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The Definition of Power Grid Strength and Its Calculation Methods for Power Systems with High Proportion Nonsynchronous-Machine Sources

Author

Listed:
  • Zheng Xu

    (Department of Electrical Engineering, Zhejiang University, Hangzhou 310027, China)

  • Nan Zhang

    (Department of Electrical Engineering, Zhejiang University, Hangzhou 310027, China)

  • Zheren Zhang

    (Department of Electrical Engineering, Zhejiang University, Hangzhou 310027, China)

  • Ying Huang

    (Department of Electrical Engineering, Zhejiang University, Hangzhou 310027, China)

Abstract

This paper studies the definition and calculation method of power grid strength in the environment of high-proportion nonsynchronous-machine sources, focusing on the effect of nonsynchronous-machine sources on voltage support strength and frequency support strength. By dividing the nonsynchronous-machine sources into four types, the equivalent circuits of each type under normal state and fault state are derived, respectively. Based on the Thevenin equivalent impedance of the power grid and the equivalent impedance of the connected device, the definition and calculation method of voltage support strength is given, and the new meaning of single-infeed short-circuit ratio and multi-infeed short-circuit ratio in the context of high proportion nonsynchronous-machine sources is presented. Based on the initial frequency change rate and the steady-state frequency deviation of any node in the power grid under the maximum expected active power disturbance, the equivalent inertia lifting factor and steady-state frequency deviation decreasing factor are defined, respectively, to describe the contribution of nonsynchronous-machine sources to the power grid frequency support strength, and the calculation methods of the equivalent inertia lifting factor and the steady-state frequency deviation decreasing factor are given.

Suggested Citation

  • Zheng Xu & Nan Zhang & Zheren Zhang & Ying Huang, 2023. "The Definition of Power Grid Strength and Its Calculation Methods for Power Systems with High Proportion Nonsynchronous-Machine Sources," Energies, MDPI, vol. 16(4), pages 1-23, February.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:4:p:1842-:d:1066587
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    References listed on IDEAS

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    1. Rossano Musca & Francisco Gonzalez-Longatt & Cesar A. Gallego Sánchez, 2022. "Power System Oscillations with Different Prevalence of Grid-Following and Grid-Forming Converters," Energies, MDPI, vol. 15(12), pages 1-19, June.
    2. Zheng Xu, 2022. "Three Technical Challenges Faced by Power Systems in Transition," Energies, MDPI, vol. 15(12), pages 1-21, June.
    3. Fernández-Guillamón, Ana & Gómez-Lázaro, Emilio & Muljadi, Eduard & Molina-García, Ángel, 2019. "Power systems with high renewable energy sources: A review of inertia and frequency control strategies over time," Renewable and Sustainable Energy Reviews, Elsevier, vol. 115(C).
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