Energy control method of urban rail super capacitor storage system

Abstract

The invention relates to an energy control method of an urban rail super capacitor storage system. The method comprises the following steps that: a direct-current power supply network voltage Udc and a super capacitor module group terminal voltage Usc are collected respectively and an output branch current Isc of the super capacitor module group is connected within each control period; a charging-discharging threshold calculation module outputs a charging threshold value Uchar and a discharging threshold value Udis in real time based on the super capacitor module group terminal voltage Usc within each control period; and according to a relation between the charging threshold value, the discharging threshold value, and the direct-current power supply network voltage Udc, a current control period of an urban rail super capacitor storage system is determined to be in a charging state, discharging state or a standby state. According to the energy control method provided by the invention, multiple sets of urban rail super capacitor storage systems can work in a coordinated mode and thus the urban rail super capacitor storage systems can absorb brake energy of the train fully and effectively, thereby improving the energy utilization efficiency of the urban rail power supply system. Moreover, fluctuation of the direct-current side voltage of the power supply system can be inhibited.

Description

technical field [0001] The invention relates to the technical field of urban rail transit energy storage and energy saving, in particular to an energy control method for an urban rail supercapacitor energy storage system. Background technique [0002] Urban rail transit has the following characteristics: the distance between stations is short, urban rail trains (referred to as trains for short) start and brake frequently, and regenerative braking is a braking method that can regenerate the kinetic energy of trains into electrical energy and generate controllable power . It effectively reduces the burden and wear of the mechanical brake device, thus becoming the main way of train braking. Regenerative braking can feed back 20% to 60% of electric energy, and has become the main means of saving train energy consumption. The train uses regenerative braking to feed regenerative braking energy back to the catenary. [0003] Since a typical traction substation adopts a diode rect...

AI Technical Summary

Problems solved by technology

[0013] like figure 2 As shown, in the existing energy control method of urban rail supercapacitor energy storage system, the charging threshold and discharging threshold are basically set to be constant or have a small variation range

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