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A Two-Step State Estimation Algorithm for Hybrid AC-DC Distribution Grids

Author

Listed:
  • Gaurav Kumar Roy

    (Institute for Automation of Complex Power Systems, RWTH Aachen University, 52062 Aachen, Germany)

  • Marco Pau

    (Institute for Automation of Complex Power Systems, RWTH Aachen University, 52062 Aachen, Germany)

  • Ferdinanda Ponci

    (Institute for Automation of Complex Power Systems, RWTH Aachen University, 52062 Aachen, Germany)

  • Antonello Monti

    (Institute for Automation of Complex Power Systems, RWTH Aachen University, 52062 Aachen, Germany)

Abstract

Direct Current (DC) grids are considered an attractive option for integrating high shares of renewable energy sources in the electrical distribution grid. Hence, in the future, Alternating Current (AC) and DC systems could be interconnected to form hybrid AC-DC distribution grids. This paper presents a two-step state estimation formulation for the monitoring of hybrid AC-DC grids. In the first step, state estimation is executed independently for the AC and DC areas of the distribution system. The second step refines the estimation results by exchanging boundary quantities at the AC-DC converters. To this purpose, the modulation index and phase angle control of the AC-DC converters are integrated into the second step of the proposed state estimation formulation. This allows providing additional inputs to the state estimation algorithm, which eventually leads to improve the accuracy of the state estimation results. Simulations on a sample AC-DC distribution grid are performed to highlight the benefits resulting from the integration of these converter control parameters for the estimation of both the AC and DC grid quantities.

Suggested Citation

  • Gaurav Kumar Roy & Marco Pau & Ferdinanda Ponci & Antonello Monti, 2021. "A Two-Step State Estimation Algorithm for Hybrid AC-DC Distribution Grids," Energies, MDPI, vol. 14(7), pages 1-21, April.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:7:p:1967-:d:529091
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    References listed on IDEAS

    as
    1. Motaz Ayiad & Helder Leite & Hugo Martins, 2020. "State Estimation for Hybrid VSC Based HVDC/AC Transmission Networks," Energies, MDPI, vol. 13(18), pages 1-27, September.
    2. Hakim Azaioud & Robbert Claeys & Jos Knockaert & Lieven Vandevelde & Jan Desmet, 2021. "A Low-Voltage DC Backbone with Aggregated RES and BESS: Benefits Compared to a Traditional Low-Voltage AC System," Energies, MDPI, vol. 14(5), pages 1-28, March.
    3. Sungchul Hwang & Sungyoon Song & Gilsoo Jang & Minhan Yoon, 2019. "An Operation Strategy of the Hybrid Multi-Terminal HVDC for Contingency," Energies, MDPI, vol. 12(11), pages 1-22, May.
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    Cited by:

    1. Abdulwahab A. Aljabrine & Abdallah A. Smadi & Yacine Chakhchoukh & Brian K. Johnson & Hangtian Lei, 2021. "Resiliency Improvement of an AC/DC Power Grid with Embedded LCC-HVDC Using Robust Power System State Estimation," Energies, MDPI, vol. 14(23), pages 1-17, November.

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