DOI: https://doi.org/10.15588/1607-6761-2020-1-3

Monopolar mode of operation of HVDC in the main electric networks of Ukraine

V.V. Kyryk, A.V. Bilyk

Abstract


Purpose. Perform an analysis of the conditions of the direct-current transmission in a monopolar mode in the conditions near the alternating voltage substation located and to conduct a study of the occurrence of a direct current of dc bias in the windings of power transformers of an alternating current that fall into the zone of the induced potential.

Methodology. The basis of the work is based on theoretical studies of the problems related to the operation of power equipment of alternating voltage in the zone of action of the given potential in foreign countries. The results of the research were processed using modern software applications: MathCAD.

Findings. In the course of the work, overtime values of the direct current of magnetization of windings of autotransformers for the Vinnytsia 750 kV substations were obtained, with the location of a transformation substation in the Western Ukrainian Power System of Ukraine, at a 750 kV Western-Ukrainian substation. When operating semiconductor converters in unipolar mode, the direct magnetizing current exceeds the permissible norms by 13% for 330 kV substations and more than 7 times for 750 kV substations.

Originality. The authors carried out a theoretical study, one of the possible options for establishing the transmission of DC in Ukraine, and identified the risks associated with the monopolar mode of operation of the transducer of constant voltage.

Practical value. The results of the work can be used in the design of new DC transmissions (DC inserts) in the power grid of Ukraine in order to increase its export capabilities and also at research of possible operating modes of transfers of a direct current as a part of systems of alternating voltage.


Keywords


direct current transmission; monopolar mode; grounding electrode; dc link; power transformers

References


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[5] Jin Enshu, Yu Kuiying, Chai Fangsen Effects of DC magnetic bias on differential protection of transformer − The International Conference on Advanced Power System Automation and Protection, DOI: 10.1109/APAP.2011.6180789, 2011, pp. 2182-2186.

[6] Yang Yongming, Liu Xingmou, Yang Fan Soil Structure Effect on Transformer DC Bias − IEEE International Conference on Industrial Technology (ICIT), DOI: 10.1109/ICIT.2014.6894954 , Feb. 26 - Mar. 1, 2014, Busan, Korea, pp. 535-540

[7] Yan Li, Yanchao gao, Longnv Li, Di Zhang, Fangxu Han Effects of DC Magnetic Bias on the Magnetic and Sound Fields of Transformer − Energy and Power Engineering, doi:10.4236/epe.2013.54B209, 2013, 5, 1097-1100

[8] Xuesong Zhou, Zhihao Zhou and Youjie Ma Research on DC magnetic Bias of Power Transformer − International Workshop on Information and Electronics Engineering (IWIEE), 2012, pp. 452-455

[9] Zhang Bo,Zhao Jie,Zeng Rong,et al.Estimation of DC Current Distribution in AC Power System Caused by HVDC Transmission System in Ground Return Status − Proceedings of the CSEE. 2006, pp.84-88.

[10] Bo Zhang, Jie Zhao, Rong Zeng Numerical Analysis of DC Current Distribution in AC Power System Near HVDC System − IEEE Transactions on power delivery, DOI: 10.1109/TPWRD.2007.908748, vol. 23, no. 2, April 2008, pp. 960-965

[11] Jin Enshu, Yu Kuiying,Chai Fangsen Effects of DC magnetic bias on differential protection of transformer − The International Conference on Advanced Power System Automation and Protection, DOI: 10.1109/APAP.2011.6180789, October 2011, pp.2182-2186

[12] Rong Zeng, Zhanqing Yu, Jinliang He Study on Restraining DC Neutral Current of Transformer During HVDC Monopolar Operation.− IEEE TRANSACTIONS ON POWER DELIVERY, DOI: 10.1109/TPWRD.2011.2161345, VOL. 26, NO. 4, October 2011, pp.2785-2791

[13] José Eduardo Telles Villas and Carlos Medeiros Portela Calculation of Electric Field and Potential Distributions Into Soil and Air Media for a Ground Electrode of a HVDC System − IEEE TRANSACTIONS ON POWER DELIVERY, DOI: 10.1109/TPWRD.2003.809741, VOL. 18, NO. 3, JULY 2003, pp.867-873

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[4] Guihua Mei, Yuanzhang Sun, Yancun Liu  Simulation on DC Current Distribution in AC Power Grid under HVDC Ground-Return-Mode − Scientific Research J. Electromagnetic Analysis & Applications, DOI: 10.4236/jemaa.2010.27054,  vol. 2, ISSN 1727-9895, 2010, pp. 418-423.

[5] Jin Enshu, Yu Kuiying, Chai Fangsen Effects of  DC magnetic bias on differential protection of transformer −  The International Conference on Advanced Power System Automation and Protection, DOI: 10.1109/APAP.2011.6180789, 2011, pp. 2182-2186.

[6] Yang Yongming, Liu Xingmou, Yang Fan Soil Structure Effect on Transformer DC Bias − IEEE International Conference on Industrial Technology (ICIT), DOI: 10.1109/ICIT.2014.6894954 , Feb. 26 - Mar. 1, 2014, Busan, Korea, pp. 535-540

[7] Yan Li, Yanchao gao, Longnv Li, Di Zhang, Fangxu Han   Effects of DC Magnetic Bias on the Magnetic and Sound Fields of Transformer −  Energy and Power Engineering, doi:10.4236/epe.2013.54B209,  2013, 5, 1097-1100

[8] Xuesong Zhou, Zhihao Zhou and Youjie Ma Research on DC magnetic Bias of Power Transformer − International Workshop on Information and Electronics Engineering (IWIEE), 2012, pp. 452-455

[9] Zhang Bo,Zhao Jie,Zeng Rong,et al.Estimation of DC Current Distribution in AC Power System Caused by HVDC Transmission System in Ground Return Status − Proceedings of the CSEE. 2006, pp.84-88.

[10] Bo Zhang, Jie Zhao, Rong Zeng Numerical Analysis of DC Current Distribution in AC Power System Near HVDC System −  IEEE Transactions on power delivery, DOI: 10.1109/TPWRD.2007.908748,  vol. 23, no. 2, April 2008, pp. 960-965

[11] Jin Enshu, Yu Kuiying,Chai Fangsen Effects of DC magnetic bias on differential protection of transformer − The International Conference on Advanced Power System Automation and Protection, DOI: 10.1109/APAP.2011.6180789, October  2011, pp.2182-2186

[12] Rong Zeng, Zhanqing Yu, Jinliang He Study on Restraining DC Neutral Current of  Transformer During HVDC Monopolar  Operation.− IEEE TRANSACTIONS ON POWER DELIVERY, DOI: 10.1109/TPWRD.2011.2161345, VOL. 26, NO. 4, October 2011,  pp.2785-2791

[13] José Eduardo Telles Villas and Carlos Medeiros Portela Calculation of Electric Field and Potential Distributions Into Soil and Air Media for a Ground Electrode of a HVDC System − IEEE TRANSACTIONS ON POWER DELIVERY, DOI: 10.1109/TPWRD.2003.809741, VOL. 18, NO. 3, JULY 2003,  pp.867-873

[14] Зубов К.Н., Немировский А.Е. Метод расчета заземляющих устройств произвольной конфигурации в неодородных грунтах − Технические науки, Novaifo.ru, №2, 2010. –С.1-7

[15] Лейф Энглунд, Матс Лагерквист, Ребати Дасс Магистрали HVDC в Китае − ABB Power Technologies, no. 4, 2003 С.14-20

[16] НТЦЕ НЕК «Укренерго»  Світовий досвід та економічна ефективність застосування електропередач і вставок постійного струму для забезпечення паралельної роботи несинхронізованих енергосистем Міністерство енергетики та вугільної промисловості України НЕК «Укренерго» Науково-технічний центр електроенергетики, Київ, 2012, –С.1-72



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Copyright (c) 2020 V.V. KYRYK, A.V. BILYK

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Address of the journal editorial office: Editorial office of the the scientific journal "Electrical Engineering and Power Engineering", Zaporizhzhia Polytechnic National University, Zhukovskiy street, 64, Zaporizhzhia, 69063, Ukraine. phone: +38-061-769-82-96 – the Editing and Publishing Department. E-mail: etae@ukr.net; rvv@zp.edu.ua