特高压接入对天津500 kV电网短路电流影响及限制措施

采用中国电力科学研究院开发的PSD-BPA软件，详细分析了特高压接入对天津500 kV电网的影响。天津南特高压站投产对天津500 kV电网潮流、电压和暂态稳定水平影响不大，但对短路电流影响较大，提高了天津500 kV变电站的短路水平，使得天津南和静海500 kV侧短路电流超标。针对短路电流超标问题提出限制短路电流的3种措施，采用PSD-BPA软件对3种限制措施进行分析，检验3种限制措施的效果。最后，从限制短路电流效果和对电网安全稳定运行的影响2方面对3种限制措施进行比较分析，论述了3种限制措施的优劣性。

Influence of UHV Grid on Short-Circuit Current of Tianjin 500 kV Grid and Its Restrictive Measures

With using the PSD-BPA software developed by China Electric Power Research Institute, this paper studied the influence of UHV grid on Tianjin 500 kV Grid in detail. The operation of UHV substation in Tianjin South has little influence on the current, voltage and transient stability level of Tianjin 500 kV Grid, but has large influence on the short-circuit current, which enhances the short-circuit level of Tianjin 500 kV substation, so as to the short-circuit current of Tianjin South and Jinghai substation exceeding the standard. According to the over-limitation problem of short-circuit current, this paper proposed three measures to limit the short-circuit current, analyzed three restrictive measures with using PSD-BPA software and verified those limiting effect. Finally, this paper compared these three measures from two aspects of the limiting effect for short-circuit current and the impact on the security and stability operation of power grid, and discussed the advantages and disadvantages of these three restrictive measures.