&lt;italic&gt;LCL&lt;/italic&gt;-Filter Design for Robust Active Damping in Grid-Connected Converters

Peña-Alzola, Rafael; Liserre, Marco; Blaabjerg, Frede; Ordonez, Martin; Yang, Yongheng

doi:10.1109/tii.2014.2361604

Cited by 236 publications

(133 citation statements)

References 44 publications

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“…According to the KF features, a KF-based observer is optimum in presence of noise [14] and improves the dynamics of the closed-loop system in noisy environments. For this reason, the proposed method is focused on the statespace model defined by (20)- (21) used in a KF algorithm. This model forces the estimated inverter-side currents to get similar dynamics as in the case of a VSI with only one inductor.…”

Section: B Proposed Model Discretization and Kalman Filter Adaptive mentioning

confidence: 99%

Variable Structure Control for Three-Phase LCL-Filtered Inverters Using a Reduced Converter Model

Guzmán

Vicuña

Castilla

et al. 2018

IEEE Trans. Ind. Electron.

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Abstract-This paper presents a new concept in active damping techniques using a reduced model of a LCLfiltered grid connected inverter. The presence of the LCL filter complicates the design of the inverter control scheme, particularly when uncertainties in the system parameters, especially in the grid inductance, are considered. The proposed control algorithm is addressed to overcome such difficulties using a reduced model of the inverter in a state observer. In this proposal, two of the three state variables of the system are obviated from the physical inverter model and only the inverter side current is considered. Therefore, the inverter side current can be estimated emulating the case of an inverter with only one inductor, thus eliminating the resonance problem produced by the LCL filter. Besides, in the case of a distorted grid, the method allows to estimate the voltages at the point of common coupling free of noise and distortion without using any PLL-based synchronization algorithm. This proposal provides the following features to the closed-loop system: 1) robust and simple active damping control under system parameters deviation, 2) robustness against grid voltage unbalance and distortion, and 3) an important reduction in the computational load of the control algorithm which allows to increase the switching frequency. To complete the control scheme, a theoretical stability analysis is developed considering the effect of the observer, the system discretization and the system parameters deviation. Experimental and comparative evaluation results are presented to validate the effectiveness of the proposed control scheme.

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Section: B Proposed Model Discretization and Kalman Filter Adaptive mentioning

confidence: 99%

Variable Structure Control for Three-Phase LCL-Filtered Inverters Using a Reduced Converter Model

Guzmán

Vicuña

Castilla

et al. 2018

IEEE Trans. Ind. Electron.

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“…The LCL filter offers a resonance frequency which can be a source of instability in the closed-loop system. This problem is stated by various researchers in the literature and numerous damping strategies are proposed to solve it [62][63][64][65]. Damping methods can be classified into two groups.…”

Section: Damping Techniques For Grid-connected Vsismentioning

confidence: 99%

“…Though, these approaches change attenuation of the filter, as a result of which losses increases [18,32,34]. The passive damping techniques, presented generally in the literature, results in the addition of a simple resistor in series with the filter capacitor [63]. The major drawback of this technique is a reduction in filter attenuation, increasing power losses and large filter volume [62].…”

Section: Passive Dampingmentioning

confidence: 99%

Digital Control Techniques Based on Voltage Source Inverters in Renewable Energy Applications: A Review

et al. 2018

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Abstract:In the modern era, distributed generation is considered as an alternative source for power generation. Especially, need of the time is to provide the three-phase loads with smooth sinusoidal voltages having fixed frequency and amplitude. A common solution is the integration of power electronics converters in the systems for connecting distributed generation systems to the stand-alone loads. Thus, the presence of suitable control techniques, in the power electronic converters, for robust stability, abrupt response, optimal tracking ability and error eradication are inevitable. A comprehensive review based on design, analysis, validation of the most suitable digital control techniques and the options available for the researchers for improving the power quality is presented in this paper with their pros and cons. Comparisons based on the cost, schemes, performance, modulation techniques and coordinates system are also presented. Finally, the paper describes the performance evaluation of the control schemes on a voltage source inverter (VSI) and proposes the different aspects to be considered for selecting a power electronics inverter topology, reference frames, filters, as well as control strategy.

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“…Este problema pode ser resolvido através de amortecimento passivo, que diminui a eficiência do conversor, [3], [4], ou através de técnicas de controle de corrente com amortecimento ativo [5]- [8].…”

Section: Introductionunclassified

Modelagem Precisa Para Análise E Projeto De Controle Do Elo Cc Do Conversor Fonte De Tensão Trifásico Com Filtro Lcl Conectado À Rede Elétrica

Filho¹,

Barros²,

Villalva³

et al. 2017

Eletrônica de Potência

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Resumo1 -Este artigo apresenta uma proposta de modelagem matemática da entrada CC do conversor fonte de tensão trifásico (CFT) com filtro LCL, conectado à rede elétrica. Considera-se na modelagem a dinâmica do LCL e do controle de corrente injetada na rede elétrica. Para o controle de corrente, utilizou-se o controlador proporcional ressonante (P-ressonante) com compensação de harmônicas e o amortecimento do LCL é realizado através do filtro notch. Com a modelagem proposta, obtém-se um modelo não linear, que é linearizado para obter um modelo que representa com precisão a dinâmica do lado CC do CFT, em torno do ponto de operação em análise, considerando o modo de operação do CFT (retificador ou inversor). Resultados experimentais comparados com os de simulação são apresentados, comprovando a validade do estudo proposto. Palavras-chave - ACCURATE MODELING FOR ANALYSIS AND CONTROL DESIGN OF THE DC-SIDE OF THE GRID-TIE VSC WITH LCL FILTERAbstract -This paper presents a mathematical modeling of the DC input of the grid-tie three-phase voltage source converter (VSC) with LCL filter. It is considered in modeling the dynamics of LCL filter and the current control injected into the grid. For the converter current control, the resonant proportional controller is used with harmonics compensation and the damping of LCL filter is realized through the notch filter. With the proposed modeling, one obtains a non-linear model which is linearized to obtain a model that represents the dynamics of the DC side of VSC, around the analyzed operating point considering the operation mode of the VSC (rectifier or inverter). Experimental results compared with simulation are presented, proving the validity of the proposed study. O controle do CFT com LCL é estruturado em duas malhas: uma interna para controlar corrente ou potência injetadas na rede elétrica e uma externa para controlar a tensão do elo de corrente contínua (elo CC). A malha de externa gera a referência de corrente ou de potência para a malha interna de controle do CFT [9]- [11]. KeywordsNa modelagem matemática do elo CC para projeto de controle, é comum desprezar a dinâmica de variação de energia do filtro do lado CA do CFT. Entretanto, esta aproximação pode resultar num modelo simplificado que não representa características importantes do CFT, como o comportamento de fase não mínima, quando o mesmo opera como retificador controlado [12]-[17]. Portanto, análises de estabilidade e desempenho de controle, utilizando tais modelos, podem conduzir a resultados que não condizem com a realidade adequadamente [12].Neste artigo, apresenta-se uma modelagem matemática do elo CC considerando a influência da dinâmica do filtro LCL do lado CA do CFT [9]. O modelo não linear deduzido é linearizado, obtendo-se um modelo, que representa com mais precisão o sistema em torno do ponto de operação em análise do que o modelo simplificado. Desta forma, obtêm-se resultados de análises de estabilidade e de desempenho mais condizentes com resultados experimentais. Do lado CA do CFT, adotou-se um s...

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<italic>LCL</italic>-Filter Design for Robust Active Damping in Grid-Connected Converters

Cited by 236 publications

References 44 publications

Variable Structure Control for Three-Phase LCL-Filtered Inverters Using a Reduced Converter Model

Variable Structure Control for Three-Phase LCL-Filtered Inverters Using a Reduced Converter Model

Digital Control Techniques Based on Voltage Source Inverters in Renewable Energy Applications: A Review

Modelagem Precisa Para Análise E Projeto De Controle Do Elo Cc Do Conversor Fonte De Tensão Trifásico Com Filtro Lcl Conectado À Rede Elétrica

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