Sistemas estáticos de geração elétrica com gerador de indução a partir de fonte eólica.

Abstract

This work deals with static generation systems with three phase induction machine. from wind energy sources. To increase strategy accounting control systems, a fixed pitch wind turbine emulator is developed based on a two mass model of a turbine where the mechanical coupling between the turbine rotor shaft (mainshaft) and the generator shaft is represented by an elastic constant. This emulator consists of a direct current motor with independent quote coupled to an induction generator, and powered by a converter in full bridge. Control of the armature current is performed so that the tor cc can satisfactorily reproduce the torque / speed characteristics of wind turbine. The emulator is applied to the electric generation system with the induction machine. three-phase with cage rotor associated with a PWM converter. Two structures are presented: (a) an isolated generation system with variable three phase load, in which the control strategy guarantees a constant frequency balanced load voltage and the dc bus voltage regulation is performed by an auxiliary circuit. switch / resistor; (b) a distributed generation system with single-phase grid connection, where single-phase to three-phase conversion is performed by a five-arm The control strategy for this system ensures a constant frequency balanced voltage at the load terminals. The control of the power factor of the current of the single phase distribution network allows to obtain sine currents in the system. as well as maximizing the converter input power factor hunting. Capacitor voltage regulation defines the amplitude of the current in the system single phase ensuring that the single phase grid provides power for the three phase load (when available wind energy is insufficient) or receive excess energy from the generator (when available wind power is greater than that required by the load). In the last part of the work a generation system with the machine is presented. rotor induction circuit connected directly to a power grid three-phase with the rotor powered by a six-arm AC converter. Are investigated control strategies by orientation by the statistical field controlling the flow or the reactive power of the stator. From the two control strategies presented are The behavior and characteristics of the system under permanent generation to determine an appropriate operating region. They are also The behaviors and characteristics of reactive power control and dynamically conjugated system for two types of transients.