Sistemas de geração de energia elétrica baseados em gerador de indução a partir de fontes eólicas.

Abstract

This work deals with the utilization of a squirrel-cage three-phase induction machine and static converters in electric energy generation systems with wind energy sources.Two isolated generation systems capable to feed rural communities far from electrical grid are studied. One of these systems is composed by a static converter in parallel connection with three-phase load. The control strategy guarantees a regulated load voltage and the regulated bus voltage is realized by assistance circuit key/resistor. The other isolated generation system is composed by a dc-link static converter in capacitors bank. The control strategies are designated to the induction machine speed control optimizing power extraction from itself and regulated load voltage. In both systems an assistance batteries bank might be connected to the dc-bus to ensure the induction generator start and guarantee load supply while wind power is insu cient. Besides that, in times which wind power extraction is insu cient, a load management, in the way of taking o loads from the system, might be done to prioritize the most important loads.Besides isolated systems, is presented here a distributed generation system which can work in regions with access to the electrical grid. This cogeneration system involves induction generator and a grid connection through a dc-link static converter. This structure is able to supply a local load, depending on the wind power available, as well as send the abundance power to grid. In the other hand, when generated power is insu cient to supply the local load, the grid will supply the power complement. The experimental validation of these systems was done using the Wind Turbine Emulator which produces the same torque/speed performance of a real Wind Turbine.