Energy storage system based on series bidirectional converter and its control method

Abstract

The invention discloses an energy storage system based on a series bidirectional converter and a control method thereof, which are mainly applied to energy saving of urban rail transit vehicles. The energy storage system includes an energy storage system grid-side interface circuit, a first bidirectional DC / DC converter, a second bidirectional DC / DC converter, a first supercapacitor bank module, a second supercapacitor bank module, a central controller, The auxiliary controller, the comprehensive display controller, the first supercapacitor group balance controller and the second supercapacitor group balance controller adopt five controllers for coordinated control to realize the control of the entire energy storage system. The invention overcomes the problems of reliable absorption and release control of braking energy and module series connection voltage equalization control when the low-voltage energy storage element is applied to the high-voltage traction network, and efficiently utilizes the braking energy of the vehicle to realize energy saving and emission reduction.

Description

technical field [0001] The invention belongs to the technical field of energy saving of urban rail transit vehicles, and in particular relates to an energy storage system based on a series bidirectional converter and a control method thereof. Background technique [0002] The current regenerative braking schemes of urban rail transit vehicles are mainly divided into three types: dissipative, energy-feeding and energy storage. Dissipative braking consumes regenerative braking energy in the form of heat with resistance, and does not Utilizing the regenerated electric energy does not meet the purpose of saving energy and reducing consumption. The regenerative braking energy absorption method of energy feedback is to feed back energy to the AC grid through the inverter device for use by other electrical equipment, which can reduce the braking resistance of the locomotive, reduce the temperature rise of the subway tunnel and reduce the energy consumption of the ventilation equipm...

AI Technical Summary

Problems solved by technology

[0002] The current regenerative braking schemes of urban rail transit vehicles are mainly divided into three types: dissipative, energy-feeding and energy storage. Dissipative braking consumes regenerative braking energy in the form of heat with resistance, and does not Utilization of regenerated electric energy does not meet the purpose of energy saving and consumption reduction

The regenerative braking energy absorption method of energy feedback is to feed back energy to the AC grid through the inverter device for use by other electrical equipment, which can reduce the braking resistance of the locomotive, reduce the temperature rise of the subway tunnel and reduce the energy consumption of the ventilation equipment, but it needs to be newly built The power supply system with energy feedback function or the transformation of the entire substation power supply system, the cost is relatively high

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