Impedance Model for Instability Analysis of LCC-HVDCs Considering Transformer Saturation

doi:10.35833/MPCE.2023.000340

Home > Archive>Volume 12, Issue 4, 2024 >1309-1319. DOI:10.35833/MPCE.2023.000340

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Impedance Model for Instability Analysis of LCC-HVDCs Considering Transformer Saturation

DOI:

10.35833/MPCE.2023.000340

Author:

Qin Jiang ^{^1,2}
Qin Jiang
College of Electrical Engineering, Sichuan University, Chengdu 610065, China, and they are also with;Smart Grid Key Laboratory of Sichuan Province, Chengdu 610065, China
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Ruiting Xu ^{^1,2}
Ruiting Xu
College of Electrical Engineering, Sichuan University, Chengdu 610065, China, and they are also with;Smart Grid Key Laboratory of Sichuan Province, Chengdu 610065, China
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Baohong Li ^{^1,2}
Baohong Li
College of Electrical Engineering, Sichuan University, Chengdu 610065, China, and they are also with;Smart Grid Key Laboratory of Sichuan Province, Chengdu 610065, China
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Xiang Chen ^{^1,2}
Xiang Chen
College of Electrical Engineering, Sichuan University, Chengdu 610065, China, and they are also with;Smart Grid Key Laboratory of Sichuan Province, Chengdu 610065, China
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Yue Yin ^{^1,2}
Yue Yin
College of Electrical Engineering, Sichuan University, Chengdu 610065, China, and they are also with;Smart Grid Key Laboratory of Sichuan Province, Chengdu 610065, China
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Tianqi Liu ^{^1,2}
Tianqi Liu
College of Electrical Engineering, Sichuan University, Chengdu 610065, China, and they are also with;Smart Grid Key Laboratory of Sichuan Province, Chengdu 610065, China
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Frede Blaabjerg ^³
Frede Blaabjerg
Department of Energy Technology, Aalborg University, Aalborg 9920, Denmark
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Affiliation:

1.College of Electrical Engineering, Sichuan University, Chengdu 610065, China, and they are also with;2.Smart Grid Key Laboratory of Sichuan Province, Chengdu 610065, China;3.Department of Energy Technology, Aalborg University, Aalborg 9920, Denmark

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Abstract:

In line commutated converter based high-voltage direct current (LCC-HVDC) transmission systems, the transformer saturation can induce harmonic instability, which poses a serious threat to the safe operation of the power system. However, the nonlinear characteristics of the power grids introduced by the transformer saturation considerably limit the application of the conventional analysis methods. To address the issue, this paper derives a linear model for the transformer saturation caused by the DC current due to the converter modulation. Afterwards, the nonlinear characteristics of power grids with the transformer saturation is described by a complex valued impedance matrix. Based on the derived impedance matrix, the system harmonic stability is analyzed and the mechanism of the transformer saturation induced harmonic instability is revealed. Finally, the sensitivity analysis is conducted to find the key factors that influence the system core saturation instability. The proposed impedance model is verified by the electromagnetic transient simulation, and the simulation results corroborate the effectiveness of the proposed impedance model.

Key words:Line commutated converter based high voltage direct current (LCC-HVDC) ; transformer saturation ; harmonic instability ; impedance model

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Received:May 22,2023
Revised:September 17,2022
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Online: July 30,2024
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