Study of a Current Control Strategy Based on Multisampling for High-Power Grid-Connected Inverters With an LCL filter

Zhang, Xing; Chen, Peng; Yu, Cheng‐Chieh; Li, Fēi; Thành, Hiếu Nguyễn; Cao, Renxian

doi:10.1109/tpel.2016.2606461

Cited by 77 publications

(41 citation statements)

References 31 publications

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“…where (15)- (16) have been used. Figure 9 shows the Nyquist plot 3 of GH(jω) for −∞ < ω < ∞. The phase margin is determined from the intersection of the Nyquist plot with the circle of radius 1 centered at (-1,0), and can be computed numerically.…”

Section: Robustness In the Presence Of Time Delaysmentioning

confidence: 99%

“…Several control techniques have been applied to three-phase power converters with an LCL filter. The proposed methods include classical linear techniques such as PI controllers [3], phase compensators [4], resonant controllers [5], linear Lyapunov tools [6] a state-feedback approach [7], linear quadratic regulators [8], and LQG state-feedback controller with resonators [9]. Other examples include Model Predictive Control [10], the use of observers [11], and pseudo-derivative-feedback control method [12].…”

Section: Introductionmentioning

confidence: 99%

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Complex-Based Controller for a Three-Phase Inverter With an <italic>LCL</italic> Filter Connected to Unbalanced Grids

Dòria‐Cerezo

Serra

Bodson

2019

IEEE Trans. Power Electron.

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A new controller for a grid connected inverter with an LCL filter is proposed in this paper. The system is described by its complex representation and the controller is designed using the complex root locus method. The complex representation allows a considerable reduction in the order of the system, simplifying the design task and making it possible to use of advanced techniques such as the complex root locus. The new complex controller adds an extra degree of freedom that makes it possible to move the poles of the systems, and improve stability and speed of response compared to the conventional controls. The paper include a detailed discussion of the effect of the gains of the controller on the root locus. The proposal is validated with simulation and experimental results.

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Section: Robustness In the Presence Of Time Delaysmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Complex-Based Controller for a Three-Phase Inverter With an <italic>LCL</italic> Filter Connected to Unbalanced Grids

Dòria‐Cerezo

Serra

Bodson

2019

IEEE Trans. Power Electron.

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show abstract

“…A modified duty cycle generation method based on area equivalence proposed in [71] can also greatly reduce T d . The multi-sampling method in [72] can reduce the delay to some extent. 3) A digital filter featuring phase advance is also a possible way to compensate phase lag, including the lead filter [29,30], the high-pass filter [31], the second-order generalized integrator (SOGI) [73,74] and so on.…”

Section: Single-state Feedback Admentioning

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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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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“…Therefore, it is not trivial to design the LCL filter at a low switching frequency [30]. The current control bandwidth of the inverter is also limited by the low resonant frequency of the LCL filter [32], [33], which reduces the ability to suppress the influence of the grid background harmonics [5], [6]. In addition, for LCLtype inverter with low switching frequency, the low resonant frequency of the LCL filter can reduce the performance of frequency-selective current control scheme proposed in [34].…”

Section: Introductionmentioning

confidence: 99%

Control Scheme and Performance Analysis of Dual-Frequency Single-Phase Grid-Connected Inverter Interfaced With Weak and Distorted Grids

Yang

Zhang

et al. 2020

IEEE Access

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Grid impedance variation and voltage harmonics may cause instability of the grid-connected inverter system and reduce the grid current quality under weak grid. Switching losses and electromagnetic interference of inverter can be reduced by using lower switching frequency. However, it is a challenging task to achieve stable operation of LCL-type grid-connected inverter using the active damping method at the low switching frequency. In this paper, an improved control strategy is proposed for the dual-frequency inverter, which contains a power inverter and an auxiliary converter. For the proposed control strategy, the ability to suppress the influence of the grid voltage harmonics and the robustness against grid impedance variation are analyzed. In order to reduce the switching losses, the electrical energy is delivered to the power grid through the power inverter at a low switching frequency. By using the switching ripple compensation method and the grid voltage feedforward scheme, the switching current ripple caused by the power inverter and the current harmonics caused by the grid voltage harmonics can be suppressed. Since the filters used in the proposed inverter are all L type filters, the system stability is guaranteed under weak grid. The simulation and experimental results are provided to verify the effectiveness of the proposed gridconnected inverter system under weak grid. INDEX TERMS Dual-frequency inverter, grid-connected inverter, grid impedance, harmonics, stability analysis, weak grid.

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Study of a Current Control Strategy Based on Multisampling for High-Power Grid-Connected Inverters With an LCL filter

Cited by 77 publications

References 31 publications

Complex-Based Controller for a Three-Phase Inverter With an <italic>LCL</italic> Filter Connected to Unbalanced Grids

Complex-Based Controller for a Three-Phase Inverter With an <italic>LCL</italic> Filter Connected to Unbalanced Grids

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

Control Scheme and Performance Analysis of Dual-Frequency Single-Phase Grid-Connected Inverter Interfaced With Weak and Distorted Grids

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