Sistemas estáticos com estratégias de controle tolerante a faltas.

Abstract

Static systems with fault-tolerant control strategies.

In this work, static conversion systems with tolerance properties are studied to absences. These properties are obtained from the introduction of detection, identification, reconfiguration and compensation of faults occurred in power. The types of faults, liable to compensation, correspond to loss of command or short circuit in one, two or three converter keys, simultaneously. The detection and identification of the faults and carried out from the comparison between the voltage measurements, in key points of the converter, in front of their respective references. This comparison generates errors which are analyzed according to the converter model in the fault condition. The reconfiguration of the static system, after the occurrence of a fault, and obtained by isolating the components defective and redefining the converter structure. This redefinition can be achieved by reduction of the converter components or the use of redundant devices for replacement of defective referrals. This procedure is performed with the help of keys auxiliary power and fast semiconductor fuses. Two converter structures were used in this work: conventional inverters and AC / AC converters. The control of these converters is implemented by width modulation schemes PWM pulses with vector and scalar approaches. The compensation of the fault condition, and implemented by control strategies, which have adaptation mechanisms for the normal and post-fault operating conditions. Fault tolerance strategies, introduced in this work, they were tested in different static systems, such as: activation of harmonic and reactive machines and compensators. The proposed solutions have been validated by simulation studies and experimental tests.