Energy Storage Requirement and Low Capacitance Operation of Unidirectional Current H-Bridge Modular Multilevel Converters

被引：16
|
作者：
Yang, Wenbo [1 ]
Song, Qiang [1 ]
Zhao, Biao [1 ]
机构：
[1] Tsinghua Univ, Dept Elect Engn, Beijing 100084, Peoples R China
来源：
IEEE TRANSACTIONS ON POWER ELECTRONICS | 2019年 / 34卷 / 12期
基金：
国家重点研发计划;
关键词：
High-voltage dc (HVdc); modular multilevel converter (MMC); sub-module (SM) capacitance; ALTERNATE ARM CONVERTER; INJECTION;
D O I：
10.1109/TPEL.2019.2910456
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：
Unidirectional current H-bridge modular multilevel converter (UCH-MMC) is a variant of full-bridge MMC and uses fewer semiconductor devices. The operating area and operation mode of UCH-MMC differ from those of conventional half-bridge MMC (HB-MMC) because of the unidirectional current and bipolar voltage of UCH-MMC arms. Thus, analyzing the energy storage requirement (ESR) of UCH-MMC differs from that of HB-MMC. This paper proposes a model for calculating the ESR of UCH-MMC. The ESR of the UCH-MMC under the entire operating area is analyzed. A modified operating scheme that dynamically trims the sub-module capacitor voltage to allow the low capacitance operation under the entire operating area is proposed. Results verify that the UCH-MMC has much lower ESR than HB-MMC. Evaluation results also show that the cost and volume of the UCH-MMC are much lower than those of HB-MMC because of the low ESR. The low ESR of UCH-MMC was verified by simulations and experiments.
引用
收藏
页码：11748 / 11759
页数：12
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