Passivity-Based Design of Plug-and-Play Current-Controlled Grid-Connected Inverters

Akhavan, Ali; Mohammadi, Hamid Reza; Vasquez, Juan C.; Guerrero, Josep M.

doi:10.1109/tpel.2019.2920843

Cited by 80 publications

(33 citation statements)

References 45 publications

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“…6 represents the computation and ZOH delay, and cannot be ignored, otherwise, there will be mistakes during the derivation process. G d (s) can be expressed by (12) according to the Pade approximant, where Based on Fig. 6, the transfer function G vgig (s) from v g to i g can be derived as (13).…”

Section: Grid Voltage Harmonic Suppressionmentioning

confidence: 99%

“…Recently, the effect of the capacitor voltage feedforward (CVF) on the ICF control has been researched in many papers. It is reported that the third-order LCL filter can be simplified to a first-order L filter when the CVF is used [10], [11], and the CVF can also improve the robustness of LCL active damping against the grid impedance for the ICF control [12]- [15]. However, although the CVF is helpful for the active damping of the LCL filter at the resonant frequency, the voltage feedforward loop is detrimental to the current control in low-frequency range, especially in weak grids [16], [17].…”

Section: Introductionmentioning

confidence: 99%

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A Novel Inverter-Side Current Control Method of $LCL$ -Filtered Inverters Based on High-Pass- Filtered Capacitor Voltage Feedforward

Zhou

2020

IEEE Access

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LCL filters have been widely used as the interface between inverters and power grids, but damping methods must be taken to solve the resonance of LCL filters. Considering overcurrent protection and inherent active damping, this paper focuses on the inverter-side current feedback (ICF) control. Some literatures have proposed that the capacitor voltage feedforward (CVF) is beneficial to the stability of the ICF control. However, in practical applications, it is found that the ICF control with CVF mainly faces two problems. Firstly, the CVF can be seen as a positive feedback loop, and it tends to cause low-frequency oscillation, especially in weak grid. Secondly, low-frequency harmonics in the grid voltage can easily distort the grid-side current of the inverter, even though the inverter-side current has been regulated well. In order to solve these two problems simultaneously, this paper proposes a novel inverter-side current control method, which adds a high-pass filter into the CVF path. In this paper, the design process of the high-pass filter parameters is analyzed, and the specific voltage feedforward structure of the proposed method to avoid the inverter startup inrush current is also discussed in detail. Simulations in MATLAB/SIMULINK and experiments based on a 6.6 kW prototype have been utilized to verify the effectiveness of the proposed method. INDEX TERMS LCL filters, inverter-side current feedback, capacitor voltage feedforward, low-frequency oscillation, weak grid, high-pass filter.

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Section: Grid Voltage Harmonic Suppressionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Novel Inverter-Side Current Control Method of $LCL$ -Filtered Inverters Based on High-Pass- Filtered Capacitor Voltage Feedforward

Zhou

2020

IEEE Access

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“…• Stability enhancement functionalities are crucial in power-electronics dominated grids. One of the most popular methods to damp systems interactions is impedance emulation and passivity-based design [162], for both of which current-controlled structures showed to be effective. However, there is no solid design methodology to attain the desired output impedance shaping.…”

Section: Future Trendsmentioning

confidence: 99%

Review and Comparison of Grid-Tied Inverter Controllers in Microgrids

Caldognetto¹

2020

Preprint

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<div><div><div><p>Grid-tied inverters are widely used for interfacing renewable energy sources or storage devices to low-voltage electrical power distribution systems. Lately, a number of different control techniques have been proposed to address the emerging requirements of the smart power system scenario, in terms of both functionalities and performance. This paper reviews the techniques proposed for the implementation of current-controlled or voltage-controlled inverters in microgrids. By referring to a voltage source inverter with LCL output filter, the different control architectures are classified as single-, double-, and triple- loop. Then, the functionalities that are needed or recommended in the grid-connected, islanded, and autonomous operating modes of the grid-tied inverter are identified and their implementation in the different control structures is discussed. To validate the analysis and to better illustrate the merits and limitations of the most effective solutions, six control strategies are finally implemented and experimentally compared on a single-phase, grid-connected inverter setup.</p></div></div></div>

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“…Hence, active damping is preferred to passive damping due to its high efficiency and flexibility. Various kinds of active damping methods are used in the literature [10][11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Coupling effect analysis and control for grid‐connected multi‐microgrid clusters

Akhavan

Mohammadi

Vasquez

et al. 2020

IET Power Electronics

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The parallel grid-connected inverters are coupled due to grid impedance, which introduces multiple resonances and might lead to instability of the whole system. Hence, considering the coupling effect among inverters and achieving a solution for resonance damping is necessary for designing the control system. With increasing the influence of microgrids, the interconnection of microgrids is inevitable. Therefore, new challenges emerge with the interconnection of microgrids. It can be expected that the impedance of connection lines and grid impedance, play the most important role in the coupling of microgrids. Accordingly, the coupling effect among microgrids should be considered in control system design as well as considering the coupling effect among parallel inverters. Otherwise, the interconnection of microgrids might degrade the quality of grid injected current, while the injected current of each microgrid satisfies the standards when it is individually connected. In this study, the coupling effect between the two interconnected microgrids is investigated. Also, the control system design for inverters considering the coupling effect among parallel inverters inside a microgrid and coupling effect of other microgrid is clarified, elaborately. Several simulations and experimental results on a small-scale laboratory prototype verify the validity of the theoretical analysis and the effectiveness of the proposed scheme.

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Passivity-Based Design of Plug-and-Play Current-Controlled Grid-Connected Inverters

Cited by 80 publications

References 45 publications

A Novel Inverter-Side Current Control Method of $LCL$ -Filtered Inverters Based on High-Pass- Filtered Capacitor Voltage Feedforward

A Novel Inverter-Side Current Control Method of $LCL$ -Filtered Inverters Based on High-Pass- Filtered Capacitor Voltage Feedforward

Review and Comparison of Grid-Tied Inverter Controllers in Microgrids

Coupling effect analysis and control for grid‐connected multi‐microgrid clusters

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