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Phase-Locked Loop Research of Grid-Connected Inverter Based on Impedance Analysis

Author

Listed:
  • Yuxia Jiang

    (State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Baoding 071003, Hebei, China)

  • Yonggang Li

    (State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Baoding 071003, Hebei, China)

  • Yanjun Tian

    (State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Baoding 071003, Hebei, China)

  • Luo Wang

    (State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Baoding 071003, Hebei, China)

Abstract

In order to improve the phenomenon that a traditional phase-locked loop based on a double second-order generalized integrator (DSOGI-PLL) cannot track signal amplitude and phase accurately when the input signal contains DC components and high-order harmonics, the structure of a second-order generalized integrator-quadrature signals generator (SOGI-QSG) is modified. The paper establishes the impedance model considering the DSOGI-PLL structure of the inductor-capacitor-inductor-type (LCL-type) inverter grid-connected system adopting current control measured from the grid terminal in alternating current side, introducing voltage feedback control to enhance the stability of the system. Meanwhile, analyzing the influence of parameters on impedance according to the impedance model established preferable design parameters. The improvement in SOGI-QSG structure is good for PLL to lock the grid voltage phase more accurately and the retrofitting in control strategy based on the impedance is able to uplift the inverter output impedance phase which is conducive to system stability by increasing the phase margin of the system. The simulation in Matlab/Simulink is carried out to verify the effectiveness of the proposed control strategy.

Suggested Citation

  • Yuxia Jiang & Yonggang Li & Yanjun Tian & Luo Wang, 2018. "Phase-Locked Loop Research of Grid-Connected Inverter Based on Impedance Analysis," Energies, MDPI, vol. 11(11), pages 1-21, November.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:11:p:3077-:d:181411
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    References listed on IDEAS

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    1. Matthias Schiesser & Sébastien Wasterlain & Mario Marchesoni & Mauro Carpita, 2018. "A Simplified Design Strategy for Multi-Resonant Current Control of a Grid-Connected Voltage Source Inverter with an LCL Filter," Energies, MDPI, vol. 11(3), pages 1-15, March.
    2. Sohail Khan & Benoit Bletterie & Adolfo Anta & Wolfgang Gawlik, 2018. "On Small Signal Frequency Stability under Virtual Inertia and the Role of PLLs," Energies, MDPI, vol. 11(9), pages 1-18, September.
    3. Nanmu Hui & Dazhi Wang & Yunlu Li, 2018. "An Efficient Hybrid Filter-Based Phase-Locked Loop under Adverse Grid Conditions," Energies, MDPI, vol. 11(4), pages 1-18, March.
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    Cited by:

    1. Michał Gwóźdź & Łukasz Ciepliński, 2021. "An Algorithm for Calculation and Extraction of the Grid Voltage Component," Energies, MDPI, vol. 14(16), pages 1-12, August.
    2. Zakiud Din & Jianzhong Zhang & Hussain Bassi & Muhyaddin Rawa & Yipeng Song, 2020. "Impact of Phase Locked Loop with Different Types and Control Dynamics on Resonance of DFIG System," Energies, MDPI, vol. 13(5), pages 1-26, February.
    3. Liang Zhang & Kang Chen & Ling Lyu & Guowei Cai, 2019. "Research on the Operation Control Strategy of a Low-Voltage Direct Current Microgrid Based on a Disturbance Observer and Neural Network Adaptive Control Algorithm," Energies, MDPI, vol. 12(6), pages 1-17, March.

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