Optimisation of LCL filter based on closed‐loop total harmonic distortion calculation model of the grid‐connected inverter

Zheng, Xinxin; Xiao, Lan; Lei, Yun; Wang, Zilong

doi:10.1049/iet-pel.2014.0651

Cited by 40 publications

(25 citation statements)

References 21 publications

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“…Filter-based AD has been broadly discussed in [11][12][13][14][15][16]. 4 Overview of resonance damping strategies with multi-state feedback 4.1 Multi-state feedback control based on zeroplacement…”

Section: Digital Control Delay Impactmentioning

confidence: 99%

“…However, the pulse width modulation (PWM) of the inverter produces many switching harmonics in the grid current. Thus, to limit these current harmonics according to standards such as IEEE Std 929-2000, an L or LCL filter is needed [4][5][6]. Compared with the L filter, the LCL filter with or without a harmonic trap in [5,6] can provide much higher attenuation of switching harmonics with reduced volume and weight so that the power density is increased.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Digital Control Delay Impactmentioning

confidence: 99%

Section: Introductionmentioning

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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“…This design method improves the stability of the converter, however the introduction of filter resistance will have a certain impact on the efficiency. Reference [19] designed the filter parameters according to the relationship between filter parameters and total harmonic distortion (THD) and achieved a better filtering effect. In reference [20], the parameters of the filter were designed by using the restriction of the resonant frequency of the filter.…”

Section: Introductionmentioning

confidence: 99%

“…The design method takes into account the harmonic suppression ability and the stability of the system and has high practicability. However, references [19,20] did not fully consider the relationship between filter parameters and performance indexes. Reference [21] synthetically considered the performance indexes of the filter and drew the relationship curves between the filter parameters and the performance indexes.…”

Section: Introductionmentioning

confidence: 99%

Parameters Design and Optimization of a High Frequency, Interleaved, Dual-Buck, Bidirectional, Grid-Connected Converter

Cui

Wang

2019

Electronics

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In this paper, a high frequency, interleaved, dual-buck, bidirectional, grid-connected converter topology is proposed. Free from the straight-through and dead-time distortion issues, both higher switching frequency and power density can be achieved. Due to the interleaved technique, the current ripple and stress for inductors and other power devices can be effectively reduced. Moreover, a novel filter parameter design method is proposed. The method is optimized with smaller inductance, higher filtering performance, and better steady-state performance. For one thing, the performance requirements under the two states of inverter and rectifier are comprehensively considered. For another, the relationship between the performance indexes and the filter parameters is analyzed. However, the results show that the relationship between the performance indexes is contradictory. A set of optimization parameters were obtained by setting the priority of the filter performance index. The specific design process of the filter parameters is given in detail. In order to verify the rationality of the parameter design, a 5 kW prototype was built and tested. The total harmonic distortions (THDs) of the grid currents in the among grid-connected inverter, off-connected inverter, and rectifier states under full load were 2.7%, 1.2%, and 4.5%, respectively, and the power density reached 36 W/in 3 .

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“…Besides, for the purpose of suppressing switching-frequency harmonics in the grid-connected inverter, an LCL filter is widely used [1]- [3], but the LCL resonance is not beneficial for the current control performance. In last decade, several current control methods capable of LCL resonance damping have been well-established.…”

Section: Introductionmentioning

confidence: 99%

Grid-voltage feedforward based control for grid-connected LCL-filtered inverter with high robustness and low grid current distortion in weak grid

Qian

Xie

et al. 2016

2016 IEEE Applied Power Electronics Conference and Exposition (APEC)

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For grid-connected LCL-filtered inverters, recent applications often observe a weak grid at the point of common coupling (PCC) with non-negligible grid impedance. In this case, the previous control methods would perform poor or even cause the inverter protection. Especially when the feedforward of PCC voltage is designed to suppress grid current harmonics, phase and gain margins will be largely reduced and rejections of grid current harmonics will be aggravated if a weak grid is connected. In fact, the grid voltage feedforward in the weak grid introduces a positive feedback loop related to the grid impedance, and then the unexpected feedback loop makes the inverter dynamic badly influenced by the grid impedance at low frequencies. Therefore, this study proposes to feed forward only the fundamental grid voltage through a second-order generalized integrator (SOGI) and to design the harmonic resonant controller with adaptability to large grid impedance, in order to avoid the undesired dynamic interactions at low frequencies. With the proposed design and control, the grid-connected LCL-filtered inverter is capable of realizing high robustness and low grid current distortion in the weak grid. Comparative experiments verify the effectiveness of the proposed control method.

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Optimisation of LCL filter based on closed‐loop total harmonic distortion calculation model of the grid‐connected inverter

Cited by 40 publications

References 21 publications

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

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

Parameters Design and Optimization of a High Frequency, Interleaved, Dual-Buck, Bidirectional, Grid-Connected Converter

Grid-voltage feedforward based control for grid-connected LCL-filtered inverter with high robustness and low grid current distortion in weak grid

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