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Numerically Enhanced Interfacings for Average-Value Models of Voltage-Source Converters in Nodal-Based EMT Simulators

Author

Listed:
  • Seyyedmilad Ebrahimi

    (School of Electrical Engineering and Computer Science, Washington State University, Pullman, WA 99163, USA)

  • Juri Jatskevich

    (Department of Electrical and Computer Engineering, The University of British Columbia, Vancouver, BC V6T 1Z4, Canada)

Abstract

Efficient simulations of converter-dominated power systems and microgrids significantly rely on average-value models (AVMs) of the converters. The conventional AVMs of voltage-source converters (VSCs) typically require a time-step delay for interfacing with the external circuits in non-iterative nodal-based electromagnetic transient (EMT) programs. This time-step relaxation may lead to numerical inaccuracy and/or instability for simulations with large time-step sizes. This paper presents several alternative formulations and interfacing techniques for AVMs of VSCs, which eliminate undesirable time-step delays and result in robust and reliable interfaces that allow simulations at large time steps without significant compromise in numerical accuracy. This is achieved by formulating the VSCs as conductance matrices (and history terms), which are computed simultaneously with the solution of the external network. The advantages of the proposed techniques over the conventional methods are demonstrated in simulations of a VSC-dominated power system using the EMT program PSCAD.

Suggested Citation

  • Seyyedmilad Ebrahimi & Juri Jatskevich, 2025. "Numerically Enhanced Interfacings for Average-Value Models of Voltage-Source Converters in Nodal-Based EMT Simulators," Energies, MDPI, vol. 18(16), pages 1-20, August.
    • Handle: RePEc:gam:jeners:v:18:y:2025:i:16:p:4400-:d:1727024
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    References listed on IDEAS

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    1. Youngho Cho & Kyeon Hur & Yong Cheol Kang & Eduard Muljadi, 2017. "Impedance-Based Stability Analysis in Grid Interconnection Impact Study Owing to the Increased Adoption of Converter-Interfaced Generators," Energies, MDPI, vol. 10(9), pages 1-17, September.
    2. Tarek Abedin & M. Shahadat Hossain Lipu & Mahammad A. Hannan & Pin Jern Ker & Safwan A. Rahman & Chong Tak Yaw & Sieh K. Tiong & Kashem M. Muttaqi, 2021. "Dynamic Modeling of HVDC for Power System Stability Assessment: A Review, Issues, and Recommendations," Energies, MDPI, vol. 14(16), pages 1-25, August.
    3. Haibao Zhai & Shaoqi Yu & Weizheng Gong & Sihan Mei & Meiling Ma & Dong Han, 2025. "Novel Topological Aggregation Method for Grid-Forming Converters of Renewable Energy with Threshold Correction," Energies, MDPI, vol. 18(4), pages 1-19, February.
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