ENERGY
Davlatov Azamjon Mahmadievich
Annotation:
The present work investigates the efficiency of multiphase synchronous generators for small and medium-capacity hydropower plants. Generally, these electrical machines operate in an autonomous, unattended mode. The increase in the number of phases is driven by the need for higher reliability; in multiphase machines, a single-phase failure results in performance degradation rather than a total system shutdown, while simultaneously improving the overall efficiency of the generator. This study
evaluates the operational efficiency of generators across an increased number of phases and various connection schemes to the rectifier unit. The number of phases was varied from 3 to 9. Star, ring (polygon), and bridge connection schemes were examined. The average value of the rectified voltage and the ripple factor (ripple level) were used as quality indicators. The analysis results are summarized in tables, which are convenient for use in engineering practice.
Keywords: mini hydropower plant (Mini HPP); generator winding, multiphase generator, rectifier, bridge rectifier
connection, rectified voltage ripple.