Power electronics play a significant role in modern power systems, particularly in the context of renewable energy integration, electric vehicle charging, and industrial applications. While offering numerous benefits, such as improved efficiency and dynamic control, power electronics also introduce harmonic distortion into power systems. This article explores the impact of power electronics on power system harmonics, discussing their sources, effects, mitigation techniques, and the broader implications for power quality and grid stability. Key strategies for controlling harmonic distortion, including active filters and improved converter designs, are analyzed. The increasing reliance on power electronics in future grid systems necessitates comprehensive understanding and effective management of harmonics to ensure optimal system performance.