Voltage equilibrium control method and system

Abstract

The invention provides a voltage equilibrium control method and system which are applied to an energy storing device composed of a plurality of unit modules. Each unit module comprises at least two single supercapacitors, the first current working voltage of each single supercapacitor and the second current working voltage of each unit module are monitored and compared with corresponding standard working voltages, so that when it is determined that the first current working voltage is smaller than the first standard working voltage, a charging circuit of a one-way DC / DC module connected with the corresponding single supercapacitor in parallel is controlled to work so as to charge the corresponding single supercapacitor; otherwise, a discharging circuit connected with the corresponding single supercapacitor in parallel is controlled to work so as to discharge the corresponding single supercapacitor; operation is convenient, flexible and high in reliability, the single supercapacitors in the energy storing device are prevented from being permanently damaged due to overcharge and over discharge, and safe and reliable operation of an energy storing type urban rail transit vehicle is guaranteed.

Description

technical field [0001] The present invention mainly relates to the control field of supercapacitors, and more specifically relates to a voltage equalization control method and system. Background technique [0002] At present, supercapacitors are usually used as the sole power source in energy storage urban rail transit vehicles, without the need to set up power grids to destroy the urban landscape, and meet the dual requirements of modern urban transportation and energy conservation and environmental protection. In practical applications, since the working voltage of a single supercapacitor is not high, in order to meet the energy storage capacity and voltage level requirements of energy storage urban rail transit vehicles, it is usually necessary to form a supercapacitor bank by connecting multiple supercapacitors in series. As the energy storage device of the energy storage type urban rail transit vehicle, the normal running of the energy storage type urban rail transit ve...

AI Technical Summary

Problems solved by technology

[0004] In view of this, the present invention provides a voltage equalization control method and system, which solves the problem of voltage imbalance between individual supercapacitors in the prior art, and even causes permanent damage to supercapacitors due to overcharging or overdischarging , so that the energy storage device fails and affects the technical problems of energy storage urban rail transit vehicles running normally

Images