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
Rok vydání: 2021
Předmět:
Zdroj: IEEE Journal of Emerging and Selected Topics in Power Electronics. 9:1027-1038
ISSN: 2168-6785
2168-6777
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