Abstract
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.
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