Modular super-capacitor energy storage system energy balance control method based on balanced bus

Abstract

The invention provides a modular super-capacitor energy storage system energy balance control method based on a balanced bus, and belongs to the technical field of super-capacitor module energy balance control in a super-capacitor energy storage system. The modular super-capacitor energy balance control method comprises the following steps that a system common voltage outer ring is established; asub-module independent current inner ring is established; a SOC value of a module with highest energy in the system is selected as reference through the balanced bus; the sub-module current inner ringis given for adjustment by utilizing SOC reference and a own SOC value of a module; and a system current value and the adjusted current reference are used as input of a current regulator, a chargingand discharging operation status of a sub-module is controlled, and energy dynamic balance control between energy storage system groups is realized. The modular super-capacitor energy balance controlmethod has the advantages that the structure is simple, the modular super-capacitor energy balance control method is suitable for a multi-sub-module cascade system, and the modular capability and thefault-tolerant control ability of the system are improved.

Description

technical field [0001] The invention relates to an energy balance control method of a modularized supercapacitor energy storage system based on a balanced bus, and belongs to the technical field of energy balance control of supercapacitor modules in the supercapacitor energy storage system. Background technique [0002] As my country's urbanization process continues to accelerate, urban rail transit has developed rapidly. As an auxiliary power supply device to improve energy utilization efficiency in urban rail transit power supply system, supercapacitor energy storage system has received extensive attention. The withstand voltage of the supercapacitor module in the energy storage system is low, and it is necessary to connect multiple modules in series to adapt to high-voltage applications. However, due to the difference in parameters between modules and other reasons, the energy will be unevenly distributed among the modules. During long-term operation, supercapacitor modu...

AI Technical Summary

Problems solved by technology

[0003] (1) The balanced method leads to a reduction in the modularity of the energy storage system, and does not use the system to expand applications;

[0004] (2) The overall control of the energy storage system is complicated and the reliability of the system is reduced;

[0005] (3) The cost of energy storage system is too high

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