A Dynamic Voltage Restorer Based on Self-Regulated Tuning Filter-DQ Algorithm for Complex Power Quality Problems Compensation

This study presents a self-regulated tuning filter (SRTF)--based DQ technique for dynamic voltage restorer (DVR). In contrast to the phase-locked loop (PLL), the proposed controller reduces low-order harmonics in load voltage and phase distortions while improving dynamic responsiveness. Due to the proposed control, the DVR operates at a constant frequency, preventing frequency fluctuations. The DQ control theory uses the SRTF to generate the reference voltage to compensate for grid voltage. A computationally straightforward design and strong band-pass filtering characteristics allow SRTF to mitigate the voltage disparity and respond quickly. Damping factors and accurate grid frequency estimates make the SRTF frequency adaptive. Despite the presence of complex power quality problems in the grid, the SRTF can keep its base frequency at 50 Hz and THD below 5%. The MATLAB/Simulink simulation is run to demonstrate the effectiveness of the comprehensive control system that has been proposed. Additionally, there are comparable studies that demonstrate the advantages of the proposed method in contrast to the state-of-the-art. The findings show that the proposed method can quickly detect and repair any complex power quality problems in the grid while also helping to keep the load-side voltage constant.