RIBEIRO, R. L. A.; http://lattes.cnpq.br/6628177274865696; RIBEIRO, Ricardo Lúcio de Araujo.
Resumo:
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.