Study on Effect of UHV Power Grid Construction Schemes on Short Circuit Current

Zaihua Li¹, Feng Gao², Qing Wang¹, Shuang Zhang², Hongmei Luo¹, Jian Liang²

¹China Electric Power Research Institute, Beijing, China.
²Ningxia Electric Power Research Institute, Yinchuan, China.

DOI: 10.4236/jpee.2015.34028                

Abstract

The commissioning of Southern Hami-Zhengzhou ±800 kV UHVDC transmission project has important significance to heighten operation reliability, transfer capability and supply electric ability of Henan power grid. However, short circuit currents of 500 kV buses in the Center of Henan are almost close to the operation upper limitation. In order to decrease the short circuit currents effectively, it’s necessary to strengthen the network structure of Center of Henan power grid and calculate short circuit currents. Two schemes of strengthening the network structure of Center of Henan power grid are studied. The calculated values of short circuit currents of some important 500 kV buses in the two schemes are still bigger than excepted. According to the latest Plan of State Grid, Yubei UHV substation and Zhumadian UHV substation located in Henan power grid. The calculated values of short circuit currents of some important 500 kV buses with the commissioning of Yubei UHV and Zhumadian UHV are qualified. So, reasonable network structure with UHV is suitable to heighten transfer capability and supply electric ability of Henan power grid.

Keywords

UHV, UHVDC, Construction Scheme, Short Circuit Current

Conflicts of Interest

The authors declare no conflicts of interest.

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