High-Frequency-Link Current Stress Optimization of Cascaded H-Bridge-Based Solid-State Transformer With Third-Order Harmonic Voltage Injection
| Autor: | Hang Zhang, Fanqiang Gao, Long Luo, Zixin Li, Ping Wang, Yaohua Li, Hu Yujie, Kedong Luan, Cong Zhao |
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| Rok vydání: | 2021 |
| Předmět: |
Physics
020208 electrical & electronic engineering 05 social sciences Energy Engineering and Power Technology 02 engineering and technology Converters H bridge Topology law.invention Harmonic analysis Third order Capacitor law 0202 electrical engineering electronic engineering information engineering Harmonic Equivalent circuit 0501 psychology and cognitive sciences Electrical and Electronic Engineering Transformer 050107 human factors |
| Zdroj: | IEEE Journal of Emerging and Selected Topics in Power Electronics. 9:1027-1038 |
| ISSN: | 2168-6785 2168-6777 |
| DOI: | 10.1109/jestpe.2020.2965232 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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