Design Method for the LCL Filters of Three-phase Voltage Source PWM Rectifiers

Guo, Xiaojun; You, Xiaojie; Li, Xinran; Hao, Ruixiang; Wang, Dewei

doi:10.6113/jpe.2012.12.4.559

Cited by 15 publications

(12 citation statements)

References 14 publications

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“…However, LCL filters are small and have sufficiently high attenuation ratios in the high frequency band, relative to L filters and LC filters. Therefore, they are commonly used in grid-connected inverters in the previous studies [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Analysis and Design of LCL Filter with Passive Damping Circuits for Three-phase Grid-connected Inverters

Ahn¹,

Oh²,

Sung³

et al. 2017

Journal of Electrical Engineering and Technology

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-The analysis and design process of the LCL filter with passive damping circuits for threephase grid-connected inverter are presented based on the generalized model of LCL filter. Several types of the passive damping circuits in previous studies could be compared and analyzed by using the generalized model considering various design criteria of passive damping circuits. According to the analysis in this paper, a reasonable configuration of passive damping circuits for three-phase gridconnected inverters is proposed. The validity of the proposed design process is verified by informative simulation and experimental results.

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Section: Introductionmentioning

confidence: 99%

Analysis and Design of LCL Filter with Passive Damping Circuits for Three-phase Grid-connected Inverters

Ahn¹,

Oh²,

Sung³

et al. 2017

Journal of Electrical Engineering and Technology

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show abstract

“…The only difference between (8) and (7) is the assignment of b 3 . This means, the real pole in (7) is located at zero while in (8) is located on the negative real axis of the s-plane.…”

Section: A Pole Assignment Controlmentioning

confidence: 99%

“…In particular, strict standards in respect to current quality are issued in various countries, including Total Harmonic Distortion (THD) and individual harmonic distortions. To effectively attenuate current harmonics around the switching frequency, LCL filters are preferred in pulse width modulated (PWM) voltage-source converters [2], [3]. Compared with L filters, LCL-type filters offer better performance.…”

Section: Introductionmentioning

confidence: 99%

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Systematic Current Control Strategy with Pole Assignment for Grid-Connected LCL-Filtered Inverters

Xu¹,

Xie²,

Tang³

2013

Journal of Power Electronics

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For grid-connected LCL-filtered inverters, resonance yields instability and low bandwidth. As a result, careful designs are required. This paper presents a systematic current control structure, where pole assignment consisting of one or more feedbacks is the inner loop, and the outer loop is the direct grid current control. Several other issues are discussed, such as the inner-loop feedback choices, pole-assignment algorithms, robustness and harmonic rejection. Generally, this kind of strategy has three different types according to the inner-loop feedback choices. Among them, a novel pole-assignment algorithm has been proposed, where the inner control maintains four freely-assigned poles which are just two pairs of conjugated poles located at the fundamental and resonance frequencies separately. It has been found that with the different types, the steady-state and dynamic performances are quite different. Finally, simulations and experiments have been provided to verify the control and design of the proposed methods.

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“…However, because of some non-ideal factors like variations of the LCL parameters and grid impedance, an inverter with a single current feedback is difficult to design and tends to perform poorly in the case of wide parameter variations. Using a passive resistor in series with a capacitor is a simple way to improve the inverter performance at the cost of power losses [2]. Alternatively, during the last decade, researchers have tried to use active damping (AD) to improve performance.…”

Section: Introductionmentioning

confidence: 99%

Stability Analysis and Improvement of the Capacitor Current Active Damping of the LCL Filters in Grid-Connected Applications

Xu¹,

Xie²,

Zhang³

2016

Journal of Power Electronics

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For grid-connected LCL-filtered inverters, dual-loop current control with an inner-loop active damping (AD) based on capacitor current feedback is generally used for the sake of current quality. However, existing studies on capacitor current feedback AD with a control delay do not reveal the mathematical relation among the dual-loop stability, capacitor current feedback factor, delay time and LCL parameters. The robustness was not investigated through mathematical derivations. Thus, this paper aims to provide a systematic study of dual-loop current control in a digitally-controlled inverter. At first, the stable region of the inner-loop AD is derived. Then, the dual-loop stability and robustness are analyzed by mathematical derivations when the inner-loop AD is stable and unstable. Robust design principles for the inner-loop AD feedback factor and the outer-loop current controller are derived. Most importantly, ensuring the stability of the inner-loop AD is critical for achieving high robustness against a large grid impedance. Then, several improved approaches are proposed and synthesized. The limitations and benefits of all of the approaches are identified to help engineers apply capacitor current feedback AD in practice.

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Design Method for the LCL Filters of Three-phase Voltage Source PWM Rectifiers

Cited by 15 publications

References 14 publications

Analysis and Design of LCL Filter with Passive Damping Circuits for Three-phase Grid-connected Inverters

Analysis and Design of LCL Filter with Passive Damping Circuits for Three-phase Grid-connected Inverters

Systematic Current Control Strategy with Pole Assignment for Grid-Connected LCL-Filtered Inverters

Stability Analysis and Improvement of the Capacitor Current Active Damping of the LCL Filters in Grid-Connected Applications

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