摘要
提出一种用于220kV电网短路电流预测的计算方法。通过设定220kV电厂接入的分布模型,得出接入220kV电网分区的发电机装机容量与该电厂在500kV变电站的220kV母线处注入的短路电流函数关系。指出当500kV变电站220kV母线短路电流和500kV母线短路电流同时达到设备遮断容量时,分区可供电容量为设备允许的最大可供电容量。由此建立了系统最大供电规模与220kV电网短路电流间的关系。与某实际电网情况进行比较,验证了该模型的有效性。对计算结果进行分析所得到的结论为输电网设备选型和次输电网的供电模式选择提供了参考。
A novel method for predicting the short-circuit current of 220 kV sub-transmission network is proposed. First, the function relationship is built between the installed capacity of plant and its contribution to the short-circuit current of 220 kV bus in the 500 kV substation. Then it is pointed out that the sub-transmission network reaches its maximal capacity of power supply when 220 kV bus and 500 kV bus reach the equipment breaking capacity at the same time. The relationship is established between the maximal capacity of power supply of the sub-transmission network and the short-circuit current of 220 kV power grid. The validity of the model proposed is demonstrated by the comparison with an actual power network. Some conclusions obtained from an analysis of the calculation results provide reference to the transmission network equipment selection and the mode of power supply for the sub-transmission network.
出处
《电力系统自动化》
EI
CSCD
北大核心
2007年第16期103-106,共4页
Automation of Electric Power Systems
关键词
短路电流预测
次输电网
设备选型
prediction of short-circuit current
sub-transmission network
equipment selection
