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Previous issue date: 2011-11-04 / Conventional control strategies used in shunt active power filters (SAPF) employs
real-time instantaneous harmonic detection schemes which is usually implements with
digital filters. This increase the number of current sensors on the filter structure which results
in high costs. Furthermore, these detection schemes introduce time delays which can
deteriorate the harmonic compensation performance. Differently from the conventional
control schemes, this paper proposes a non-standard control strategy which indirectly
regulates the phase currents of the power mains. The reference currents of system are
generated by the dc-link voltage controller and is based on the active power balance of
SAPF system. The reference currents are aligned to the phase angle of the power mains
voltage vector which is obtained by using a dq phase locked loop (PLL) system. The
current control strategy is implemented by an adaptive pole placement control strategy
integrated to a variable structure control scheme (VS-APPC). In the VS-APPC, the internal
model principle (IMP) of reference currents is used for achieving the zero steady
state tracking error of the power system currents. This forces the phase current of the
system mains to be sinusoidal with low harmonics content. Moreover, the current controllers
are implemented on the stationary reference frame to avoid transformations to the
mains voltage vector reference coordinates. This proposed current control strategy enhance
the performance of SAPF with fast transient response and robustness to parametric
uncertainties. Experimental results are showing for determining the effectiveness of
SAPF proposed control system / As estrat?gias de controle convencionais de filtros ativos de pot?ncia paralelos (SAPF
- Shunt Active Power Filters) empregam esquemas de detec??o de harm?nicos em tempo
real, usualmente implementados com filtros digitais. Isso pode resultar em altos custos
devido o aumento no n?mero de sensores na estrutura do filtro. Al?m disso, esses
esquemas de detec??o introduzem atrasos que podem deteriorar o desempenho da compensa??o
de harm?nicos. Diferentemente dos esquemas de controle convencionais, este
trabalho prop?e uma nova estrat?gia de controle que regula indiretamente as correntes de
fase da rede el?trica. As correntes de refer?ncia do sistema s?o geradas pelo controle de
tens?o do barramento CC e s?o baseadas no balan?o de pot?ncia ativa do sistema SAPF.
As correntes de refer?ncia s?o alinhadas com o ?ngulo de fase do vetor tens?o da rede, que
? obtido usando um PLL (Phase Locked Loop). O controle de corrente ? implementado
por uma estrat?gia de controle adaptativo por aloca??o de p?los, integrada com um esquema
de controle com estrutura vari?vel (VS-APPC: Variable Structure - Adaptive Pole
Placement Control). No VS-APPC, o princ?pio do modelo interno (IMP - Internal Model
Principle) de refer?ncia ? usado para eliminar o erro em regime permanente das correntes
de fase do sistema. Isso for?a as correntes de fase do sistema a serem senoidais e com
baixo teor de harm?nicos. Al?m disso, os controladores de corrente s?o implementados
no referencial estacion?rio para evitar transforma??es nas coordenadas de refer?ncia do
vetor tens?o da rede. Esta estrat?gia de controle de corrente melhora a performance do
SAPF com uma resposta transit?ria r?pida e robusto a incertezas param?tricas. Resultados
experimentais s?o apresentados para demonstrar a efic?cia do sistema de controle
proposto para o SAPF
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/15160 |
| Date | 04 November 2011 |
| Creators | Azevedo, Christian Cesar de |
| Contributors | CPF:31804683434, http://lattes.cnpq.br/6628177274865696, Salazar, Andr?s Ortiz, CPF:51618362968, http://lattes.cnpq.br/7865065553087432, Jacobina, Cursino Brand?o, CPF:20523408404, http://lattes.cnpq.br/0261885352003041, 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, UFRN, BR, Automa??o e Sistemas; Engenharia de Computa??o; Telecomunica??es |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/doctoralThesis |
| Format | application/pdf |
| 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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