济南特高压变电站500kV主接线方案

Study on 500kV Electrical Main Connections of Ji'nan UHV Substation

交流特高压接入负荷中心区域电网后,在输入区外电力的同时,使受端500kV电网短路电流水平增加较多,如何控制电网短路电流成为一个重要课题。根据济南特高压变电站的具体落点和山东500kV电网结构,通过多方案分析论证,提出了济南特高压变电站500kV主接线采用一变两线单元接线方式。该接线在不改变500kV网架结构的基础上,可有效降低短路电流水平,且能满足电网安全可靠供电要求。

AC ultra-high voltage project connecting to the load center area will increase greatly the short circuit current level of 500 kV grid in the receiving end.It is therefore an important issue to control the short circuit current.According to the location of Jinan ultra-high voltage substation and the structure of Shandong 500 kV grid,the 500 kV main connection of Jinan ultra-high voltage substation is proposed to adopt the unit connection mode of ＂one transformer,two lines＂ based on a multi-scheme comparison.This connection mode,while keeping the 500 kV grid structure,can effectively reduce the short circuit current level and meet the requirements of safety and reliability of power supply.