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Previous issue date: 2011-02-11 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico / 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 / Resumo: As estrat?gias de controle convencionais de filtros ativos de pot?ncia paralelos
(FAPP) empregam esquemas de detec??o de harm?nicos em tempo real, usualmente
implementados com filtros digitais. Isso aumenta o n?mero de sensores na estrutura do
filtro, o que resulta em altos custos. 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 artigo 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 FAPP. 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). No VS?APPC, o princ?pio do modelo interno (IMP)
de refer?ncia ? usado para eliminar o erro em regime permanente das correntes 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 FAPP com uma
resposta transit?ria r?pida e robustez a incertezas param?tricas. Resultados experimentais
s?o mostrados para demonstrar a efic?cia do sistema de controle proposto para o FAPP
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/15332 |
| Date | 11 February 2011 |
| Creators | Sousa, Raphaell Maciel de |
| Contributors | CPF:31804683434, http://lattes.cnpq.br/6628177274865696, Salazar, Andr?s Ortiz, CPF:51618362968, http://lattes.cnpq.br/7865065553087432, Costa, Fabiano Fragoso, CPF:88465195404, http://lattes.cnpq.br/1694092671948217, Aredes, Mauricio, CPF:67577865753, http://lattes.cnpq.br/9551383663863628, 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/masterThesis |
| 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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