Weighted Average Current Control in a Three-Phase Grid Inverter With an LCL Filter

He, Ning; Xu, Dehong; Zhu, Ye; Zhang, Jun; Shen, Ge; Zhang, Yangfan; Ma, Jie; Liu, Changjin

doi:10.1109/tpel.2012.2219322

Cited by 77 publications

(52 citation statements)

References 29 publications

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“…Detailed derivations can be found in [54]. It is found that both weighted average control (WAC) and split capacitor current (LCCL) control in [51][52][53][54][55] are typical applications and use exactly the same weights. In WAC,…”

Section: Choices Of State Feedback For Zero-placementmentioning

confidence: 99%

“…Among the feedback-based AD methods, proportional feedback of capacitor current is widely studied during last decade due to its simple implementation. For weighted average control, using the weighted average of the grid current and the inverter-side current, the LCL resonance is avoided [51][52][53][54][55][56][57]. All these control strategies have Shaojun XIE eeac@nuaa.edu.cn been reported to suppress the LCL resonance.…”

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: Choices Of State Feedback For Zero-placementmentioning

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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“…It is mainly used to help in classifying the indexing terms by assigning them weights corresponding to how well they are in improving both the recall and precision of the retrieval [6]. A number of efforts were carried out to improve the performance of current weighting schemes [7] to which some limitations may be resulted due to the use of probabilistic model to describe a set of possible probability distributions for a set of observed data. It can also be used to determine the distribution in the probabilistic model [8][9].This paper attempts to determine the potential of Noun Phrase (NP) in text similarity.…”

Section: Introductionmentioning

confidence: 99%

Noun phrase based weghting scheme for sentence similarity measurement

Mahmood

Kamaruddin

Naser

2018

J. Fundam and Appl Sci.

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“…It is well-known that the proportional integral (PI) controller has an infinite gain for dc component, thus guarantees a precise tracking for dc references without steady-state error. However, for ac references, the PI controller would lead to steady-state error due to the finite gain at the selected frequency [18], [19]. The proportional resonant (PR) controller can provide infinite gain at the selected resonant frequency to suppress the effect of the unwanted harmonics, thus ensuring zero steady-state error when tracking an ac reference at the selected frequency [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Stationary Frame Current Control Evaluations for Three-Phase Grid-Connected Inverters with PVR-based Active Damped LCL Filters

Han¹,

Shen²,

Guerrero³

2016

Journal of Power Electronics

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Grid-connected inverters (GCIs) with LCL output filter have the ability of attenuating high-frequency (HF) switching ripples. However, by using only grid-current control, the system is prone to resonances if it is not properly damped, and the current distortion would be amplified significantly under highly distorted grid conditions. In this paper, a synchronous reference frame equivalent proportional-integral (SRF-EPI) controller in αβ stationary frame using the parallel virtual resistance-based active damping (PVR -AD) strategy for grid-interfaced distributed generation (DG) systems to suppress the LCL resonance is proposed. Although both proportional-resonant (PR) controller in αβ stationary frame and PI controller in dq synchronous frame achieve zero steady-state error, the amplitude-and phase-frequency characteristics differ greatly from each other except for the reference tracking at fundamental frequency. Therefore, an accurate SRF-EPI controller in αβ stationary frame is established to achieve precise tracking accuracy. Moreover, the robustness, harmonic rejection capabilities, and influence of control delay are investigated by the Nyquist stability criterion when the PVR-based AD method is adopted. Furthermore, the grid voltage feed-forward and multiple PR controllers are integrated in the current loop to mitigate the current distortion introduced by the grid background distortion. Besides, the parameters design guidelines are presented to show the feasibility and effectiveness of the proposed strategy. Finally, simulation and experimental results are provided to validate the feasibility of the proposed control approach.

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Weighted Average Current Control in a Three-Phase Grid Inverter With an LCL Filter

Cited by 77 publications

References 29 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

Noun phrase based weghting scheme for sentence similarity measurement

Stationary Frame Current Control Evaluations for Three-Phase Grid-Connected Inverters with PVR-based Active Damped LCL Filters

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