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Previous issue date: 2014-11-24 / Os esquemas de controle convencionais aplicados em Filtros Ativos de Pot?ncia
Paralelos (FAPPs) utilizam extra??o de ham?nicos, de modo que o desempenho da
compensa??o depende da velocidade e precis?o com que os componentes harm?nicos da
carga n?o linear s?o identificados. O FAPP pode ser implementado sem o uso de extratores
de harm?nicos. Neste caso, a compensa??o dos componentes harm?nicos ? obtida
a partir do balan?o de pot?ncia do sistema. O desempenho da compensa??o no caso em
que o balan?o de pot?ncia ? utilizado depende da velocidade com que o sistema entra em
estado de equil?brio. Neste caso, as correntes de fase s?o indiretamente reguladas por um
controlador de dupla sequ?ncia (Double sequence controller - DSC) com dois graus de
liberdade, cujo o princ?pio do modelo interno (internal mode principle - IMP) ? utilizado
para evitar transforma??es de coordenadas e garantir erro nulo em regime permanente.
Adicionalmente o DSC apresenta robustez quando o FAPP opera sob condi??es de desbalanceamento.
Al?m disso, o FAPP implementado sem esquemas de detec??o compensam
simultaneamente harm?ncos e reativos da carga. Suas capacidades de compensa??o, entretanto,
s?o limitadas pela pot?ncia dispon?vel no conversor do FAPP. Tal restri??o pode
ser minimizada se o n?vel de pot?ncia reativa compensada for flexibilizado. Um esquema
de estima??o que determina as correntes do filtro ? introduzido para conferir flexibilidade
na compensa??o de reativos da carga. Resultados experimentais s?o apresentados para
demonstrar o desempenho do sistema proposto. / The conventional control schemes applied to Shunt Active Power Filters
(SAPF) are Harmonic extractor-based strategies (HEBSs) because their effectiveness depends
on how quickly and accurately the harmonic components of the nonlinear loads
are identified. The SAPF can be also implemented without the use of the load harmonic
extractors. In this case, the harmonic compensating term is obtained from the system active
power balance. These systems can be considered as balanced-energy-based schemes
(BEBSs) and their performance depends on how fast the system reaches the equilibrium
state. In this case, the phase currents of the power grid are indirectly regulated by double
sequence controllers with two degrees of freedom, where the internal model principle is
employed to avoid reference frame transformation. Additionally the DSC controller presents
robustness when the SAPF is operating under unbalanced conditions. Furthermore,
SAPF implemented without harmonic detection schemes compensate simultaneously harmonic
distortion and reactive power of the load. Their compensation capabilities, however,
are limited by the SAPF power converter rating. Such a restriction can be minimized
if the level of the reactive power correction is managed. In this work an estimation scheme
for determining the filter currents is introduced to manage the compensation of reactive
power. Experimental results are shown for demonstrating the performance of the proposed
SAPF system.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/19760 |
| Date | 24 November 2014 |
| Creators | Sousa, Raphaell Maciel de |
| Contributors | 31804683434, http://lattes.cnpq.br/6628177274865696, Lima, Antonio Marcus Nogueira, 29158761420, http://lattes.cnpq.br/2237395961717699, Costa, Fl?vio Bezerra, 03168934470, http://lattes.cnpq.br/7510091283933216, Cavalcanti, Marcelo Cabral, 85562300400, http://lattes.cnpq.br/4941009238623926, Roda, Valentin Obac, 59464305800, http://lattes.cnpq.br/4823406157799513, Ribeiro, Ricardo L?cio de Ara?jo |
| Publisher | Universidade Federal do Rio Grande do Norte, PROGRAMA DE P?S-GRADUA??O EM ENGENHARIA EL?TRICA E DE COMPUTA??O, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/doctoralThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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