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Impedance Modeling and Stability Analysis of Three-Phase Four-Wire Inverter with Grid-Connected Operation

Author

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  • Guoli Feng

    (College of Electrical Engineering, Navel University of Engineering, JieFang Road 717, Wuhan 430000, China)

  • Zhihao Ye

    (College of Electrical Engineering, Navel University of Engineering, JieFang Road 717, Wuhan 430000, China)

  • Yihui Xia

    (College of Electrical Engineering, Navel University of Engineering, JieFang Road 717, Wuhan 430000, China)

  • Liming Huang

    (College of Electrical Engineering, Navel University of Engineering, JieFang Road 717, Wuhan 430000, China)

  • Zerun Wang

    (College of Electrical Engineering, Navel University of Engineering, JieFang Road 717, Wuhan 430000, China)

Abstract

With the continuous penetration and development of renewable energy power generation, distributed grids and microgrids are becoming increasingly important in power systems. In the distribution networks and microgrids, the grid impedance is comparatively large and cannot be ignored. Usually, the parallel compensation is used to improve the grid quality. In these three-phase four-wire power systems, analyzing the impedance characteristics of the grid-connected inverter is vital to carry out the small-signal stability analysis. Thus, it is vital to consider the influence of the zero-sequence component in addition to the positive-sequence component and the negative-sequence component when it comes to analyzing system stability. In this paper, the impedances of three-phase four-wire split capacitor inverter and three-phase four-leg inverter are established. Based on the achieved impedance, the similarities and differences between the impedances of three-phase four-wire split capacitor inverter and impedance of three-phase four-leg inverter are studied. The main difference is reflected in zero-sequence impedance. Additionally, the zero-sequence impedance characteristics and the dominating factors deciding the zero-sequence impedance are analyzed. Then, the stability of the system considering the grid impedance and impedance of three-phase four-wire inverter is investigated by separately considering the stability of the positive–negative-sequence component and the stability of the zero-sequence component. Several cases of small-signal instability caused by the positive–negative-sequence component or zero-sequence component are revealed. The experimental results validate the theoretical analysis.

Suggested Citation

  • Guoli Feng & Zhihao Ye & Yihui Xia & Liming Huang & Zerun Wang, 2022. "Impedance Modeling and Stability Analysis of Three-Phase Four-Wire Inverter with Grid-Connected Operation," Energies, MDPI, vol. 15(8), pages 1-26, April.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:8:p:2754-:d:789931
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    References listed on IDEAS

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    1. Ahmad, Fiaz & Rasool, Akhtar & Ozsoy, Emre & Sekar, Raja & Sabanovic, Asif & Elitaş, Meltem, 2018. "Distribution system state estimation-A step towards smart grid," Renewable and Sustainable Energy Reviews, Elsevier, vol. 81(P2), pages 2659-2671.
    2. Shaojian Song & Peichen Guan & Bin Liu & Yimin Lu & Huihwang Goh, 2021. "Impedance Modeling and Stability Analysis of DFIG-Based Wind Energy Conversion System Considering Frequency Coupling," Energies, MDPI, vol. 14(11), pages 1-22, June.
    3. Yunyang Xu & Heng Nian & Yangming Wang & Dan Sun, 2020. "Impedance Modeling and Stability Analysis of VSG Controlled Grid-Connected Converters with Cascaded Inner Control Loop," Energies, MDPI, vol. 13(19), pages 1-21, October.
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    Cited by:

    1. Xiaojie Zhou & Dezhi Xu & Yourui Huang, 2022. "Impedance Characteristics and Harmonic Analysis of LCL-Type Grid-Connected Converter Cluster," Energies, MDPI, vol. 15(10), pages 1-18, May.

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