Application Analysis on Converter Station Grounding Grid as DC Grounding Electrode

doi:10.11985/2017.09.004

Abstract

Abstract:

HVDC without grounding electrode is helpful to achieve bipolar transmission as soon as possible, replacing DC grounding electrode with converter station grounding grid is the most effective measure so far. However, there may be personal and secondary equipment safety problem, transformer DC biasing, heating problem and corrosion problem of the grounding grid. This paper analyses these problems one by one, and puts forward the requirements of DC transmission control strategy, namely, unipolar failure coupling bipolar, unbalanced current control, bipolar synchronization lock and unlock. This paper provides effective reference for HVDC without grounding electrode operation mode, the related control strategies are applied in the Puqiao UHVDC transmission engineering of Chinese southern power grid.

Key words: Convertor station, grounding grid, DC grounding electrode, heating and corrosion of grounding grid

CLC Number:

TM726.1

Huifan Xie,Bo Tan,Zhuohong Pan,Xuefang Tong,Xiaohui Dong. Application Analysis on Converter Station Grounding Grid as DC Grounding Electrode[J]. Journal of Electrical Engineering, 2017, 12(9): 22-27.

Figures/Tables 5

References 14

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k_t	R/Ω
k_t	0.1	0.2	0.3	0.4	0.5
0.10	5.00	2.50	1.67	1.25	1.00
0.15	3.33	1.67	1.11	0.83	0.67
0.20	2.50	1.25	0.83	0.63	0.50

I_g/kA	t_e/s	S_g/mm²
3.0	2.0	64.6
9.0	1.0	128.6
12.0	0.2	76.7
16.0	0.1	72.3