Capacity configuration scheme of rail transit ground type super-capacitor energy storage system

Abstract

The invention particularly relates to a capacity configuration scheme of a rail transit ground type super-capacitor energy storage system, which belongs to the technical field of urban rail transit regenerative braking energy storage and utilization. Single-train regenerative braking energy is obtained according to the subway train load, the auxiliary power and the braking characteristic curve, multi-train residual regenerative braking energy in the power supply interval of the super-capacitor energy storage system is calculated by combining the train running diagram and the line information,and the capacity of the ground super-capacitor energy storage system is configured; whether the system capacity configuration needs to be adjusted or not is determined by judging whether the remainingregenerative braking energy is completely absorbed or not; and finally, according to the energy-saving efficiency and the investment cost of the configuration scheme, a constraint condition and an optimization objective function are established, and the capacity configuration scheme is adjusted by taking the minimum objective function value as the optimal value so as to realize the optimal configuration of the capacity of the super-capacitor energy storage system.

Description

technical field [0001] The invention relates to the technical field of urban rail transit regenerative braking energy storage and utilization, in particular to a capacity configuration scheme of a rail transit ground-type supercapacitor energy storage system. Background technique [0002] Subway trains have the characteristics of frequent start and stop, high running density, short running distance between stations, etc., and their braking energy is considerable. The braking methods of the train mainly include mechanical braking and regenerative braking. The mechanical braking directly converts the kinetic energy of the train into heat energy and dissipates it in the air through the friction of the brake shoe on the wheel tread. This method wastes the kinetic energy of the train, and at the same time causes problems such as brake shoe wear, dust pollution, and temperature rise in the tunnel. The principle of regenerative braking is that when the train brakes, the motor work...

AI Technical Summary

Problems solved by technology

According to the SOC limit curve, during the charging process, when the SOC value of the super capacitor is close to 0.95, reduce the charging current to prevent overcharging. Similarly, during the discharge process, when the SOC value of the super capacitor is close to the lower limit of 0.25, reduce the discharge current. To prevent over-discharge of the supercapacitor, this method needs to set up a supercapacitor with sufficient capacity, which increases the investment cost

[0006] At present, the supercapacitor capacity allocation method of the design substation is to consider the simultaneous entry of the up and down trains, and calculate the remaining regenerative braking power and regenerative braking energy in the power supply section of the substation as the basis for capacity allocation, without considering the rail transit The system is in a multi-vehicle operating condition, and there is an energy interaction process between vehicles and vehicles, between vehicles and the network, and between vehicles and supercapacitors. Energy interaction will affect the distribution of the remaining regenerative energy on the traction network, and then affect the capacity allocation of the energy storage system

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