Abstract：In response to the issues of large volume，high cost，and complex control algorithms associated with

voltage regulation equipment in new energy distributed power distribution areas，a two-stage voltage regulation

circuit topology based on a DC-link capacitor-free structure was proposed. Based on this topology，a mathematical

model was established in the three-phase rotating coordinate system，and the transfer function was derived，

simplified the model by considering only amplitude control. By combining the advantages of feedforward control

and closed-loop control，a control strategy based on grid voltage feedforward and load voltage feedback was

proposed. A small-signal model of the system was established，and the impact of grid voltage amplitude

disturbances on load voltage amplitude was analyzed using Bode plots. System stability was analyzed using root

locus analysis，and the range of controller parameter values was determined. Simulation comparisons have verified

the practicality of the proposed topology and the precision and speed of the control method.

      Key words：voltage regulator；low-capacity DC capacitor；feedforward control；small-signal analysis