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The Stability Analysis of a Multi-Port Single-Phase Solid-State Transformer in the Electromagnetic Timescale

Author

Listed:
  • Rui Wang

    (College of Information Science and Engineering, Northeastern University, Shenyang 110004, China)

  • Qiuye Sun

    (College of Information Science and Engineering, Northeastern University, Shenyang 110004, China
    State Key Laboratory of Synthetical Automation for Process Industries, Northeastern University, Shenyang 110004, China)

  • Qifu Cheng

    (College of Information Science and Engineering, Northeastern University, Shenyang 110004, China
    State Grid Shenyang Electric Power Supply Company, Shenyang 110004, China)

  • Dazhong Ma

    (College of Information Science and Engineering, Northeastern University, Shenyang 110004, China)

Abstract

This paper proposes an overall practical stability assessment for a multi-port single-phase solid-state transformer (MS3T) in the electromagnetic timescale. When multiple stable subsystems are combined into one MS3T, the newly formed MS3T has a certain possibility to be unstable. Thus, this paper discusses the stability assessment of the MS3T in detail. First and foremost, the structure of the MS3T and its three stage control strategies are proposed. Furthermore, the stability analysis of each of the MS3T’s subsystems is achieved through the closed loop transfer function of each subsystem, respectively, including an AC-DC front-end side converter, dual active bridge (DAB) with a high-frequency (HF) or medium-frequency (MF) transformer, and back-end side incorporating DC-AC and dc-dc converters. Furthermore, the practical impedance stability criterion in the electromagnetic timescale, which only requires two current sensors and one external high-bandwidth small-signal sinusoidal perturbation current source, is proposed by the Gershgorin theorem and Kirchhoff laws. Finally, the overall stability assessment, based on a modified impedance criterion for the MS3T is investigated. The overall practical stability assessment of the MS3T can be validated through extensive simulation and hardware results.

Suggested Citation

  • Rui Wang & Qiuye Sun & Qifu Cheng & Dazhong Ma, 2018. "The Stability Analysis of a Multi-Port Single-Phase Solid-State Transformer in the Electromagnetic Timescale," Energies, MDPI, vol. 11(9), pages 1-22, August.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:9:p:2250-:d:166050
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    References listed on IDEAS

    as
    1. Hyeok-Jin Yun & Ho-Sung Kim & Myoungho Kim & Ju-Won Baek & Hee-Je Kim, 2018. "A DAB Converter with Common-Point-Connected Winding Transformers Suitable for a Single-Phase 5-Level SST System," Energies, MDPI, vol. 11(4), pages 1-16, April.
    2. Peng Shen & Lin Guan & Zhenlin Huang & Liang Wu & Zetao Jiang, 2018. "Active-Current Control of Large-Scale Wind Turbines for Power System Transient Stability Improvement Based on Perturbation Estimation Approach," Energies, MDPI, vol. 11(8), pages 1-15, August.
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    Cited by:

    1. Stefano Farnesi & Mario Marchesoni & Massimiliano Passalacqua & Luis Vaccaro, 2019. "Solid-State Transformers in Locomotives Fed through AC Lines: A Review and Future Developments," Energies, MDPI, vol. 12(24), pages 1-29, December.
    2. Yuyang Li & Qiuye Sun & Danlu Wang & Sen Lin, 2019. "A Virtual Inertia-Based Power Feedforward Control Strategy for an Energy Router in a Direct Current Microgrid Application," Energies, MDPI, vol. 12(3), pages 1-14, February.

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