Limiting Short-Circuit Current of Southern Qinghai Power Grid

Xu FU; Xiaofei WANG; Fuchun LI; Pengyu ZHANG

doi:10.16513/j.2096-2185.DE.1901120

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Distributed Energy ›› 2020, Vol. 5 ›› Issue (1) : 65-70. DOI: 10.16513/j.2096-2185.DE.1901120

Application Technology

Limiting Short-Circuit Current of Southern Qinghai Power Grid

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Abstract

With the operation of UHV DC in the southern part of Qinghai province, the short-circuit current of the UHV DC station and converter station has become a major problem of the safe operation of power systems. This paper analyzes the development trend and cause of short-circuit current in the southern part of Qinghai province power grid. On this basis, the measures to limit the short-circuit current are put forward. The research results show: (1) Only the addition of resistance does not limit short-circuit current of Tara 750 kV bus, and Tara 750 kV station does not has position to install resistance. (2) Though Tara 750 kV outlets out of string can reduce the short-circuit current, it can only be used as an auxiliary measure in the grid operation. (3) The 750 kV line reconnection scheme also has problems such as line crossover and poor reliability of the hydropower station group. Tara 750 kV is recommended to upgrade 750 kV switch to avoid cross-over crossing of 750 kV lines and ensure reliable delivery of hydropower station.

Key words

short circuit current limitation / series reactor / Qinghai power grid / line out of string

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Xu FU , Xiaofei WANG , Fuchun LI , et al. Limiting Short-Circuit Current of Southern Qinghai Power Grid[J]. Distributed Energy Resources. 2020, 5(1): 65-70 https://doi.org/10.16513/j.2096-2185.DE.1901120

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