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Effect of Load Change on the Thevenin Equivalent Impedance of Power System

Author

Listed:
  • Tiankui Sun

    (Department of Electrical Engineering, Harbin Institute of Technology, 150001 Harbin, China)

  • Zhimin Li

    (Department of Electrical Engineering, Harbin Institute of Technology, 150001 Harbin, China)

  • Shuang Rong

    (Department of Electrical Engineering, Harbin Institute of Technology, 150001 Harbin, China)

  • Jian Lu

    (Department of Electrical and Computer Engineering, North Carolina State University, Raleigh, NC 27606, USA)

  • Weixing Li

    (Department of Electrical Engineering, Harbin Institute of Technology, 150001 Harbin, China)

Abstract

This paper discusses the effect of load change on the Thevenin equivalent impedance of power systems. In this paper, the Thevenin equivalent impedance influenced by the derivative of active load with respect to reactive load (dP dQ) is analyzed. The Thevenin equivalent impedance forms a closed curve in a complex plane and shrinks to one point when voltage collapses. The magnitude of the Thevenin equivalent impedance at the collapse point is equal to the magnitude of the load impedance. Therefore, the impedance match theory still holds under the effect of the load change. These features are verified on a New England 39-bus system.

Suggested Citation

  • Tiankui Sun & Zhimin Li & Shuang Rong & Jian Lu & Weixing Li, 2017. "Effect of Load Change on the Thevenin Equivalent Impedance of Power System," Energies, MDPI, vol. 10(3), pages 1-6, March.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:3:p:330-:d:92477
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    Cited by:

    1. Heng-Yi Su & Tzu-Yi Liu, 2017. "A PMU-Based Method for Smart Transmission Grid Voltage Security Visualization and Monitoring," Energies, MDPI, vol. 10(8), pages 1-16, July.
    2. Martin Kanálik & Anastázia Margitová & Ľubomír Beňa & Andrea Kanáliková, 2020. "Power System Impedance Estimation Using a Fast Voltage and Current Changes Measurements," Energies, MDPI, vol. 14(1), pages 1-22, December.
    3. Heng-Yi Su & Tzu-Yi Liu, 2017. "GECM-Based Voltage Stability Assessment Using Wide-Area Synchrophasors," Energies, MDPI, vol. 10(10), pages 1-16, October.
    4. Anan Zhang & Huang Huang & Wei Yang & Hongwei Li, 2019. "Multivariable Regression Equivalent Model of Interconnected Active Distribution Networks Based on Boundary Measurement," Energies, MDPI, vol. 12(12), pages 1-17, June.

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