• 能源互联网 •

### 异步联网条件下内蒙古电网的短路电流问题

1. 1.内蒙古电力科学研究院，内蒙古自治区 呼和浩特市 010020;
2.中国电力科学研究院有限公司，北京市 海淀区 100192
• 收稿日期:2019-12-10 出版日期:2020-08-10 发布日期:2020-08-07
• 作者简介:李丹丹（1979），女，硕士，高级工程师，主要研究方向为电力系统分析，E-mail：nmlidandan@163.com;武海燕（1991），女，硕士，助理工程师，主要研究方向为电力系统分析，E-mail：w18700944785@163.com;张爱军（1972），男，硕士，高级工程师，主要研究方向为电力系统计算分析，E-mail：1768013046@qq.com;陈湘(1983)，男，硕士，通信作者，主要从事大电网运行与控制方面的研究工作，E-mail： 3633594@qq.com。

### Short-Circuit Current of Inner Mongolia Power Grid with Asynchronous Interconnection Project

LI Dandan1, WU Haiyan1, ZHANG Aijun1, CHEN Xiang2, LIU Shichuan1, LIU Huiqiang1

1. 1. Inner Mongolia Electric Power Research Institute, Hohhot 010020, Inner Mongolia, China;
2. China Electric Power Research Institute, Haidian District, Beijing 100192, China
• Received:2019-12-10 Online:2020-08-10 Published:2020-08-07

Abstract: With the development of the Inner Mongolia power grid, short-circuit current exceeding the standard has become one of the most prominent problems in recent years. The asynchronous interconnection model of back-to-back HVDC transmission system was established with the planned Inner Mongolia 500kV power grid in 2023 as the research target. Based on the model, PSD-SCCP was uesed to scan the entire network for three-phase and single-phase short-circuit currents on 220 and 500kV buses before and after the Inner Mongolia Power Grid Asynchronous Networking Project was connected. It can be concluded that after the asynchronous network project was put into operation, it could reduce the overall short-circuit current level of the Inner Mongolia power grid to a certain extent, especially the effect of limiting the short-circuit current level of the bus near the converter station was very obvious. However, for areas that is far from the converter station, the restriction effect was not obvious. The effectiveness and limitations of asynchronous networking schemes in limiting short-circuit current were verified. Therefore, for the short-circuit current exceeding the standard of the Inner Mongolia power grid in 2023, a combination of asynchronous networking solutions and other traditional measures to limit short-circuit current can be adopted to deal with it.

• TM72