Wind energy is a pivotal component in achieving national objectives for carbon neutrality. The evolution of wind energy technology, particularly its transition from terrestrial to maritime settings, underscores a shift where reliability emerges as a paramount challenge for offshore wind power generators. The application of self-circulating boiling heat exchange technology in the cooling of generator stators substantially augments the cooling capacity and reliability of these units. This study delineates the operational characteristics of parallel self-circulating boiling heat exchange systems employed in large-scale offshore wind power generators. Utilizing a one-dimensional homogeneous flow model, this research constructs dynamic resistance balance equations for the system and derives characteristic curves depicting the relationship between system flow and heat load under varying diameters of collector pipes. Empirical investigations were undertaken to corroborate the theoretical models across different collector pipe diameters. Findings reveal that an increase in collector pipe diameter diminishes the system’s operational resistance, thereby enhancing cooling efficiency and system stability. Nonetheless, further increments in the pipe diameter yield diminishing returns in terms of cooling performance enhancement.