Résumé: The usage of the word Power quality in recent times acquired intensified interest due to the complex industrial processes. The usage of intelligent tools to improve power quality is increasing day by day, as assumption of present day power system as a linear model is unsatisfactory. This paper deals with analysis of Differential Evolution (DE), Hybrid Differential Evolution (HDE) and Variable Scaling Hybrid Differential Evolution for harmonic reduction in the source current with optimal tuning of PI controller gain values. Shunt Active power Filter is one of the better solution to suppress the source current harmonics which are induced into power system because of nonlinear loads. Current controller called HBCC is considered for gating operation of switches in Voltage Source Inverter. The Intelligent tuned PQ theory is used for reference current generation. The then obtained compensating currents are injected at point of common coupling for current disturbance mitigation. Simulations of MATLAB/SIMULINK environment of the present work shows the efficacy.

Résumé: In light of the pressing concerns regarding global warming and the diminishing availability of fossil fuels, there has been a notable surge in the adoption of distributed generation (DG) systems, which harness clean and renewable energy sources. These systems are strategically placed in close proximity to end-users, thereby reducing power losses. However, without effective control mechanisms, issues such as voltage instability and increased power losses can impede the efficient functioning of the power grid. In this paper, an innovative approach termed Optimal Coordinated Voltage Control (OCVC) is designed for distribution networks integrating dispersed renewable energy sources. Employing a genetic algorithm (GA) methodology and implementing multi-core simulation using the open-source platform OpenDSS, this method aims to optimize the settings of voltage control devices remotely. Moreover, it accounts for dynamic variations in both load and generation patterns through day-ahead scheduling. To evaluate the efficacy of the proposed technique, simulations are conducted on a test distribution network featuring the integration of DG systems. Lastly, the proposed OCVC method can achieve more than a 50% reduction in OLTC and SC switching over a 24-hour schedule compared to non-coordinated techniques. Additionally, the proposed method offers the benefits of minimizing power losses and limiting changes in bus voltages.