Year: 2026
Type: article
Abstract: Accurate and fast grid synchronization is critical for the control of dynamic voltage restorers (DVRs) in 3-phase power systems, especially in presence of diverse grid disturbances. The conventional phase lock loop (PLL) and second-order generalized integrator (SOGI) based PLL often degrades in performance under voltage sags/swells, harmonic distortion or phase shifts etc leading to poor DVR compensation. Therefore, for handling these disturbances, this paper designed notch filter assisted cascaded SOGI (CSOGI-PLL) for three-phase DVR control and its performance has been comprehensively compared with multiple PLL techniques including PLL, SOGI-PLL, CSOGI-PLL, enhanced PLL (EPLL) and SOGI-EPLL. The proposed technique employs a multi-loop structure in which an inner loop is used for extraction of multi-cycle fundamental and an outer loop for frequency and amplitude normalization; both, ensure robust phase and frequency tracking. Simulation is carried out in MATLAB Simulink under voltage sag/swell, harmonic distortion, frequency variations and phase shift. The proposed PLL achieves lowest value of frequency overshoot and harmonics as compared to others. The multi-loop, normalized SOGI architecture provides enhanced harmonic rejection, fast transient response, and amplitude invariance making it highly appropriate for real-time three-phase DVR.
Source: Engineering Research Express
Language: English
Topic: Power Quality and Harmonics
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W7224128716