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Hierarchical Control with Fast Primary Control for Multiple Single-Phase Electric Springs

Author

Listed:
  • Qingsong Wang

    (School of Electrical Engineering, Southeast University, Nanjing 210096, China)

  • Wujian Zuo

    (School of Electrical Engineering, Southeast University, Nanjing 210096, China
    State Grid Huzhou Power Supply Company, Huzhou 313000, China)

  • Ming Cheng

    (School of Electrical Engineering, Southeast University, Nanjing 210096, China)

  • Fujin Deng

    (School of Electrical Engineering, Southeast University, Nanjing 210096, China)

  • Giuseppe Buja

    (Department of Industrial Engineering, University of Padova, 35131 Padova, Italy)

Abstract

An electric spring (ES) is a new power compensation device which becomes useful for the large-scale integration of renewable energy sources into the grid. However, when the grid contains two or more ESs connected at different nodes, a voltage drop occurs between the nodes due to the line impedance. Therefore, the voltage of the ES-stabilized nodes cannot be set at the same reference (e.g., 220 V), otherwise one or more ESs break away because of the voltage windup. In this paper, a hierarchical control of multiple ESs tied to a microgrid is proposed to account for the line voltage drop. The primary control relies on the power decoupling control; it is designed for islanded operation of the microgrid, which improves the dynamics of both the voltage and frequency regulation. The secondary control relies on the droop control; it is introduced to coordinate the operation of the ESs by modifying the reference voltage of each ES dynamically. Advantages and disadvantages of the proposed hierarchical control are analyzed together with the explanations of the algorithms developed for its realization. At last, effectiveness of the arranged control system is validated by simulations on the MATLAB/Simulink platform.

Suggested Citation

  • Qingsong Wang & Wujian Zuo & Ming Cheng & Fujin Deng & Giuseppe Buja, 2019. "Hierarchical Control with Fast Primary Control for Multiple Single-Phase Electric Springs," Energies, MDPI, vol. 12(18), pages 1-15, September.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:18:p:3511-:d:266571
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    Cited by:

    1. Wilson Pavon & Esteban Inga & Silvio Simani & Matthew Armstrong, 2023. "Optimal Hierarchical Control for Smart Grid Inverters Using Stability Margin Evaluating Transient Voltage for Photovoltaic System," Energies, MDPI, vol. 16(5), pages 1-16, March.

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