This research paper investigates the influence of photovoltaic (PV) array location on power quality within the context of an IEEE 9-bus system. As the global energy landscape shifts towards distributed generation (DG) renewable energy systems, understanding the dynamic interactions between PV systems and power grids becomes increasingly crucial. The study addresses a notable gap by comprehensively examining the impact of PV array location on total harmonic distortion (THD) under varying penetration levels. Leveraging mathematical modeling techniques and utilizing the IEEE 9-bus system as a benchmark, the research conducts a series of case studies involving load variations and sequential connections of PV systems to different buses. The findings underscore the importance of strategic PV array placement in mitigating harmonic distortion and ensuring power quality in grid-connected systems. Overall, this study contributes insights to the evolving field of renewable energy integration, emphasizing the significance of thoughtful PV system placement for enhancing grid stability and performance.