无直流电解电容的两级调压电路及其控制方法OA

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.