应用于多通道不同时解列的快速解列判据

Fast Tripping Criterion Used in Multi-Channel Tripping

通过大量仿真计算发现,现有快速解列装置在处理多失步通道互联电网问题时,存在各通道不同时解列的情况,容易诱发临近未失步的线路在解列进程中发生失步振荡。为避免这种状况的发生,在支路势能函数的基础上,推导出判断单条线路在系统失步振荡时的稳定度函数,并利用此函数给现有快速解列判据增加一个能够统筹各通道解列顺序的附加判据,这种改进能有效避免原快速解列判据无法彻底消除系统振荡的情况,最后用实际算例验证改进快速解列判据的优越性。

A large number of simulation calculations show that the existing fast tripping systems have different channel tripping in different time when dealing with multi-channel power grid.In this case,out-of-step oscillation may be induced in the fragile line closing to out-of-step in the process of tripping.In order to avoid this case,an additional criterion is proposed,which is based on the stability function of a single line in out-of-step system.At the same time,the stability function of a single line in out-of-step system is based on the line transient potential energy function.In all,such improvement of criterion can effectively avoid the case that the original fast tripping criterion can＇t completely eliminate the system oscillations.Finally,a case simulation is conducted to verify the effectiveness of the improved fast tripping criterion.