Multiplicação sincronizada da frequência de geradores elétricos acionados por fontes primárias com fluxos de baixa velocidade

Abstract

This dissertation proposes a way to increase the frequency of electric machines driven by alternative sources with low speed of the driving fluid, such as wind and water. This work presents a technique for multiplying voltage frequency in electrical loads in a stable and safe way using two mechanically synchronized electrical generators. To prove this technique, this dissertation proposes the use of two electrical machines mechanically connected in phase opposition and driven by a single axis in such a way that their frequencies can be added synchronously. The primary driving machine can be of any type [BLDC (Brushless DC), synchronous or induction squirrel cage or coiled]. The secondary machine to be driven must necessarily have both, rotor and stator, wound. The windings of the primary and secondary machines must be connected in a counter phase mode. The resulting frequency may then be more compatible with that of the public network or as close as possible. This technique can reduce the gear ratio of mechanical gearboxes or avoid the need for very high switching frequencies of electronic power converters. This new alternative, in addition to reducing the proportion of speed multipliers, may even completely eliminate them for distributed generation. There have been many laboratory tests with this form of frequency multiplication using resistive, inductive and capacitive loads and connections to the public electricity distribution network. The modeling and simulations of the proposed circuits were performed in the PSIM software to verify the experimental laboratory tests.