A Laboratory Investigation of a Multi-Function PR-Controlled DVR

Power quality is important in electrical power networks because sags, swells, harmonic distortion, and other interruptions can cause disturbances to electrical equipment and machines. To maintain power system efficiency, these disturbances must be identified and corrected immediately. The Dynamic Voltage Restorer (DVR) is one of the most efficient power distribution system solutions for these phenomena. Harmonics can be managed using separate controllers for each harmonic frequency using a resonant controller, which is more complicated but better for sinusoidal signals than using a PI controller for multi-frequency control. This study designs and models a new structure and control approach for multifunctional DVRs to correct voltage quality and filter out or inject targeted frequencies. In the stationary frame, the suggested control system uses Proportional Resonant (PR) controllers and Sequence-Decouple Resonant (SDR) controllers. The device and method are tested under voltage swell and voltage distortion. Simulation results show that the suggested DVR improves power quality under various operating scenarios, proving the novel approach works. The DVR controller detects voltage fluctuations and controls the converter to inject phase-specific voltages to compensate load voltage through three single-phase transformers.