANSFORMERLESS; DESIGN;

D O I：

10.1109/TPEL.2013.2295967

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

080906 [电磁信息功能材料与结构]; 082806 [农业信息与电气工程];

摘要：

This paper introduces amodular multilevel dc/dc converter, termed the DC-MMC, that can be deployed to interconnect HVDC networks of different or similar voltage levels. Its key features include: 1) bidirectional power flow; 2) step-up and step-down operation; and 3) bidirectional fault blocking similar to a dc circuit breaker. The kernel of the DC-MMC is a new class of bidirectional single-stage dc/dc converters utilizing interleaved strings of cascaded submodules. The DC-MMC operation is analyzed and an open loop voltage control strategy that ensures power balance of each submodule capacitor via circulating ac currents is proposed. Simulations performed in PLECS validate the DC-MMC's principle of operation and the proposed control strategy. Experimental results for a 4-kW laboratory prototype illustrate the single-stage dc/dc conversion process for both step-down and step-up operating modes.

引用

页码：148 / 162

页数：15

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