High-Frequency-Link Current Stress Optimization of Cascaded H-Bridge-Based Solid-State Transformer With Third-Order Harmonic Voltage Injection

被引：25

作者：

Hu, Yujie ^{[1
,2
]}

Li, Zixin ^{[1
,2
]}

Zhang, Hang ^{[1
,2
]}

Zhao, Cong ^{[1
,2
]}

Gao, Fanqiang ^{[1
,2
]}

Luo, Long ^{[1
,2
]}

Luan, Kedong ^{[1
,2
]}

Wang, Ping ^{[1
,2
]}

Li, Yaohua ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, Inst Elect Engn, Key Lab Power Elect & Elect Drive, Beijing 100190, Peoples R China

[2] Univ Chinese Acad Sci, Beijing 10049, Peoples R China

来源：

IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS | 2021年 / 9卷 / 01期

关键词：

Capacitors; Harmonic analysis; Fluctuations; Stress; Equivalent circuits; Power transformer insulation; Power system harmonics; Cascaded H-bridges (CHBs)-based solid-state transformers; high-frequency-link (HFL) current envelope characterization; optimization; series-resonant dual active bridge (DAB) converters (SRCs); third-order harmonic voltage injection (THVI);

D O I：

10.1109/JESTPE.2020.2965232

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：

Cascaded H-bridge (CHB) -based solid-state transformer (SST) consists of CHBs and dual active bridge (DAB) converters. Series-resonant DAB converters (SRCs) are widely used for its advantages of soft switching characteristic and simple control. However, the high-frequency-link (HFL) currents of SRCs contain double-line-frequency harmonic fluctuation in three-phase CHB-based SST, resulting in high current stress. In this article, the SRC is substituted with dc terminal dynamic equivalent circuit, and the analytical expression of the HFL current fluctuation is deduced. With consideration of third-order harmonic voltage injection (THVI), the HFL current fluctuation characteristics with this method are analyzed and the optimal amplitude and phase of the injected third-order harmonic voltage are derived, with which the HFL current stress can be minimized. Both the simulation and experiment results indicate that the HFL current stress of SRCs can achieve a reduction of about 20% with the optimized THVI method.

引用

页码：1027 / 1038

页数：12