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Modeling of Non-Characteristic Third Harmonics Produced by Voltage Source Converter under Unbalanced Condition

Author

Listed:
  • Min Zhang

    (State Grid Shanxi Electric Power Research Institute, Taiyuan 030024, China)

  • Huiqiang Zhi

    (State Grid Shanxi Electric Power Research Institute, Taiyuan 030024, China)

  • Shifeng Zhang

    (State Grid Shanxi Electric Power Research Institute, Taiyuan 030024, China)

  • Rui Fan

    (State Grid Shanxi Electric Power Research Institute, Taiyuan 030024, China)

  • Ran Li

    (State Grid Shanxi Electric Power Research Institute, Taiyuan 030024, China)

  • Jinhao Wang

    (State Grid Shanxi Electric Power Research Institute, Taiyuan 030024, China)

Abstract

A three-phase three-wire voltage source converter (VSC) can produce third harmonics when it is operated under an unbalanced condition. It is essential to understand the mechanism of the production of this third harmonic and to assess its impact on power systems. Therefore, this paper presents an analytical model of the VSC under the unbalanced condition through mathematical derivations, and the final model is a coupled Thevenin circuit. The proposed model allows for direct computation of the non-characteristic third harmonics through harmonic power flow studies. The results show that VSC under unbalanced conditions emits both positive-sequence and negative-sequence third harmonics, and that the positive-sequence third harmonic is much larger than the negative-sequence third harmonic. It also shows that the unbalanced level and the size of the dc-link capacitor are critical to the level of non-characteristic third harmonics. The correctness of the proposed model and its application on noncharacteristic third harmonic evaluations have been verified using EMT simulations.

Suggested Citation

  • Min Zhang & Huiqiang Zhi & Shifeng Zhang & Rui Fan & Ran Li & Jinhao Wang, 2022. "Modeling of Non-Characteristic Third Harmonics Produced by Voltage Source Converter under Unbalanced Condition," Sustainability, MDPI, vol. 14(11), pages 1-15, May.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:11:p:6449-:d:823632
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    References listed on IDEAS

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    1. Sivakavi Naga Venkata Bramareswara Rao & Yellapragada Venkata Pavan Kumar & Darsy John Pradeep & Challa Pradeep Reddy & Aymen Flah & Habib Kraiem & Jawad F. Al-Asad, 2022. "Power Quality Improvement in Renewable-Energy-Based Microgrid Clusters Using Fuzzy Space Vector PWM Controlled Inverter," Sustainability, MDPI, vol. 14(8), pages 1-20, April.
    2. Reza Sirjani, 2017. "Optimal Capacitor Placement in Wind Farms by Considering Harmonics Using Discrete Lightning Search Algorithm," Sustainability, MDPI, vol. 9(9), pages 1-20, September.
    3. Muhammad Naveed Iqbal & Lauri Kütt & Kamran Daniel & Bilal Asad & Payam Shams Ghahfarokhi, 2021. "Estimation of Harmonic Emission of Electric Vehicles and Their Impact on Low Voltage Residential Network," Sustainability, MDPI, vol. 13(15), pages 1-17, July.
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