The Impact of Voltage-Balancing Control on Switching Frequency of the Modular Multilevel Converter

被引：38
|
作者：
Li, Yalong [1 ,2 ]
Jones, Edward A. [1 ,2 ]
Wang, Fei [1 ,2 ]
机构：
[1] Univ Tennessee, Ctr Ultra Wide Area Resilient Elect Energy Transm, Knoxville, TN 37996 USA
[2] Univ Tennessee, Dept Elect Engn & Comp Sci, Knoxville, TN 37996 USA
来源：
IEEE TRANSACTIONS ON POWER ELECTRONICS | 2016年 / 31卷 / 04期
基金：
美国国家科学基金会;
关键词：
High-voltage direct current (HVDC); modular multilevel converter (MMC); submodule capacitance design; submodule capacitor unbalanced voltage; switching frequency; voltage-balancing control; CELLS;
D O I：
10.1109/TPEL.2015.2448713
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：
Voltage-balancing control in a modular multilevel converter (MMC) impacts not only the voltage difference among submodule capacitors, but also the power device switching patterns. As a result, MMC possesses a nondeterministic switching pattern and its switching frequency is no longer an independent parameter. This paper theoretically investigates how voltage-balancing control influences the switching frequency in the MMC. Equations describing the relationship between the submodule capacitor unbalanced voltage and converter switching frequency are derived. Since unbalanced voltage also impacts the submodule capacitor ripple voltage and voltage/current harmonics, the design interaction between switching frequency and submodule capacitance, as well as the selection of unbalanced voltage are further investigated. Both simulation and experimental verifications are provided.
引用
收藏
页码：2829 / 2839
页数：11
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