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

Min Zhang, Huiqiang Zhi, Shifeng Zhang, Rui Fan, Ran Li and Jinhao Wang
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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

Sustainability, 2022, vol. 14, issue 11, 1-15

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.

Keywords: voltage source converter; unbalanced condition; non-characteristic third harmonic; harmonic modeling (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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