Black-start sending-out line head end maximum boosting limiting device and method

The invention discloses a black-start sending-out line head end maximum boosting limiting device which comprises a processor module, a communication module and an industrial personal computer. The device inputs a transmission shift coefficient of a black-start sending-out line, a power supply reactance influence angle, a power transmission line distance and a shunt reactor angle parameter througha serial port interface of an industrial personal computer, and transmits the parameters to a processor module through a communication module, and the processor module calculates a voltage rise multiple of the tail end of the sending-out line than the head end, and thevoltage rise multiple is transmitted back to theserial port interface of an industrial personal computer for display. The industrial personal computer determines the highest control voltage during black start of the head end of the sending-out line according to a calculation result and the highest allowable operation voltage of the tail end of the sendin