Open AccessResearch of the high supply voltage quality control for solid‐state transformer
Author(s) -
Tu Chunming,
Xiao Fan,
Lan Zheng,
Shuai Zhikang
Publication year - 2018
Publication title -
iet power electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.637
H-Index - 77
eISSN - 1755-4543
pISSN - 1755-4535
DOI - 10.1049/iet-pel.2017.0926
Subject(s) - control theory (sociology) , harmonics , voltage , transformer , microgrid , voltage regulation , switched mode power supply , voltage optimisation , engineering , electronic engineering , computer science , control (management) , electrical engineering , artificial intelligence
The harmonics flow characteristic of microgrid will be changed when solid‐state transformer (SST) replaces solid‐state switch or traditional transformer (TT). The supply voltage quality of SST is related to its control strategy at this time. Therefore, a high supply voltage quality control strategy for SST has been proposed in this study. First, the supply voltage characteristics of SST and TT have been compared, and finding that the voltage quality is easy to worsen when SST working without power quality control strategy. Then, the voltage quality regulating mechanism of SST has been analysed. In addition, a novel control strategy which includes the direct voltage control loop and the virtual impedance loop has been proposed for SST. The characteristics of the voltage loop and virtual impedance loop are analysed. The computational burden, harmonic extraction and phase‐locked‐loop are considered in the voltage control loop. The compensational state can vary with the surplus compensation capacity by adopting the virtual impedance loop. Finally, the experimental results verified the validity and effectiveness of the presented control strategy.