Stability analysis of a three-phase grid-connected DC power supply with small DC-link capacitor and voltage feed-forward compensation

The purpose of this work was to investigate effect of the DC-link voltage feed-forward compensation on the stability of the three-phase-grid connected DC power supply, used for electrolysis application, equipped with small DC link capacitor. In case of weak grid condition, the system with traditional DC-link voltage feed-forward compensation can go to instability. In this paper, the stability of the system, when the ideal DC-link fluctuation caused by the rectifier is feed-forwarded, is analyzed by using simulation and experiments.