Robust Active Damping Methods for LCL Filter-Based Grid-Connected Converters

Saïd-Romdhane, Marwa Ben; Naouar, Mohamed Wissem; Slama‐Belkhodja, Ilhem; Monmasson, Éric

doi:10.1109/tpel.2016.2626290

Cited by 143 publications

(61 citation statements)

References 29 publications

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“…In some applications, it is possible to control the inner loop with a simple proportional regulator for the sole purpose of increasing the high-frequency loop gain, while steady-state errors in grid-current control are handled by the outer grid current loop [79]. The outer loop regulator varies from application to application; the literature reports the use of the simple PI control [79], [80], the PR [37], [40], [78], the PR + odd harmonic repetitive control (OHRC) [81] or the quasi-proportional-resonant fuzzy control [82].…”

Section: B Double-loop Control Structuresmentioning

confidence: 99%

Review and Comparison of Grid-Tied Inverter Controllers in Microgrids

Caldognetto¹

2020

Preprint

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<div><div><div><p>Grid-tied inverters are widely used for interfacing renewable energy sources or storage devices to low-voltage electrical power distribution systems. Lately, a number of different control techniques have been proposed to address the emerging requirements of the smart power system scenario, in terms of both functionalities and performance. This paper reviews the techniques proposed for the implementation of current-controlled or voltage-controlled inverters in microgrids. By referring to a voltage source inverter with LCL output filter, the different control architectures are classified as single-, double-, and triple- loop. Then, the functionalities that are needed or recommended in the grid-connected, islanded, and autonomous operating modes of the grid-tied inverter are identified and their implementation in the different control structures is discussed. To validate the analysis and to better illustrate the merits and limitations of the most effective solutions, six control strategies are finally implemented and experimentally compared on a single-phase, grid-connected inverter setup.</p></div></div></div>

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Section: B Double-loop Control Structuresmentioning

confidence: 99%

Review and Comparison of Grid-Tied Inverter Controllers in Microgrids

Caldognetto¹

2020

Preprint

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“…One is to add additional compensation network in the inverter or hardware equipment outside the inverter after the instability phenomenon occurs in the power plant [11][12][13][14][15][16][17][18][19][20][21][22]. Additionally, the other is the optimization design by taking grid impedance into account before the inverter is produced [23][24][25][26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

An Integrated Design Approach for LCL-Type Inverter to Improve Its Adaptation in Weak Grid

Chen¹,

Liu²,

Liu³

et al. 2019

Energies

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To improve the robustness of grid-connected inverter against grid impedance in a weak grid an integrated design method of LCL-filter parameters and controller parameters is proposed. In the method the inherent relation of LCL-filter parameters and controller parameters is taken into consideration to realize their optimized match. A parameter normalization scheme is also developed to facilitate the system stability and robustness analysis. Based on the method all normalization parameters can be designed succinctly according to the required stability and robustness. Additionally, the LCL parameter and controller parameter can be achieved immediately by restoring normalization parameters. The proposed design method can guarantee the inverter stability and robustness simultaneously without needing any compensation network, additional hardware, or the complicated iterative computations which cannot be avoided for the conventional inverter design method. Simulation and experiment results have validated the superiority of the proposed inverter design method.

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“…Thus, more considerations should be paid to wide variation of the ratio between the sampling frequency and the filter resonant frequency [14]. In prior arts, the issue regarding unknown grid impedance was further alleviated by using some improved damping methods, such as robust or hybrid damping schemes [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Low-Loss Active Grid Impedance Cancellation in Grid-Connected Inverters with LCL Filter

Peng

Hang

2019

Applied Sciences

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Distributed power inverters with inductive capacitive–inductive (LCL) filters have become popular in distributed power generation system. However, due to unknown grid impedance, the inverters are confronted with challenges of local filter resonance, poor power quality, and multiple interactive resonance. This paper proposes a low-loss active compensator that can counteract effects of the grid impedance on the current control performance of single-phase grid-connected inverter with an LCL filter. The compensator utilizes dual unit point-of-common-coupling voltage feedforward control mechanisms (VFFC), in which one is integrated with the inverter controller, and the other is generated through an extra low voltage source converter (LV-VSC) in series with the filter capacitor. The LV-VSC has no additional passive inductive-capacitive filtering elements and provides very low volt-ampere. To confirm its validity, a single-phase inverter testbed integrated with the compensator was built. The experimental results validate the current-controlled performance enhancement of the proposed inverter system operating under different grid conditions.

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Robust Active Damping Methods for LCL Filter-Based Grid-Connected Converters

Cited by 143 publications

References 29 publications

Review and Comparison of Grid-Tied Inverter Controllers in Microgrids

Review and Comparison of Grid-Tied Inverter Controllers in Microgrids

An Integrated Design Approach for LCL-Type Inverter to Improve Its Adaptation in Weak Grid

Low-Loss Active Grid Impedance Cancellation in Grid-Connected Inverters with LCL Filter

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