Control of a voltage-source converter connected to the grid through an LCL-filter-application to active filtering

Lindgren, M.; Svensson, J.

doi:10.1109/pesc.1998.701904

Cited by 147 publications

(65 citation statements)

References 7 publications

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“…a deadbeat controller for current is obtained. However, the deadbeat controller for current is built on very precise nominal parameters of the inverter [16][17][18]. In practice, there are some uncertainties in parameter and load disturbances for the converter.…”

Section: Farc Of Grid-connected Invertermentioning

confidence: 99%

Frequency adaptive repetitive control of grid-connected inverters

Nazir

Zhou

Watson

et al. 2014

2014 International Conference on Control, Decision and Information Technologies (CoDIT)

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Abstract-Grid-connected inverters (GCI) are widely used to feed power from renewable energy distributed generators into smarter grids. Repetitive control (RC) enables such inverters to inject high quality fundamental-frequency sinusoidal currents into the grid. However, digital RC which can get approximately zero tracking error of any periodic signal with known integer period in steady-state, cannot exactly track or reject periodic signal of frequency variations. Thus digital RC would lead to a significant power quality degradation of GCIs when grid frequency varies and causes periodic signal with non-integer periods. In this research paper a frequency adaptive repetitive control scheme (FARC) at a predefined sampling rate is proposed to deal with all types of periodic signal of variable frequency. A fractional delay filter which is based on Lagrange interpolation is used to estimate the fractional period terms in RC. This proposed FARC controller offers the fast, during process modification of fractional delay and fast revise of filter parameters, and then provides GCIs with a simple but very accurate real-time frequency adaptive control solution to the injection of high quality sinusoidal current under grid frequency variations. A case study a three-phase GCI is conducted to testify the validity of the proposed strategy.

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Section: Farc Of Grid-connected Invertermentioning

confidence: 99%

Frequency adaptive repetitive control of grid-connected inverters

Nazir

Zhou

Watson

et al. 2014

2014 International Conference on Control, Decision and Information Technologies (CoDIT)

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“…They are principally different from those of grid-connected reactive compensators. In this design, however, the resonance frequency (f res ), as the nonzero poles of the admittance seen from the ac/dc converter (see (2)), depends on the highest frequency component of the load which is compensated by an active filter. • Minimization of stabilizing resistors: The equivalent impedance of the passive LCL-filter approaches zero at the resonance frequency and it will consequently lower the stability margin of the system down.…”

Section: Design Considerationsmentioning

confidence: 99%

“…To avoid over-current limitation, the designer can use parallel switches. • The transfer function h 22 (s) in (2) suggests that choosing big values for L 2 provides higher attenuation for harmonics of the output current i 2 in comparison with the input current i 1 . Thus, the relationship L 2 > L 1 (or k > 1) has already been appeared in literatures (e.g.…”

Section: Inductance Ratiomentioning

confidence: 99%

“…However, deciding on the LCL parameters is not discussed there. Further, steady state and dynamic performance of passive L-filters are compared with those of LCL-filters when they interconnect power electronic converters to the power networks [2]. Also, in [3], the design of PI-controller is analyzed for the gridconnected converters, and so are the effects of the parameters of an LCL-filter on the performance of the controller.…”

Section: Introductionmentioning

confidence: 99%

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An efficient procedure to design passive LCL-filters for active power filters

Bina

Pashajavid

2009

Electric Power Systems Research

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“…Dois tipos de filtros passivos são geralmente considerados para a conexão de conversores PWM à rede elétrica: os filtros de terceira ordem LCL e os filtros de primeira ordem L. Filtros LCL possibilitam uma maior atenuação das harmôni-cas de alta frequência quando comparados ao filtro L. Logo, a principal limitação do filtro L é a necessidade do uso de uma alta freqüência de comutação para assegurar a atenuação das harmônicas de corrente. Dessa forma, são usualmente empregados filtros LCL que resultam em um melhor desempenho com um consumo reduzido de reativos (Liserre et al, 2005) (Lindgren e Svensson, 1998).…”

Section: Introductionunclassified

Projeto e implementação de um controlador de corrente robusto para inversores com filtro LCL conectados à rede com incertezas paramétricas

Gabe

Massing

Montagner

et al. 2009

Sba Controle & Automação

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This paper addresses the design and implementation of a discrete controller for grid connected voltage source inverters with LCL-filter usually found in wind power generation systems. First a theorem that relates the controllability of the discrete dynamic equation of the inverter with LCL-filter and the sampling frequency is derived. Then, a condition to obtain a robust partial state feedback controller based on linear matrix inequalities is proposed. This controller guarantees the stability and damping of the LCL-filter resonance for a large set of grid conditions without requiring self-tuning procedures. Finally, an internal model controller is added to ensure asymptotic reference tracking and disturbance rejection, therefore reducing significantly the impact of grid background voltage distortion on the output currents. Simulation and experimental results are presented to support the theoretical analysis and to demonstrate the system performance. RESUMOEste artigo trata do projeto e implementação de um controlador discreto de corrente para um inversor trifásico alimentado em tensão e conectado à rede através de um filtro LCL, geralmente encontrado em sistemas de geração eólica. Primeiramente, é desenvolvido um teorema que relaciona a controlabilidade da equação dinâmica discreta, que representa o comportamento do conversor conectado à rede, aos parâmetros do filtro e a freqüência de amostragem do sistema. Então é derivada uma condição para a obtenção dos ganhos de retroação parcial robusta de estados baseada em desigualdades matriciais lineares. Este controlador garante a estabilidade e o amortecimento ativo da ressonância do filtro LCL conectado à rede, mesmo com incertezas paramétricas no ponto de conexão sem a necessidade de procedimentos de auto-sintonia ou algoritmos adaptativos. Finalmente, um controlador com modelo interno é adicionado a fim de prover rastreamento assimptótico da referência e rejeição do distúrbio, diminuindo significativamente o impacto dos distúrbios harmônicos de baixa freqüência da tensão da rede nas correntes de saída. Resultados experimentais e de simulação são apresentados para dar suporte a análise teórica desenvolvida bem como para demonstrar o desempenho do sistema.

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Control of a voltage-source converter connected to the grid through an LCL-filter-application to active filtering

Cited by 147 publications

References 7 publications

Frequency adaptive repetitive control of grid-connected inverters

Frequency adaptive repetitive control of grid-connected inverters

An efficient procedure to design passive LCL-filters for active power filters

Projeto e implementação de um controlador de corrente robusto para inversores com filtro LCL conectados à rede com incertezas paramétricas

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