Research on Preventing False Tripping of Line Overload Protection and Emergency Control Methods
In order to prevent the maloperation of overload protection caused by power flow transfer from leading to cascading tripping,a method quickly identifying whether the overload is caused by power flow transfer and an emergency control measure for line overload are proposed.The line power after the power flow transfer is calculated the DC power flow method,and the power flow transfer difference and impedance angle are compared to determine whether the overload is caused by power flow transfer.If it is the protection is locked.Then,according to the power sensitivity and the principle of concentric relaxation,the group of control nodes with the best load reduction effect is determined,and the line overload is quickly eliminated by using the method of reverse equal adjustment,which effectively reduces the amount of computation.The cor-rectness and superiority of the method are verified in the IEEE39 bus system.
line overloadpower flow transfer differenceimpedance anglepower sensitivityconcentric relaxation
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