3D modeling of an HVDC converter transformer and its application on the electrical field of windings subject to voltage harmonics
•The voltage harmonics in valve winding of converter transformers are analyzed.•An excellent agreement between simulation and measurement is achieved.•Electric field is simulated on a 3D converter transformer model.•High dV/dt is observed and its influence on partial discharge behavior is analyzed....
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| Published in | International journal of electrical power & energy systems Vol. 117; p. 105581 |
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| Main Authors | , , , , , |
| Format | Journal Article |
| Language | English |
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Elsevier Ltd
01.05.2020
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| Abstract | •The voltage harmonics in valve winding of converter transformers are analyzed.•An excellent agreement between simulation and measurement is achieved.•Electric field is simulated on a 3D converter transformer model.•High dV/dt is observed and its influence on partial discharge behavior is analyzed.
Converter transformers are key facilities in HVDC systems. The operation condition of converter transformers is more complex than that of conventional AC transformers. Because of the superposition of the voltage harmonics, the valve voltage wave is more serrated than a pure AC voltage. As a result, the insulation system withstands severe stress. Several tasks are accomplished in this study to obtain a better understanding of the electrical field distribution in converter transformers as well as analyze the effects of voltage harmonics on the main insulation of converter transformers. First, an HVDC system with a voltage of ±800 kV is simulated and the voltage harmonics at the valve side are obtained. The simulation is verified based on the measurement in a real ±800 kV HVDC substation. The harmonics in valve winding are mainly characterized by components with frequencies of 6k, 12k, 12k ± 1, and 6k ± 1. Then, a full-scaled 3D converter transformer model is proposed. The electric field of the proposed model is calculated under AC, DC, and polarity reversal voltages. Compared with conventional 2D models, the inhomogeneity of the electric field distribution is obtained, and the difference can reach 30%. Finally, the valve voltage waveform is applied on the 3D model to calculate the electric field using finite element method. Results show that the voltage harmonics in valve side further deepen the inhomogeneity of electric field in insulation structures. Moreover, a high value of voltage changing rate (dV/dt) with value 2.96 kV/μs is observed in simulation. The influence of defects on partial discharge within insulation materials under the voltage harmonics is also analyzed. |
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| AbstractList | •The voltage harmonics in valve winding of converter transformers are analyzed.•An excellent agreement between simulation and measurement is achieved.•Electric field is simulated on a 3D converter transformer model.•High dV/dt is observed and its influence on partial discharge behavior is analyzed.
Converter transformers are key facilities in HVDC systems. The operation condition of converter transformers is more complex than that of conventional AC transformers. Because of the superposition of the voltage harmonics, the valve voltage wave is more serrated than a pure AC voltage. As a result, the insulation system withstands severe stress. Several tasks are accomplished in this study to obtain a better understanding of the electrical field distribution in converter transformers as well as analyze the effects of voltage harmonics on the main insulation of converter transformers. First, an HVDC system with a voltage of ±800 kV is simulated and the voltage harmonics at the valve side are obtained. The simulation is verified based on the measurement in a real ±800 kV HVDC substation. The harmonics in valve winding are mainly characterized by components with frequencies of 6k, 12k, 12k ± 1, and 6k ± 1. Then, a full-scaled 3D converter transformer model is proposed. The electric field of the proposed model is calculated under AC, DC, and polarity reversal voltages. Compared with conventional 2D models, the inhomogeneity of the electric field distribution is obtained, and the difference can reach 30%. Finally, the valve voltage waveform is applied on the 3D model to calculate the electric field using finite element method. Results show that the voltage harmonics in valve side further deepen the inhomogeneity of electric field in insulation structures. Moreover, a high value of voltage changing rate (dV/dt) with value 2.96 kV/μs is observed in simulation. The influence of defects on partial discharge within insulation materials under the voltage harmonics is also analyzed. |
| ArticleNumber | 105581 |
| Author | Zhou, Kuiyu Sun, Weidong Yang, Lijun Zare, Firuz Xia, YanWei Cheng, Li |
| Author_xml | – sequence: 1 givenname: Weidong surname: Sun fullname: Sun, Weidong organization: State Key Laboratory of Power Equipment & System Security and New Technology, College of Electrical Engineering, Chongqing University, Chongqing 400044, China – sequence: 2 givenname: Lijun surname: Yang fullname: Yang, Lijun email: yljcqu@cqu.edu.cn organization: State Key Laboratory of Power Equipment & System Security and New Technology, College of Electrical Engineering, Chongqing University, Chongqing 400044, China – sequence: 3 givenname: Firuz surname: Zare fullname: Zare, Firuz organization: School of Information Technology and Electrical Engineering, The University of Queensland, St Lucia, Qld 4072, Australia – sequence: 4 givenname: YanWei surname: Xia fullname: Xia, YanWei organization: Hebei Electric Power Research Institute, Shijiazhuang 050000, Hebei, China – sequence: 5 givenname: Li surname: Cheng fullname: Cheng, Li organization: State Key Laboratory of Power Equipment & System Security and New Technology, College of Electrical Engineering, Chongqing University, Chongqing 400044, China – sequence: 6 givenname: Kuiyu surname: Zhou fullname: Zhou, Kuiyu organization: State Key Laboratory of Power Equipment & System Security and New Technology, College of Electrical Engineering, Chongqing University, Chongqing 400044, China |
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| Cites_doi | 10.1049/iet-epa.2015.0559 10.1109/TMAG.2014.2331697 10.1109/TDEI.2013.6678848 10.1049/ip-gtd:20050008 10.1109/ICPST.2006.321611 10.1109/ICEMS.2011.6073990 10.1109/ICHVE.2016.7800888 10.1109/TDEI.2016.005934 10.1109/TDEI.2019.8726048 10.1109/TDEI.2013.6451364 10.1049/iet-pel.2016.0230 10.1109/TPWRD.2005.852376 10.1109/ICPST.2006.321952 10.1109/TDEI.2015.004650 10.1109/TDEI.2002.1038663 10.1109/ENERGYCON.2010.5771696 10.1109/CEIDP.2013.6747085 10.1109/TDEI.2018.006629 |
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| References_xml | – volume: vol. 1 year: 2016 ident: b0080 article-title: Influence of voltage harmonic phenomena on partial discharge behavior at HVDC publication-title: IEEE International Conference on Dielectrics (ICD) – reference: Yan Li, et al. The calculate of nonlinear and anisotropic electric field in valve side winding of converter transformer. 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| Snippet | •The voltage harmonics in valve winding of converter transformers are analyzed.•An excellent agreement between simulation and measurement is achieved.•Electric... |
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| StartPage | 105581 |
| SubjectTerms | Converter transformer HVDC Partial discharge Voltage changing rate Voltage harmonics |
| Title | 3D modeling of an HVDC converter transformer and its application on the electrical field of windings subject to voltage harmonics |
| URI | https://dx.doi.org/10.1016/j.ijepes.2019.105581 |
| Volume | 117 |
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