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This study addresses the challenges associated with integrating photovoltaic (PV) systems into the Western Algerian power grid, primarily focusing on mitigating frequency fluctuations induced by variable electrical load profiles. These fluctuations can have adverse effects on power quality and grid stability. To address this challenge, the study introduces the benefits of frequency stability analysis and Optimal Power Flow (OPF) control within distributed and adaptable power networks. The primary goal is to enhance the integration of PV systems by ensuring the dynamic stability of the network, optimizing solar energy utilization through the Maximum Power Point Tracking (MPPT) technique, and employing var compensation methods. These strategies are designed to facilitate reliable and economically viable PV integration into the power grid, particularly in the SAIDA-NAAMA region. Through the implementation of OPF control, var compensation techniques, and PV integration, this research achieves a notable reduction in power losses, ranging from 10% to 25% within a single day. Furthermore, the utilization of reactive power control, employing NAAMA's Static Var Compensator (SVC) for the transmission network, along with localized compensatory measures for the distribution network, effectively maintains voltage levels within acceptable parameters. These combined efforts provide critical support for the advancement of PV integration, the transition towards Variable Renewable Energy (VRE) sources, and the promotion of sustainable power generation practices within the region.