A Capacitor Voltage Balancing Strategy With Minimized AC Circulating Current for the DC-DC Modular Multilevel Converter

被引：87

作者：

Yang, Heng ^{[1
]}

Saeedifard, Maryam ^{[1
]}

机构：

[1] Georgia Inst Technol, Sch Elect & Comp Engn, Atlanta, GA 30332 USA

来源：

IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS | 2017年 / 64卷 / 02期

基金：

美国国家科学基金会;

关键词：

DC-DC power conversion; high-voltage dc (HVDC) converters; modular multilevel converter (MMC); VARIABLE-SPEED DRIVES; OPERATION; SYSTEM;

D O I：

10.1109/TIE.2016.2613059

中图分类号：

TP [自动化技术、计算机技术];

学科分类号：

080201 [机械制造及其自动化];

摘要：

The dc-dc modular multilevel converter (MMC), which has originated from the ac-dc MMC circuit topology, is an attractive converter topology for interconnection of medium-/high-voltage dc grids. Proper operation of the dc-dc MMC necessitates injection of an ac circulating current to maintain its submodule (SM) capacitor voltages balanced. The ac circulating current, however, needs to be minimized for efficiency improvement. In addition, a unique type of imbalance amongst the SM capacitor voltages that is caused by dc power flow needs to be mitigated. This paper proposes a closed-loop control strategy for the dc-dc MMC to simultaneously regulate the dc-link currents, maintain the SM capacitor voltages balanced, and minimize the ac circulating current. Performance and effectiveness of the proposed control strategy are evaluated based on simulation studies in the MATLAB Simulink and experimentally verified on a laboratory prototype.

引用

页码：956 / 965

页数：10

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