Power distribution network differential protection fault self-synchronization method and system based on reference phasor

The invention provides a power distribution network differential protection fault self-synchronization method and system based on a reference phasor, and the method comprises the steps: enabling two sides of a protected feeder to receive a fault generation signal of the protected feeder respectively, and enabling the time when each side receives the fault generation signal of the protected feeder to serve as the starting time when the side calculates the current phasor; selecting current sampling data at a certain time before the starting moment to calculate the reference phasor of each side; calculating a reference phasor phase angle difference of the same electrical quantity represented by the reference phasors on the two sides; the current phasor is compensated according to the phase angle difference of the reference phasors on the two sides, and errors caused by asynchronous starting moments to calculation of the current phasors on the two sides are eliminated. 本发明提出了基于参考相量的配电网差动保护故障自同步方法及系统，包括：被保护馈线两侧分别接