Longitudinal differential protection method based on synchronous sampling point vector compensation principle

The invention discloses a longitudinal differential protection method based on the synchronous sampling point vector compensation principle, which is characterized by comprising the following steps: calculating the current compensation coefficient * of the current side in real time and calculating the differential current and the braking current of the current side according to the following formulas when the synchronous calculation condition is met under the condition that the normal communication channel is normal: Id is equal to the absolute value of the difference of *1 and **2, and Ir isequal to the absolute value of the sum of *1 and **2, and carrying out the differential calculation with the traditional differential protection calculation method. The longitudinal differential protection method based on the synchronous sampling point vector compensation principle overcome the defect that the dependence of the longitudinal protection in a digital station on a GPS clock, a high-precision clock or a high-p