Study on Improvement of Main Protection for Converter Ground Faults for Some HVDC Projects in China

• Autorzy: Deng L. , Dongyun S. , Yinhong L.

Warianty tytułu

PL

Badanie ulepszonego głównego systemu ochrony w zwarciach doziemnych w układach HVDC w Chinach

• Języki publikacji: EN

Abstrakty

EN

The dc differential protection with one stage needs to react all inverter ground faults under various fault conditions in some HVDC projects in China. The protection setting values of action value and delay time are set low and short, respectively, in order to satisfy the protection speedy and sensitivity, which reduces the protection reliability and induces protection mal-operation. Based on the relationship between fault influence level and protection action quantity, this paper improved the dc differential protection from one stage to two stages, in wihich high-value and low-value stages are used to guarantee the protection speedy and the protection sensitivity and reliability, respectively. Then, by using analysis results from the characteristics of inverter ground fault and the influence of ground resistance, this paper obtained the worst fault conditions, which helped setting calculation of the two-stage protection improved. The PSCAD/EMTDC simulation model of Guiguang II HVDC Project was established and used to verify the improvement on the main protection for converter ground faults. The simulation results showed that the improvement was correct and reasonable, and can be helpful to resolve the contradiction among the speedy, sensitivity and reliability of protection performance.

PL

W artykule przedstawiono ulepszony sposób ochrony różnicowoprądowej dla układów HVDC. W rozwiązaniu zastosowano dwa stopnie ochrony, wysoki i niski, w celu zapewnienia odpowiedniej szybkości, czułości i odporności układu. Na podstawie charakterystyk zwarć doziemnych w falownikach oraz wpływu rezystancji uziemienia, wyznaczono najgorszy przypadek awarii. Wykonano badania symulacyjne, proponowanego rozwiązania, które potwierdziły skuteczność działania.

Słowa kluczowe

EN

High Voltage Direct Current; ground resistance; DC differential protection

PL

HVDC; zwarcie doziemne; ochrona różnicowa DC; rezystancja uziemienia

• Wydawca: Wydawnictwo SIGMA-NOT
• Czasopismo: Przegląd Elektrotechniczny
• Rocznik: 2013
• Tom: R. 89, nr 5
• Strony: 128--134
• Opis fizyczny: Bibliogr. 11 poz., rys., tab.

Twórcy

autor

Deng L.

• State Key Laboratory of Advanced Electromagnetic Engineering and Technology (Huazhong University of Science and Technology)

autor

Dongyun S.

• State Key Laboratory of Advanced Electromagnetic Engineering and Technology (Huazhong University of Science and Technology)

autor

Yinhong L.

• State Key Laboratory of Advanced Electromagnetic Engineering and Technology (Huazhong University of Science and Technology)

Bibliografia

• [1] M. Bahrman, B. Johnson. The ABCs of HVDC transmission technologies, IEEE Power Energy Magazine, 5 (2007), No. 2, 32-44.
• [2] P.M. Aderson. Power System Protection (Wiley-IEEE Press, USA 1999).
• [3] Zhu Taoxi, Xia Yong, He Jie, et al. Analysis on the characteristics of grounding fault at inverter transformer valve Side, Automation of Electric Power Systems, 35 (2011), No. 1, 96-99. (in Chinese)
• [4] Cheng Jingzhou, Xu Zheng. Analysis of AC faults in converter station and characteristics of its relay protection, Proceedings of the CSEE, 31 (2011), No. 22, 88-95. (in Chinese)
• [5] Darwish, H.A., Taalab, A.-M.I., Rahman, M.A.. Performance of HVDC converter protection during internal faults, IEEE Power Engineering Society General Meeting, (1) 2006, 1-7.
• [6] Darwish, H.A., Rahman, M.A., Taalab, A.I., Shaaban, H. Overcurrent relay with novel characteristics for HVDC converter protection, Canadian Conference on Electrical and Computer Engineering, 2 (1995), 664-667.
• [7] Kato, Y., Watanabe, A., Konishi, H., et al. Neutral line protection systems for HVDC transmission, IEEE transactions on Power Delivery, 1 (1986), No. 3, 326-331.
• [8] Wang Junsheng, Zhu Bin. Analysis of fault clearing actions under single phase to ground fault of lines connecting transformer and inverter valve, Automation of Electric Power Systems, 34 (2010), No. 23, 119-123. (in Chinese)
• [9] Liu Yang, LI Xiaohua, Cai Zexiang. Location of HVDC converter grounding fault, Automation of Electric Power System, 34 (2010), No. 8, 86-91. (in Chinese)
• [10] Zhao, Z.Y. Modeling HVDC control and protection system based on PSCAD for optimum engineering dynamic performance design, Electric Utility Deregulation and Restructuring and Power Technologies, (1) 2008, 1727-1731.
• [11] Huang Libin, Guo Qi, Han Weiqiang, et al. RTDS Simulation and analysis on anti-jamming measures of 87 DCM DC protection during switch operation interfering in AC yard, Southern Power System Technology, 2 (2008), No. 1, 22-26. (in Chinese)