Design of
            <i>LCL</i>
            and
            <i>LLCL</i>
            filters for single‐phase grid connected converters

Sanatkar-Chayjani, Majid; Monfared, Mohammad

doi:10.1049/iet-pel.2015.0922

Cited by 57 publications

(21 citation statements)

References 32 publications

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“…While, there are still many other connecting filters in practice, such as LCL filters, or LLCL filters, which show better performance against switching harmonic from the main grid side but have much more complex dynamics than those of L filters and thus are more difficult to control. 24 In the future, it might be interesting to further consider the DDG cluster interfaced by more complex and advanced connecting filters.…”

Section: Discussionmentioning

confidence: 99%

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A unified distributed robust control framework for power sharing of grid‐connected dispatchable distributed generator cluster

Su¹,

Tu²,

Cai

2020

Adv Control Appl

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Summary In this paper, a unified distributed robust control framework is proposed to address the power sharing problem for a cluster of dispatchable distributed generators (DDGs) within a grid‐connected AC microgrid. In contrast to the existing results, the advantages of the proposed control design are threefold. First, the unified design can directly handle the dynamics of the closed‐loop system by Lyapunov analysis without the assumption on time scale separation. Second, the canonical internal model is adopted so that the controller is able to undertake arbitrarily large parametric uncertainties. Last not least, the associated control gains can be obtained once and for all following the standard procedure. Comprehensive numerical simulations are provided for performance validation.

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Section: Discussionmentioning

confidence: 99%

“…According to (21), (24), (28), and (30), the derivative of U(⋅) along the trajectory of the closed-loop system satisfieṡ…”

Section: Stability Analysismentioning

confidence: 99%

A unified distributed robust control framework for power sharing of grid‐connected dispatchable distributed generator cluster

Su¹,

Tu²,

Cai

2020

Adv Control Appl

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“…The LCL filter capacitor is designed so that its consumption of reactive power is less than λ% of the rated power P as shown in Equation (14a) [36][37][38]. In this equation, Q c denotes the reactive power consumed by the filter capacitor and λ is a positive factor chosen generally equal to or lower than 5% [36][37][38].…”

Section: Maximum Lcl Filter Capacitor Valuementioning

confidence: 99%

“…In this equation, Q c denotes the reactive power consumed by the filter capacitor and λ is a positive factor chosen generally equal to or lower than 5% [36][37][38]. According to Equations (14a) and (14b), the maximum value of the filter capacitor can be expressed as in Equation (14c): …”

Section: Maximum Lcl Filter Capacitor Valuementioning

confidence: 99%

An Improved LCL Filter Design in Order to Ensure Stability without Damping and Despite Large Grid Impedance Variations

et al. 2017

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Abstract:With the smart grid revolution, there is a growing interest in the use of power converters associated to LCL filters to interface between the main utility grid and loads or renewable energy sources. LCL filters are commonly used mainly due to their low cost and high filtering performances. To achieve these performances, it is necessary to meticulously pick out the LCL filter parameters, taking into account grid code requirements and grid configuration and/or conditions. Several methodologies for LCL filter design have been presented and discussed in the literature. The main goal of this paper is to propose a simple, robust and systematic design methodology for LCL filter parameter tuning. The considered design methodology is aimed to overcome the shortcomings of classical design methodologies, namely, stable operation under different grid configurations and conditions. Compared to previous works, the proposed design methodology allows the achievement of robust LCL filter design with regard to large grid impedance variations without the use of any damping method. Also, it takes into account accuracy of capacitor standard values and proposes a simple design method for the converter side inductor that avoids saturation problems. An example of LCL filter design is presented and discussed. The obtained filter parameters were firstly tested using a Matlab-Simulink software tool. After that, they were tested through the development of an experimental set-up. The obtained simulation and experimental results show the reliability and efficiency of the proposed design methodology.

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“…In summary, for low x res , it is possible to use i L1 closed-loop control, while it is hard for the i L2 closed-loop control to be stable. For high x res , i L1 closed-loop control is no longer stable, while i L2 closed-loop control works well [11,12,26,[61][62][63].…”

Section: Digital Control Delay Impactmentioning

confidence: 99%

LCL-resonance damping strategies for grid-connected inverters with LCL filters: a comprehensive review

Xie

2017

J. Mod. Power Syst. Clean Energy

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Grid-connected LCL-filtered inverters are commonly used for distributed power generators. The LCL resonance should be treated properly. Recently, many strategies have been used to damp the resonance, but the relationships between different damping strategies have not been thoroughly investigated. Thus, this study analyses the essential mechanisms of LCL-resonance damping and reviews state-of-the-art resonance damping strategies. Existing resonance damping strategies are classified into those with single-state and multi-state feedback. Singlestate feedback strategies damp the LCL resonance using feedback of a voltage or current state at the resonance frequency. Multi-state feedback strategies are summarized as zero-placement and pole-placement strategies, where the zero-placement strategy configures the zeros of a novel state combined by multi-state feedback, while the poleplacement strategy aims to assign the closed-loop poles freely. Based on these mechanisms, an investigation of single-state and multi-state feedback is presented, including detailed comparisons of the existing strategies. Finally, some future research directions that can improve LCL-filtered inverter performance and minimize their implementation costs are summarized.

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Design of LCL and LLCL filters for single‐phase grid connected converters

Cited by 57 publications

References 32 publications

A unified distributed robust control framework for power sharing of grid‐connected dispatchable distributed generator cluster

A unified distributed robust control framework for power sharing of grid‐connected dispatchable distributed generator cluster

An Improved LCL Filter Design in Order to Ensure Stability without Damping and Despite Large Grid Impedance Variations

LCL-resonance damping strategies for grid-connected inverters with LCL filters: a comprehensive review

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