The explosion of advanced electronic units and green sources integration has significantly degraded power quality (PQ), leading to voltage turbulences (sags\ total harmonics distortions (THD)). This study addresses these challenges by using a Dynamic Voltage Restorer (DVR) controlled via a fractional order PID (FOPID) controller, optimized using the Improved Crayfish Optimization Algorithm (ICOA). The proposed system enhances PQ in a hybrid wind-grid system by mitigating voltage imbalances and THD. Simulation outcomes reveal the optimized FOPID of DVR via ICOA framework success : voltage sag compensation improved the load voltage (LV) from 70% to 99.47% of its nominal value, while THD was reduced from 12.09% to 1.84% during sag events and from 8.96% to 1.73% during swell events. Comparative analyses revealed that ICOA outperformed other optimization techniques (PSO, GOA, GTA) with a computational time of 173.554 seconds and an objective function value of 2.371. Additionally, the ICOA-FOPID controller exhibited superior performance over traditional PID controllers, achieving faster response times and lower fitness values. The study also highlights the DVR's advantages over DSTATCOM, showcasing its ability to maintain near-unity voltage (≈1 pu) under fault conditions, compared to DSTATCOM's ≈0.98 pu. These findings validate the suggested solution for PQ enhancement, ensuring compliance with IEEE 519 standards for harmonic limits.
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Thaiban et al. (2025) studied this question.