控制短路电流提高220 kV分区电网可供电容量

Improving power supply capacity of Shanghai 220 kV district gird by controlling short circuit current

根据上海220kV电网分区运行的情况,分析220kV分区电网短路容量的特点,指出当前短路容量已不能满足运行的要求,并提出相应的改进措施。详细分析、比较了增加500kV与220kV短路点之间阻抗、提高发电机暂态阻抗等措施对控制220kV短路电流、提高可用容量的作用,并明确了220kV电网控制短路电流不宜采用电抗器。

Based upon the operating condition of the Shanghai 220 kV grid district, the features of the short circuit capacity of the 220 kV district grid are analyzed. It is pointed out that the present short circuit capacity cannot meet the operation requirements and at the same time the corresponding remedy measures are suggested. In the detailed analysis, the effects of the various adopted measures upon the control of the 220 kV short circuit current and the increase of the available power supply are compared. The measures compared include for example the increase of impedance between the 500 kV and 220 kV short circuit points and the enhancement of the transient impedance of the generators. Finally it is verified that the reactors cannot be used in the control of the 220.kV grid short circuit current.