Power coordinated control method of AC-DC (alternating current-direct current) locomotive under working condition of low system voltage

Abstract

The invention discloses a power coordinated control method of an AC-DC (alternating current-direct current) locomotive under working condition of a low system voltage. The method comprises the following steps that: when the detected system voltage is not lower than a limit value, limited operation is not carried out on a motor current and load shedding treatment is not carried out on the locomotive; when the detected system voltage is lower than the limit value, current reducing operation is carried out on the motor current according to a certain rate, wherein a current reducing amplitude is directly proportional to the reduced amplitude of the system voltage, the lower system voltage is, the larger load shedding amplitude is obtained, and the load shedding amplitude is changed with the system voltage; and a speed of the locomotive is monitored simultaneously in the process for detecting the change of the system voltage, wherein when the speed of the locomotive is close to the limit value, the current reducing operation is stopped, and if the detected system voltage is reduced continuously, the motor maintains the operation at the present current, and when the detected system voltage is recovered to some degree, recovery operation is conducted on the motor current according to the certain rate till a current value is needed at a certain slope. According to the method, the technical problem of the existing lines, especially the lines with long heavy grade and insufficient power of a power system, can be solved, so that the safe and stable operation of the locomotive can be ensured.

Description

technical field [0001] The invention relates to a locomotive control method, in particular to a power coordination control method for an AC-straight locomotive under low grid voltage conditions. Background technique [0002] In recent years, with the rapid development of the national economy, the transportation tasks undertaken by electrified railways have continued to increase. However, due to the limited capacity of the power grid on some existing lines, especially the sections with long ramps, the catenary voltage has been continuously reduced. Each locomotive The allocated energy is limited, leading to a series of problems such as burning out of auxiliary equipment of electric locomotives and being forced to stop, which seriously affects the normal transportation order. The best way to solve this problem is to increase the system capacity of the traction substation, but this will involve the coordination of the power system. It is necessary to add high-voltage substation...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a power coordination control method for AC locomotives under low network voltage conditions, which solves the problem of ensuring the safe and stable operation of locomotives on existing lines, especially on lines with long slopes and insufficient grid power. technical problem

Images