The thesis is entitled "Harmonic Emission, Propagation, and Aggregation Phenomena in Utility-Scale PV Power Plants: A Field Data-Based Analysis" and focuses on an empirical study of harmonic emission, propagation, and aggregation in large-scale photovoltaic power plants in operation. The study reveals how the plant’s internal architecture, cable filtering effects, and interactions with the grid influence spectral behavior, calling into question the validity of simplified generic models. This work provides benchmark strategic insights to optimize the integration of large-scale renewable energy into modern power systems.