Wide Damping Region for &lt;italic&gt;LCL&lt;/italic&gt;-Type Grid-Connected Inverter With an Improved Capacitor-Current-Feedback Method

Li, Xiaoqiang; Wu, Xiaojie; Geng, Yiwen; Yuan, Xibo; Xia, Chenyang; Zhang, Xue

doi:10.1109/tpel.2014.2364897

Cited by 193 publications

(146 citation statements)

References 28 publications

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“…For instance, with one-sample delay (i.e., T d = T s ), the resonance still exists if a is between 1/6 and 1/2, as also analyzed in [26][27][28][29][30][31][32]34]. If (10) is fulfilled, the feedback AD in Fig.…”

Section: Digital Control Delay Impactmentioning

confidence: 81%

“…AD strategies based on feedback compensation are in essence the same while their differences mainly lie in the choice of states for feedback. Typical applications of proportional i C1 feedback can be found in [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34]. For 1 storder derivative feedback of u C1 , a high-pass filter (HPF) with a similar response is an alternative solution [35].…”

Section: Ad Subject To Different Options Of Single Statementioning

confidence: 99%

“…Besides delay, in practical application the filter parameters may vary from their design values and the grid at the PCC has non-negligible impedance. The studies in [6,[27][28][29][30][31][32], and [64][65][66][67][68] showed that the resonance frequency is significantly reduced when the filter parameters and the grid impedance are varied.…”

Section: Stability and Robustness Improvementmentioning

confidence: 99%

“…For i C1 feedback AD (a typical single-state feedback AD), the theoretical derivations in [27][28][29][30][31][32] discussed the detailed design principle to maintain stability and showed that dualloop current control could be stable even when the innerloop AD was unstable (i.e., a fulfills (10)). However, a sharp decrease of x res , challenged this robustness.…”

Section: Single-state Feedback Admentioning

confidence: 99%

“…Filter-based AD improves stability by adding a digital filter next to the current controller [11][12][13][14][15][16]. For feedbackbased AD, the state used for feedback can be the capacitor current [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32], the capacitor voltage [33][34][35][36], the inverterside current [37], the grid current [38][39][40][41] or a combination of multiple states [42][43][44][45][46][47][48][49][50]. Among the feedback-based AD methods, proportional feedback of capacitor current is widely studied during last decade due to its simple implementation.…”

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: 81%

Section: Ad Subject To Different Options Of Single Statementioning

confidence: 99%

Section: Stability and Robustness Improvementmentioning

confidence: 99%

Section: Single-state Feedback Admentioning

confidence: 99%

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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Introduction

2022

Control and Filter Design of Single‐Phase Grid‐Connected Converters

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LCL‐filter resonance suppression in grid‐connected inverter based on strictly real positive plant strategy

Khan

Waseem

et al. 2022

Circuit Theory & Apps

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Resonance is one of the most significant challenges in a voltage source inverter interfaced with the grid through an LCL filter. The capacitor current (CC) damping control methodology is considered due to its high‐quality of grid injected current feature. It is widely accepted that the proportional CC feedback compensation damping method becomes ineffective at critical resonance frequency due to control loop delays and may result in an unstable system under grid impedance or filter parameters variations. A suitable differential compensator placed in the CC feedback path can address this issue with a trade‐off between robustness and noise rejection capability. This paper offers a different design method called parallel feedforward compensation (PFC) method, which builds an almost strictly real positive (ASRP) plant and realized damping with enhanced stability features. In the proposed alternative, a compensator consisting of a damping gain and a sampled delay is placed across the filter plant and filter CC feedback loop and the joint output of this augmented plant is then transmitted back at the reference point on the input side of the inverter to attenuate the undesirable resonance peak. The control response and stability performance analysis show that the suggested methodology offers a wide damping region, high robustness, and improved control performance. Simulation and experimental results are presented to confirm the theoretical findings.

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Wide Damping Region for <italic>LCL</italic>-Type Grid-Connected Inverter With an Improved Capacitor-Current-Feedback Method

Cited by 193 publications

References 28 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

Introduction

LCL‐filter resonance suppression in grid‐connected inverter based on strictly real positive plant strategy

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