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A cascaded multi-level supercapacitor energy storage system and discharge mode control method

A supercapacitor, cascaded multi-level technology, applied in the field of energy storage, can solve problems such as poor performance

Inactive Publication Date: 2016-01-27
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method requires multiple charge and discharge cycles to achieve energy balance, and it is not effective for DC / DC conversion mode and island inverter mode.

Method used

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  • A cascaded multi-level supercapacitor energy storage system and discharge mode control method
  • A cascaded multi-level supercapacitor energy storage system and discharge mode control method
  • A cascaded multi-level supercapacitor energy storage system and discharge mode control method

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Embodiment Construction

[0029] The present invention will be further explained below in conjunction with the accompanying drawings.

[0030] Such as figure 1 As shown, a cascaded multi-level supercapacitor energy storage system, the system includes at least two half-bridge converters 5, supercapacitor energy storage units 4 consistent with the number of half-bridge converters 5, inductor 1, LC series circuit 2. Filter capacitor 3 , voltage detection unit 7 and controller 6 . The input end of each half-bridge converter 5 is connected in parallel with a supercapacitor energy storage unit 4 , and the two terminals of the output end of each half-bridge converter 5 are respectively connected in series with the output terminals of the adjacent cascaded half-bridge converter 5 . The positive output terminal of the first half-bridge converter 5 is connected to the positive pole of the common DC bus through the inductor 1 , and the negative output terminal of the last half-bridge converter 5 is connected to ...

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Abstract

The invention discloses a cascading multi-level super capacitor energy storage system and a discharge mode control method. The system comprises at least two half-bridge converters, super capacitor energy storage units, an LC series circuit, a voltage detection unit and a controller, wherein the input end of each half-bridge converter is connected with one super capacitor energy storage unit in parallel, the half-bridge converters are connected between the anode and the cathode of a common direct current bus in a cascading manner, the LC series circuit is connected between the positive terminal of the output end of the first half-bridge converter and the negative terminal of the output end of the last half-bridge converter in parallel, the voltage detection unit is used for transmitting the end voltage of anode of the common direct current bus and end voltages of super capacitors to the controller, the controller is used for controlling each half-bridge converter to output a direct current power component and output / input a high-frequency alternating current component, the direct current power components are supplied to a load through the common direct current bus, and the high-frequency alternating current components flow between the cascading half-bridge converters and the LC series circuit for balancing energy of the super capacitors.

Description

technical field [0001] The invention relates to the technical field of energy storage, in particular to a cascaded multilevel supercapacitor energy storage system and a discharge mode control method. Background technique [0002] Supercapacitor is a new type of energy storage device with high energy density. It has the advantages of high power density of conventional capacitors and high specific energy of rechargeable batteries. It can be charged and discharged quickly and has a long life. It is used in electric vehicles, emergency power supplies and power automation equipment It has a good application prospect. [0003] The voltage of a single supercapacitor is low, generally not exceeding 2.7V. In order to meet the needs of the voltage level, a plurality of single supercapacitors are usually connected in series to form a supercapacitor energy storage unit, and then connected in parallel with a power conversion circuit to form an energy storage unit. system to obtain a sta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J7/00
Inventor 蒋玮胡仁杰曹戈黄慧春
Owner SOUTHEAST UNIV
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